Live data from Hacker News

Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

bicyclerollingresistance.com

101–110 of 144 posts

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#101

Earlier quoted context omitted.

If your primary goal is minimizing work, you can also try an electric bike, or driving! Tongue in cheek, but isn’t fitness the point?

Same fitness on a more efficient bike = longer distance or higher speed.

To what end?

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#102
post #12

Earlier quoted context omitted.

Literally 5 seconds of investigation revealed that they offer three durations of membership, each a one off payment (the per month pricing is just a representative amortisation). This is actually so easy to discover, and so easy to understand, that I'm guessing you're just reflexively enraged.

Continuing membership requires recurring payment not "one-time payment".

It’s not a recurring payment. A recurring payment is automatically taken from you, this is a one off payment that gives you access for a set time. It’s very clear on the purchasing page.

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#103

Earlier quoted context omitted.

I've switched to Schwalbe Marathon Almotion from some knobby Kenda and they made a night and day difference. It was a pleasure to ride in the city.

What type of difference did you notice? I switched from a stock Bontrager tires to Continental Grand Prix which are supposed to be high end and didn’t really notice too much of a difference.

I'm in the mountain / touring category. My tires are more than 2.1" wide. Anyway, acceleration was faster and they kept on rolling when I stopped pedaling (because a traffic light was coming next).

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#104

Earlier quoted context omitted.

No. Wheels are a prestressed linear superposition of overall tension and a compressive load at the bottom. Generally, you'll see ~4 spokes at the bottom of the wheel relaxing to take the vertical load. (in a properly built wheel) This is due to rims not being completely rigid, but being a somewhat flexible beam. Rims are nowhere near rigid enough to do the "hang from the top" thing. Spokes will break at the elbow, bu…

The compressive load is negligible, that's why you can build a wheel entirely out of non-rigid spokes such as liteweight wheels or https://berdspokes.com/

There should never be a _net_ compressive load on a spoke, but a spoke can carry a compressive varying/live load if there's sufficient pre-tension from the building process.

You wouldn't want berd spokes to go slack any more than you'd want steel spokes to go slack.

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#105

Earlier quoted context omitted.

Unfortunately you cannot discount the “sponsor effect” here. Wheel manufacturers have been pushing wider rims because it helps them sell another set of wheels to everyone. In the days of rim brakes a wheel had a finite life (the length of time it took to wear down the braking surface). Then shimano and the frame builders pushed everyone to disc brakes, so the wheels now last for ever. What do you know, 2 years later…

I think you might be transposing the cause and effect. Mechanical rim brakes had been limiting the wheel width because of physics of leverage, disc brakes opened demand for wheels of any width and users naturally migrated to the wider wheels.

It can't work like that in the world of mass produced equipment. You can only buy what the manufacturers are making, and as far as I'm aware there haven't been any wheels that are offered in different widths that the consumer can choose from.

It's always: this is the latest model, it has these features, thanks.

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#106

Earlier quoted context omitted.

Unfortunately you cannot discount the “sponsor effect” here. Wheel manufacturers have been pushing wider rims because it helps them sell another set of wheels to everyone. In the days of rim brakes a wheel had a finite life (the length of time it took to wear down the braking surface). Then shimano and the frame builders pushed everyone to disc brakes, so the wheels now last for ever. What do you know, 2 years later…

> Wheel manufacturers have been pushing wider rims because it helps them sell another set of wheels to everyone. I think the push to wider tires and lower pressures on road setups is actually because hookless carbon rims are much easier to manufacture than clinchers, and hookless tires can't handle 80+ psi. Clincher carbon wheels are basically considered a niche product by big manufacturers

You could be right about that. Hookless is an awful idea that benefits nobody...

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#107
post #67

Earlier quoted context omitted.

Unfortunately you cannot discount the “sponsor effect” here. Wheel manufacturers have been pushing wider rims because it helps them sell another set of wheels to everyone. In the days of rim brakes a wheel had a finite life (the length of time it took to wear down the braking surface). Then shimano and the frame builders pushed everyone to disc brakes, so the wheels now last for ever. What do you know, 2 years later…

You're kidding yourself if you think Pogacar would run 30mm tires at 55 PSI at the detriment of speed to please his sponsors. Cyclists are notorious for re-badging stuff they don't want to use and being super finicky with their gear. You're talking about guys that hardly celebrate a win with a $250k purse because they want to make sure they stopped their ride right on the finish line on their headunit.

