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Do Riders At The Tour de France Change Their Tyres Every Day | GCN Tech Clinic AskGCNTech

by GCN Tech

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Published 7 Jul 2021

Do pro cyclists at the Tour de France swap their tyres every day? When should you replace tubeless rim tape? Is it OK to use automotive brake cleaner on your bike? All of these questions, and more, answered in this week's GCN Tech Clinic! Subscribe to GCN+ for cycling as you have never seen it before! Live racing, shows & cycling adventure films: https://gcn.eu/plus Subscribe: http://gcntech.co/subscribetogcntech The GCN Shop: https://gcn.eu/62X #Cycling #GCN #GCNTech #RoadBike Do you have a burning tech question? Leave it in the comments below using the hashtag #AskGCNTech and we'll answer it in a future Tech Clinic! 00:00 Intro 00:23 Is it safe to use a drill to remove through axles? 01:11 When you should replace tubeless rim tape? 02:05 Carbon frame with alloy wheels or vice versa? 02:55 Do grand tour riders change their tyres every stage? 04:05 How do you set up rim brake pads with long drop callipers? 05:14 Is car brake cleaner ok on bikes? 05:34 What's the correlation between HR and power? 07:32 How much torque should you use on saddle rails? 08:29 Do you need to swap both chainrings at the same time? 10:13 When will we see a flying bicycle? If you enjoyed this video, make sure to give it a thumbs up and share it with your friends. 👍 Watch more on GCN Tech... 📹 https://gcn.eu/62x Music - licensed by Epidemic Sound: Photos: © Velo Collection (TDW) / Getty Images & © Bettiniphoto / http://www.bettiniphoto.net/ Brought to you by the world’s biggest cycling channel, the Global Cycling Network (GCN), GCN Tech is the only channel you need for all things bike tech – past, present and future. Simply put, we’re obsessed with tech: we seek out and showcase the best in bikes, components, tech, accessories, upgrades and more from races and events, tech shows and product launches across the globe to bring you the best in road bike technology. We’ve also got great maintenance videos to help you get the most from your bike; pro-bike tours from all the biggest races; special features and the weekly GCN Tech Show. We also take a deeper look into the future of cycling, apps, smart tech and virtual riding. Join us on the channel and the GCN App to submit your content, vote on the latest tech and keep abreast of exciting new trends. GCN Japan: https://gcn.eu/subscribe-gcn-japan GCN Italia: https://gcn.eu/GCN-Italia Suscribirse a GCN en Español: http://gcn.eu/Suscribirse Facebook - http://gcntech.co/gcntechfb Instagram - http://gcntech.co/gcntechinsta Twitter - http://gcntech.co/gcntechtweet Zwift: https://gcn.eu/Zwift

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Comments - 224

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@cyrusalthor85833 years ago Pro tip: if you' re checking your tyres fordon' t put your face too close to the tyre. If you' re teasing a bit of glass out with a tool like a pair of tweezers, it can easily flick up towards you. Better yet, wear eye protection when doing this. ...Expand 10
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@vincentolliver66743 years ago The most comfortable saddles are made by tramadol. 18
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@gerrymcbride64293 years ago Unless stated otherwise, torque settings are specified for clean unlubricated threads. Lubricating the thread and applying the specified torque will overstress the fastener and may cause failure. 4
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@myrimidon2023 years ago Good to see ollie droppingsome knowledge on pronunciation there. 21
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@daniel.36033 years ago A less good shift
-ollie bridgewood, 2021 . 18
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@alphaniner37703 years ago I would not recommend to race on brand new tires. For good grip you need tires that got ' roughed up' a little bit. 8
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@MosesPlays3 years ago As a new bicycle mechanic, that is just now in the learning process of all the works of a mechanic, i must say i absolotely love alex vast knowledge and teachings.
thank you!
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@Slicer11803 years ago Regarding the chainring compatabiliy question. I' ve tried a 53-34 and they worked pretty fine. 2
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@iberiksoderblom3 years ago " wheelchange!
f1 style and ollie alone: d.
