#askgcntech Hi Olly/Manon and Ian, 2 part question: With the trend towards larger volume tires what is the limitations of road bikes having a standard clearance of, say, 40c, would aerodynamics be adversely affected. Also why do alot of premium tyre models top out at 30c, which is the largest size I can find listed in retailers for the P-zero race tlr. Love the show.

WE had to switch to 203mm rotors, kept shredding the smaller rotors. A 50mph descent every lap during a road race smokes 'em.

I use a Carradice saddlebag to carry my lock because I'm not too concerned about aero or weight. The guys at GCN are far too worried about speed and W/Kg rather than enjoyment. I carry a cable lock and a loud motion sensitive alarm and also have an Airtag on my bike and I sometimes take a small D-lock.

You guys are always filming this before lunch. If you did it earlier in the morning would the alloted time be longer?

Where is the riding?

Anybody got a link to those zip-tie lock things?

#askgcntech I have a duraace 9100 groupset on my summer bike, but am unable to link both L and R crank sensors to my Garmin 1030. Each time i search for a sensor it offers me one or the other...? I have read that you should just use the R side as the balanced normalised power is best calculated from this one, rather than the L side. But I would dearly like to see how balanced (or not) I am pedalling. Stu.

Seeing Ollie take temporary custody of a Canyon Aeroad and a Pinarello in recent weeks has given me an idea for a series of GCN videos. Rather like the “Our Cars” features in motoring magazines, how about featuring each presenter in turn showcasing their bike collections. I’m sure there would be an interesting mixture of old bikes from their racing days, practical ‘beaters’ and the bikes that are loaned by manufacturers?

what kinds of fork and rear do you use? Where can I buy?

Uhh. Yeah. Compliance

What ifbits a rip and not a tiny hole? 😢

I live in an apartment and I got one of those portable pressure washers that you can adjust to water flow. It uses a hose that you can put in a bucket or other device. I use a large 5L plastic bottle that I can put soapy or clean water in. Works great!!

CO2 diffusion is a different beast from "air" diffusion entirely. Many materials that are "airtight" will be permeable to CO2 almost like a sieve.

Interesting CO2 hack - if youre having a problem seating some tubeless tyres, use a CO2 cartridge. Boom! Straight on.

#askgcntech In case it's relevant, I use Silca Sealant and the Muc-off Valves on my tubeless set up. I find that after a couple of rides, or a couple of weeks off riding, I need to be removing valve cores and unclogging them with pins and tweezers before I can pump up the tires to the desired PSI. Bit of a pain if, like me, you only remember to check tires 3 minutes before you're due to ride out. Is this usual? Is there a way to prevent it? etc. Many thanks

To wash your bike--I'm considering getting one of the many portable pressure washers. Muc-Off now has one, but there are many other less expensive brands. Then, take your bike out to the parking garage or sidewalk and clean away.

Use your helmet as a lock. The strap is not strong, but neither those coffee locks.

Speaking of bike-friendly cafes, a few that I have visited have a little bucket of locks that you can borrow.

Probably one of the aspects about the CO2. Question is that CO2 cartridges are readily available? 4 hundreds of different applications. Making them cheaper

2:03 except here in Japan I am often told I have to leave the cafe if I have my bike anywhere in sight. Even a month ago my bike was against a fence on the opposite side of the road, I was told to get out of the cafe. On the plus side theft is low (maybe because you can't take a road bike anywhere), but its increasing every day.

I used the Ottolock for my cafe stops. It rolls up neat into your pocket and it's one that takes a little work to get through, so at least I have some time to react should someone try and snake my bike. It's certainly better than nothing. Sometimes I strap my helmet through the frame and wheel as well, anything to buy some time or deter thieves from wanting to hassle with it in the first place.

I'm not doctor Ollie - but I am a chemical engineer :) . I had the understanding that CO2 permeation on butyl/latex is not a matter of particle size but of chemical solubility - CO2 dissolves better on a carbon polymer than nitrogen/oxygen. Junius David Edwards & S. F. Pickering. "Permeability of Rubber to Gases". Scientific Papers of the Bureau of Standards. 1920 (!) And yeah, CO2 is practical for inflating things because you can get away with a relatively low pressure container that can inflate practical things - it is easy to condense. There are small containers that carry high pressure air (e.g. backup SCUBA tanks) but they are very heavy because they are rated to 3000 PSI which requires a much thicker wall and present much higher risks if breached so are much less attractive for bicycle use.