I don't share your optimism about the strength of the scientific method in pro-cycling :) It's not too long ago (admittedly in the pre-disc brake era) that climbers would have their bike built up to sub 6.8kg and then add weight to it to bring it up to the limit rather than use deeper wheels.

If you look at TT equipment all team members use the same helmet regardless of the fact that helmet performance varies massively from rider to rider.

The 2016 S-works Venge is 5w faster than both the SL7 and SL8, so on flat stages all specialized sponsored teams are riding it... aren't they?

Why is nobody wearing a TT Helmet and visor on a normal road stage?

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#108

Earlier quoted context omitted.

Unfortunately you cannot discount the “sponsor effect” here. Wheel manufacturers have been pushing wider rims because it helps them sell another set of wheels to everyone. In the days of rim brakes a wheel had a finite life (the length of time it took to wear down the braking surface). Then shimano and the frame builders pushed everyone to disc brakes, so the wheels now last for ever. What do you know, 2 years later…

I feel that any marketing strategy that relies on the niche of a niche formed of the people that would buy the cutting edge cycling gear just because it's presented as an improvement over the status quo, would hardly bring any benefits to any wheel maker. I am 100% sure that in this age of "marginal gains", the pro tour teams would not go for anything that doesn't give them it unless severely hamstrung by sponsorship…

>And I think you're severely overestimating wheel life span for modern models, at least due to the fact that carbon is more brittle than more pedestrian materials. Just look for Pogacar's fall earlier last week in the Giro to see how a simple flat tire makes the whole wheel a risk.

My experience is personal, but I get 50,000km out of a set of rim brake carbon wheels ridden in all terrains and conditions and through northern european winters. At that point you're also starting to lose spokes/nipples to corrosion, but the rim could be rebuilt with new spokes and a new hub if it didn't need a brake track. That riding includes racing, crashing, potholes, punctures.

Pogacar rides on Enve wheels, which are now hookless and therefore a puncture is much more likely to result in damage. Another innovation that makes life worse for the consumer and better for the manufacturer.

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#109
post #84

Earlier quoted context omitted.

To add to this, unless you are actually competitively cycling (you probably aren't) this sort of thing makes pretty much no difference for someone that is using cycling for transport. It's a bit like obsessing over the lightest frame possible. Yeah, we can get a 1lb frame made of space materials but at the end of the day it's basically something that will reduce a cyclist's average speed by like 0.1mph. For anyone do…

I think it’s a little different than bike weight, which makes very little difference for anything other than lifting it onto a rack or taking it up apartment stairs. Rolling resistance makes slightly more difference than that.

Maybe it's just me getting old but... as a scientist I love technical reviews however I care more and more about feeling that real world performance. If a tire feel fast, it's what I will go for. My favorite road bike is my 12yo CAAD10 because I just love how it feels and the geo is perfect for me. This kind of thinking has been mostly phased out of the reviews and the design lately while the engineering has been optimized to a point almost all new bikes (and also true with cars IMO) feels more or less the same. Nowadays, I value character over numbers.

Re: Bicycle Rolling Resistance: Tire Rolling Resistance Tests and More

#110
post #84

Earlier quoted context omitted.

To add to this, unless you are actually competitively cycling (you probably aren't) this sort of thing makes pretty much no difference for someone that is using cycling for transport. It's a bit like obsessing over the lightest frame possible. Yeah, we can get a 1lb frame made of space materials but at the end of the day it's basically something that will reduce a cyclist's average speed by like 0.1mph. For anyone do…

I think it’s a little different than bike weight, which makes very little difference for anything other than lifting it onto a rack or taking it up apartment stairs. Rolling resistance makes slightly more difference than that.

And if you live in a mountainous area, bike weight do make a big difference, up to a point. :)
Post reply on HN