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@sidshel44283 years ago The 6th question about proper torque. I did see a gcn tech with simon who says use 10 percent less torque that is unless like alex says it slips. You don' t . ...Expand 1
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@lukasilverman60713 years ago , Hi Alex/Ollie I hope you are doing well, I just bought new clipless pedals and my bike squeaks everytime I pedal, this problem only started once I put these new pedals on, what could this be and how can I fix it? Thanks in advance! .. ...Expand 2
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@gravelexplorer24373 years ago Hi Ollie and Alex,
I recently bought a Canyon Grizl Slx as a Do-it-all bike. It comes with Dt Swiss GRC Wheels, which have an inner rim width of 24mm. I wanted to put on 28mm tires, but Dt swiss recommended at least 32mm, I thought, thats because they are hookless. After I saw your video about the new Zipp Wheels I wonder why these should be safe with 25mm tires, having a 23mm inner rim width, while the GRC are not. How different can the construction of the rims be, since they are both TSS and irw just differs by 1mm? Or do DT Swiss just recommend wider tires to be on the safe side? By the way: I intend to use inner tubes, to make it easier to switch tires. Cant afford another set of wheels for the road for now.
Thanks a lot .. ...Expand 1
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@manfredmuench26573 years ago I think the point of the question at was missed. He was asking if you should always go to the maximum torque given or can get away with less. I have just mounted a new pair of CF clip-on aero bars with 2NM and they are solid - why go any higher? If they move after a while I can always increase it. .. ...Expand 2
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@michaelodell-vp9xtlast year I have a road bike with 700 c 32 tires with presta valve tubes in them. Every day i' m airing up my rear tire. I took the tube out and aired it up . ...Expand
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@DoNuT_19853 years ago Ad the gc rider tyre change questions: i have vittorias on that are pretty worn after just 2k, so very likely that grippy race tyres have to be swapped out halfway through the tour.
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@nwhiting843 years ago I' d like to weigh in on changing the 52/36 to 52/34. I' ve been running 52/34 for about 5 years now with shimano ultegra mechanical with no noticeable decrease in smoothness regarding front mech gear changes. 2
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@soulboken46703 years ago I do think that you need to change your tubeless rim tape every season if you intend to clean off the dried/wet sealant. 1
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@lufo53 years ago As a gravel enthusiast i do not agree with th answare. If you buy a good carbon frame is strong enough for bikepaking and all the hardest thing you can carbon frame improve dramatically the ride quality and reduce vibrations and this is a must on gravel.
carbon wheels would suffer a lot on rocks and holes you find off road. It is really easy to scratch or damage them.
on a gravel you need more than one pair of rims: best is 29" with hard surface tyres, 27. 5" with larger mixed surface tyres, 28" road rims and tyres. So having an expensive set of rims is a no clue. ...Expand
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@jeremymaclean35353 years ago Hi Ollie and Alex, I have a Rotor4 bolt spider and have rounded on of the chainring bolts. Amateur hour. It isn't loose though so have left it for the time being. I have tried the rubber band over the Allen key and hasn't worked. Do I drill it out, never done this or get the bikeshop to do it or just leave it. Thanks .. ...Expand
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@saurinsavla93103 years ago Hi, my question is not based on bike tech but Are early attacks on a Tour de France stage pre-planned? 12
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@PianoCoverss3 years ago Hello, hope you're all well.. Can a new road bike with through axles fit on a turbotrainer where the rear wheel spins? 2
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@trykpaa3 years ago What' s the difference in rolling resistance on new vs old tires. That flat middle must have negative effect. Maybe something to investigate?
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@suncuevas12383 years ago Mark cavendish is 36 years old and have this resurgence in his career. What did he do?