I appreciate that we need to be mindful of the kinds of lube and degreasers we use when cleaning bikes in a shower as it will end up going into the public sewer system, however, if washing a bike outdoors those same lubes and degreasers would be contaminating the environment without any sort of waste processing. The real lesson is to use environmentally friendly lubes and degreasers regardless of where you wash your bike.

I use brake cleaner which is very fast and effective. No need for expensive spesialized bicycle chain cleaners. Wet a cloth with brake cleaner and clean the chain of heavy grease. Then spray directly on the chain and dry. Done.

If I have to take that tire on and put it back I'm using a new inner tube period. 😃🚴🇺🇸

Some of the Silca sponsored riders used so much sealant at Unbound last year, one of them could feel the sealant moving in the tire as they moved along. Just for a safety.

I've solved the lock issue by opting for a gravel with a third bottle mount underneath - on which I've mounted a Hiplock Switch. It's secure enough for stops in most areas, doesn't rattle and while ~1kg isn't nothing you barely notice it. Just leave it home on KOM hunts. Oh, and use loctite on the mounting screws as vibrations could make them loose.

Hot tip: Buy a Knog Scout as a bike tracker & alarm. Loud enough to deter bike thieves. And double down with an Airtag in your saddle bag or a stealth Airtag holder mount.

It was so nice to see Jon's cameo on GCN Tech!

Build or buy your next bike with a SRAM group set if you don’t wanna have to carry a lock with you. Even crackheads won’t want to steal something that shifts so poorly😂

So, it just like with a butyl tube...

Hey Ollie, very impressed with the 18 minute ride. i just want to make a point on safety, i think you should have used LED lights on your TT bike, you're all in black low profile and going fast, you've very vunerable on the roads, especially the dark Wye road, i'm an older guy and just see the danger more now. I was in Denia, Spain recently and all the pros have backlights on, even in full sun. just have a think.

Colorado Springs...DMac favorite city...love your guys takes...

I was washing my bike in the shower, but my partner wasn't a fan of it. So I bought a 2 gallon (7.68l) pesticide bottle that has a pump and hose. Fill it with water, and I take it down to the street and can spray the bike off, soap it up, and then rinse it off at the end

Awesome videography. Can't wait for the next episode.

CO2 cartridges have many uses, not just inflating bike tires.

Говорят жигой можно прижечь дыру - заклеится и никакой спесификрепейркит и нах не нужон❤😂🎉

'I like bangin in loads....' - Ollie Does this mean something different in England vs America? I cannot help but giggle everytime he says it.

I just started waxing my chain but is there a max power output that would dislodged the wax? I on rare occasions on a short climb will hit 1300watts and was unsure if this would squeeze the wax out more quickly? #askgcntech

"banging in loads" 😂

I think it's topeak or zone of those brands that sell a small lock that sits in the handlebar ends

I have a lot of peace of mind by always carrying a cable lock wrapped around the seatpost that lives on each bike. I use it whenever I go into a shop whether its for 3 minutes or an hour+. Without locking it up, it only takes a jerk 5 seconds to ruin your life for weeks.

I thought CO2 was used because that's what cartridge manufacturers already made for other purposes and the sport of bicycling simply adopted them.

Park Tool has a video on bike washing, where they recommend a squeezable water bottle and a couple of buckets.

If you are doing this from an ecological standpoint, then fine. But from a practical/financial standpoint ... If people are spending 10k on bikes . can they spend $7 on a new tube. 😂

Not a clue. Unbelievable

On the topic of biodegradable and eco friendly degreasers, there are many reasons why you shouldn't put it down the drain at all. Ideally, (at least in the US) you should find your local household hazardous waste facility and recycle the chemicals there. It is much more eco friendly than just simply pouring it down a drain, and additionally, the chemicals can be processed and reused. The same goes for cooking oil, which can be processed into biofuel. Seeing as we just passed by Earth Day, we should be thinking about how we can reduce waste and be more eco-friendly in general. Let's be good stewards for our planet.