Weight Weenies

JayDee81 wrote: ↑

Fri May 01, 2020 12:14 pm

Jackofallgrades wrote: ↑

Thu Apr 30, 2020 1:31 pm

JayDee81 wrote: ↑

Thu Apr 30, 2020 10:32 am

You will probably hit more debris with the rear wheel compared to the front one, because you can easily manoeuvre around the debris with the front wheel, but the rear one doesn't track the same. This is more apparent when you ride off road, especially on mtb. Also it's easier to lighten the front wheel over debris or cracks compared to the rear one. Plus you have more weight on the rear wheel. All these might be cause of punctures only on the rear wheel.

Absolutely, but I haven't seen this much of a discrepancy in other sets, and purposefully chose the Control in the hope this would counter some of that effect. Certainly in terms of both surface cuts and cuts that go all the way through, it hasn't been noticeably better than Corsas in my experience

Honestly I'd attribute it to pure chance. Most punctures on road are just bad luck anyway.

sethjs wrote: ↑

Sat Nov 07, 2020 10:36 pm

Aerocoach just tested the Corsa 2 TLR for rolling resistance. Pretty terrible results.

I’m trying to figure out why these have been hyped particularly by Josh Poertner for RR when both BicycleRollingResistance and Aerocoach have found them to be pretty bad.

Shame because they’re super grippy...but hard to seat.

https://www.aero-coach.co.uk/time-trial ... tance-data


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sethjs wrote: ↑

Sat Nov 07, 2020 10:36 pm

Aerocoach just tested the Corsa 2 TLR for rolling resistance. Pretty terrible results.

I’m trying to figure out why these have been hyped particularly by Josh Poertner for RR when both BicycleRollingResistance and Aerocoach have found them to be pretty bad.

Shame because they’re super grippy...but hard to seat.

https://www.aero-coach.co.uk/time-trial ... tance-data


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sethjs wrote: ↑

Sun Nov 08, 2020 6:06 pm

He did talk about the "line" pattern that they use, which is similar to the tread patterns used on airplanes.

sethjs wrote: ↑

Sun Nov 08, 2020 3:30 pm

Yup - that's right. My guess - and this is obviously only a guess - is that the rank order of the tires from the roller tests probably roughly plays out on the street - but probably at very different actual rolling resistance levels. But unfortunately, who knows.

That said, @xav would know more. I believe they use rollers and then test athletes on track / maybe street?

Sammutd88 wrote: ↑

Sun Nov 08, 2020 10:36 pm

Can anyone report actual measurements of the 28c and more importantly the 30c Corsa/Corsa Control on a 19mm inner/ 24mm outer width rim? Width obviously but height especially to see if they fit under rim brake calipers. Cheers

xav wrote: ↑

Mon Nov 09, 2020 12:14 pm

sethjs wrote: ↑

Sun Nov 08, 2020 3:30 pm

Yup - that's right. My guess - and this is obviously only a guess - is that the rank order of the tires from the roller tests probably roughly plays out on the street - but probably at very different actual rolling resistance levels. But unfortunately, who knows.

That said, @xav would know more. I believe they use rollers and then test athletes on track / maybe street?

Yes that's what we see (in general), that the rank of the tyres remains the same and the difference remains the same between the tyres, but the actual Crr has a bit of an offset to it depending on the surface. The numbers we quote on the site are for a velodrome and you can add ~0.0025 for a tarmac surface, for example. Once you get into gravel levels of roughness it changes massively though so our focus is very much on the racing side of things.

It's really really important when peolpe are doing on road testing to understand the aerodynamics of different tyres as well as the Crr, otherwise you can get different results and attribute it to Crr rather than CdA if there is an effect there. So when we're really drilling down into tyre work we do roller testing first, then wind tunnel (to separate Crr from CdA) and then validation on the velodrome (both indoor and outdoor).

I did a post a while back explaining a little more how we do it:

viewtopic.php?f=113&t=161827&p=1576132#p1576132