will alex paton of gcn at 31 years of age do something like mark cavendish and revive his old racing glory? 11
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@KingfisherSG3 years ago There are offset brake shoe holders available in the market to solve jareds problem. 4
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@averageuncle81763 years ago What can i do if the front brake caliper is stuck, i have drained the oil and the pistons was still stuck. I managed to push with brutal force, i replaced . ...Expand
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@TheMediocreCyclist3 years ago I'm currently upgrading an older bike. I want to convert it from flat bars to drop bars with STI shifters, however it currently has V brakes on it. I've read that STI shifters don't work properly with V brakes. Is there anyway I can sort this out, as the frame doesn't have the ability to fit caliper brakes. .. ...Expand
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@dzrdza3 years ago I' m not entirely sold on tubeless, but i like the way tubeless wheels are going. I would like to purchase a set of hookless wheels, but i plan on sticking . ...Expand
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@jorrelcalzo93483 years ago Hi gcn! Will we ever get a behind the scenes video on the filming and producing of a gcn video? Maybe a tour of the gcn mega base as well?? 2
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@philipcooper82973 years ago Do bicycle tyres have a speed index/rating, meaning the maximum design speed? I often exceed 75 km/h on fast descent, so do I dare to push for more or are the tyres a limiting factor that I should keep my eye on? I use Continental Ultra Sport III tyres. .. ...Expand 2
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@nature-4-all3 years ago
The centre studs on my Schwalbe G-one Bite tyres wear down faster than the outer studs. Should I get new tyres once the centre studs wear down to the tyre rubber or sooner? .. ...Expand
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@keithfurrow58993 years ago Don' t forget the wright brothers made bicycles and airplanes. It might be time to revisit a flying bicycle. 1
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@derekmccord37983 years ago Will there ever be a tyre war in cycling like they have in auto racing? Different compounds for different weather or road conditions? 14
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@barmouthbridge87723 years ago Watch how the manufacturers go back to threaded bottom brackets. And eventually rim brakes become more prevalent as they' ll be touted as lighter. Nothing wrong with 28mm tyres. We can keep them for general riding. 1
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@jasonrichardson44153 years ago Hi Alex and Ollie, me and my girlfriend both run a different size rear cassette (shimano 11spd 11-30 and 11spd 11-32). Can we use the same rear cassette on a turbo trainer and it still work for both bikes? .. ...Expand
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@sbong143 years ago How do you identify if a wheel set will be compatible with a Shimano 12 speed cassette once the new Dura-Ace is released? I'm looking to upgrade to Zipp's 303 firecrest but dont want to risk its obsolete in no time. .. ...Expand 2
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@lovenottheworld57233 years ago I' ve got some litepro brake pad extenders from aliexpress for some brakes where the arms were too short. I got a cheap deal on a pair so the price . ...Expand
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@Rikcey3 years ago Be careful with automotive brake cleaner though, some do actually leave some residue thats due to be burned off anyway, which, us cyclists, wont. 8
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@jasonh14853 years ago WARNING: max torques are normally set for dry threads. If you lubricate the bolt it reduces friction and results in a higher clamping force at the sam e torque setting - you will need to reduce the max torque setting by at least 25% when lubricating the threads.
Torque settings are a maximum rating. With carbon frames and components you should tighten just enough to secure the fixing but not exceed the max torque. Carbon assembly paste is a must for certain fixings such as seat posts, as it increases friction between carbon parts reducing the need to clamp at higher torques.
Reference . Sorry Alex, had to get that off my chest. You dont want to be responsible for broken bikes (;-) .. ...Expand
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@bikearoundph3 years ago How often should i change bartapes? Ive had my stock bartapes for 6 months now and i can feel the road vibration more. Would double wrapping it work? Thanks.
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@howarddcruz50463 years ago .hi this is Howard from Kolkata, India. thanks so much for bringing us so much of great Information and content.my question is nothing to do with tech it's just that I am curious as to your opinion - do you think the only guy who comes close to being as good as Pogacar in GC category is not in the TDF (Egan Bernal). thanks once again. .. ...Expand
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@fleurdelispens3 years ago do pros ever add weight to their bikes as a form of training? I'm just wondering if all my cycling with my 5lbs of locks is making me a stronger rider .. ...Expand 7
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@petermarshall77753 years ago There used to be a step-down canter bolt for side pull brakes. If shimano don' t produce it wold not be difficult to make up yourself.
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@JAllenPriest3 years ago I have a question about power and gears. I have a ride that I ride very often as a way to measure my performance improvements. My question is, if I ride this course at, say 250 Watts, in a higher average gear and then ride it at the same power but at a lower average gear, should I expect to see the same average speed? Are there inefficiencies at different gear rations which would affect the average speed on the ride? .. ...Expand
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@grizzlemydog13 years ago Hi Alex and Ollie. I've got 10 year old shimano 105 on my specialized tarmac, would it make a big enough noticable gain by upgrading to current 105/ultegra to justify upgrading. Or would it be better to up-grade to a new bike that will have the components on. Thanks in advance. .. ...Expand
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@TkTraXX3 years ago hi maybe this is a retro tech question but how bad were bunch racing crashes before clipless pedals were used in the peloton? Ive fallen off on my own being strapped in and was quite embarrassing trying to get up at the traffic lights and can only imagine what would be like to come down in a group that are all tied on to the bikes. ..cheers .. ...Expand
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@johnevans63993 years ago Question: have i got a screw loose because i watch and enjoy these vids but i don' t own a bike and never will due to crap health? 6
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@shyamfootprints9723 years ago Hi alex & ollie: love your show! I own a decathlon rc 120 entry level road bike purchased 6 months ago and i can output 145w average over a 90 minute $1500 bike for the same ride, as compared to my $500 decathlon bike?. ...Expand
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@user-yj8wh9xt8n3 years ago i had an alloy frame road bike with carbon fork and i put telfon grease on headset bearing. Is it the telfon grease will harm my carbon fork? ..
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@imacomputer12343 years ago At over 3400km i guarantee they' re changing the rear tire at least once, probably twice just from wear. They probably replace at the first sign of damage too, why risk a flat? 2
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@lukasilverman60713 years ago , Hi Alex/Ollie I hope your doing well , I recently bought new rims that are tubeless ready however the tires I have don't say if they are tubeless ready, can I run a tubeless setup without tubeless tyres, will it work? Would there be any disadvantgaes to running a tubeless ready tyre? Thanks so much in advance! .. ...Expand 3
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@rommelreyes22093 years ago what is the cheapest bike in the TDF 2021? 17
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@nemeanf273 years ago Hi Alex and co, now knowing that the axs chain is not the most efficient, is it compatible to use the eagle chain on a 2x axs groupset?
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@pablolopez5843 years ago Hi Ollie, Alex. My bike has post-mount brake disc calipers & 6-bolt wheels. Would center lock wheels fit? Thank you!
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@weijingburr23923 years ago If using automotive brake cleaner on your bike it' d be advisable to look at thevariety as well as the standard stuff. Both are very high strength solvents and one or the other may interact with either the aluminums, stainless steels, variousor the resins in the carbon fiber. Reading the label and testing is advisable, lest one should dissolve their pride and joy. ...Expand
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@BeerMatt963 years ago Power is a measure of your body' s effort (turning the cranks) hr is a measure of your body' s reaction to producing that effort (pumping oxygen-laden . ...Expand
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@alexk21273 years ago Showing video clip of sram red while answering shimano chainring question. Is that a hint? 1
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@stephmulder3 years ago The tubeless sealant needed to be replaced in my wheels. I cleaned the wheels and tires of the old sealant. But due to cleaning, the tubeless tire is punctured again, because the sealant is out of the hole. Does this have to be patched up with a repair kit (something like the Park Tool patch kit) on the inside of the tire, robust solution? Or is filling with new sealant sufficient? .. ...Expand 3
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@boatman2223453 years ago Speaking of testing new items. When are you fellas going to test a kick bike? If you haven' t try riding one yet you are missing out on great fun. . ...Expand
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@sepg50843 years ago What happens when you get a flat on your carbon wheels while driving aggressively on a gravel bike? What about if you crash?
i' d go with carbon . ...Expand 1
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@erikk70103 years ago My rear disc brake (160mm) only squeal when I am in the drops (perhaps the centre of gravity is to far forward) and the braking power appears to be just fine (can lock up the rear wheel). Is there anyway of stopping the occasional squeal? Many thanks and great show as always. : ) .. ...Expand
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@harleymoore30423 years ago Hey guys, every 6-8 months my HR monitor stops working even when a brand new battery is installed. I have tried various brands but continue to break them even after washing them once a week. What is causing my HR monitor to stop working? .. ...Expand
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@chefchef96483 years ago hey hope you guys are doing well. The part that holds the end of the cable in the left shifter (front chain rings) broke is it possible to replace just that one part or do I have to get a new left shifter. .. ...Expand
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@Lammerz3 years ago
I have a triathlon bike from the late 80s I use it most d ays and it has rather old tyres the front tyre has a split/crack in the side wall about 7-8cm long 2-3mm thick it goes down to this woven felt fabric and I dont know if I should change it, it still works and holds tyre pressure and has been working for about 35 years apparently should I change it? and what should I change it to? .. ...Expand
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@josephfancett97363 years ago Hi guys I currently have a 9 speed 105 group set but got given an 11 speed 105 cassette and crank would it be ok to put them on or would I need to get a 11 speed derailer and shifters as well?
Thanks .. ...Expand
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@razorree3 years ago Basically, you can' t increase your max hr, but you can increase your power.
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@NormAusSmith3 years ago I don' t think you answered thequestion properly. Some components say something like " max 12 nm" what is the ideal setting in this case? Thanks,
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@phuphan9133 years ago . Hi guys, I was wondering if I could fit a 26 x 1.85 tire onto my bike that is reccomended to run a 26 x 1.95 tire? 1
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@khairunsyazwin3 years ago I have a pair of zipp303s (hookless rims) with Pirelli Pzero race tlr- the Max recommended tire pressure from zipp is 72.5 psi but the recommended tire pressure (for my weight according to Pirelli) is 75-80 psi. Which manufacturer should I follow? .. ...Expand
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@michaelfreeman23993 years ago Ollie' s hair genuinely looks so damn good is it weird that i might ask my barber to do the same? Should i check my head? 1
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@chrisridesbicycles3 years ago For the domestiques, the main task is to make best use of their captain, not of their own legs. Do they have information about their captain dialed into their headunits? (in the form of at how many % of the captains FTP am I going) .. ...Expand
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@AlphaJuliet273 years ago Hi Alex and/or Ollie! Hope everyone in GCN is doing well. Just want to ask if cable actuated hydraulic disc brake calipers are good. Might give them a try since hydraulic brake systems are expensive. Plus, it is cheaper to replace if I somehow break my brakes. .. ...Expand 2
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@MR-fz4uc3 years ago Which brake fluid should be used if you combine Shimano levers with Magura calipers (like Froome on his current TDF bike)
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@deuce96243 years ago Has anybody a video series where they follow a bike mechanic throughout a grand tour?
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@MrTOON3 years ago hey guys, you always say that clamping a bike on the top tube on a bike stand is bad, is this the same case on a bike rack?
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@yaacov90083 years ago I thought you were going to change the name to global flying network anyways after last week' s tdf plane discussion.
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@sirmixalot33323 years ago Less good shift
lower quality shift or less crisp shift.
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@lukedizon33213 years ago can we see GCN put together a team that can compete at the world tour level?
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@shahilj3 years ago we know how much Ollie loves Shimano 105. But how much better is it that Tiagra? Except for the extra cog in the back, is it worth considering upgrading to 105 from Tiagra? .. ...Expand
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@Fixingeverthingwithaengine5673 years ago Trying a bike with wings. Then instead of being called gun. You guys would be called gfbcn. Global flying bike cycling network.
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@drmrossing3 years ago Will a crankset from the new sram rival axs group work with on an older bike with rival 10 speed?
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@momohirai62453 years ago when i shift to my heavier gears once the chain on my cassette will instead move three times downward why does this happen and is there any solution to fix it? .. ...Expand
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@gaidenlee3 years ago Are they in a separate room? Hahaha nice division. Trippy!
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@Hill_Walker3 years ago With the Suez 'cycling crisis' ship finally being released, will we finally have the option to buy bike parts again? If so, or if not, how soon till shelves are finally filled? .. ...Expand 1
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@shawnsee26883 years ago I use automotive brake cleaners on my chain to. Then to the ultra sonic cleaner.
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@ravennexusmh3 years ago The brake cleaner answer is usually no, many automotive brake cleaners have chemicals that don' t burn off the lower temps you' ll get with road . ...Expand 1
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@zeetzy74473 years ago Can you go tubeless with brakes? I've seen some wheelset that is tubeless ready, would you recommend it or is it ok?
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@GCDodwell3 years ago Just don' t get automotive brake cleaner on your frame if its powder coated - will strip the coating.
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@zurjon233 years ago Hi GCN! Racing uphill 5kg Steel frame bike set up or 5kg carbon fiber frame set up? Does frame material matters? ..
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@vincentjosh93063 years ago hi, can i put automotive
Brake fluid in mtb brakes??? 1
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@viralfire3 years ago To the person who had a tubeless failure and asked about changing rim-tape. Yes, change the rim-tape! Remove the old rim-tape, give it a thorough cleaning and redo your tubeless setup.
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@Gyarados3603 years ago Are you both in the same studio because the different backgrounds are throwing me off? 10
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@lodovicechristiandalef.53743 years ago how often should you clean your headset bearings? And should I put lube in my carbon seatpost when I have an alloy frame and lube on my alloy stem when I have a carbon fork? Thankyou and have a nice day .. ...Expand
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@dundeedideley17733 years ago Pro team mechs use drills for the through axles.
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@Bratwurstbroetchen3 years ago Do you have any experience with the rattling sounds coming from the Shimano 105 R7000 brake levers when riding in the tops (without touching the brake levers)? If so: is there an easy fix for the noise? .. ...Expand
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@Whiteknuckleadv3 years ago Negative on the brake cleaner the caliper cups are plastic and i have seen brake cleaner destroy plastic parts before.

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