Whats the puncture resistance like on the ss though? It seems the TC has better puncture resistance so to me, 2-3 watts may be worth giving up for a little extra comfort.

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i would probably go for it esp for courses with no known high yaw wind.... but i said what wd be probably the fastest

I raced them the first time at IMAZ 2015. Felt great, and still going strong. They now have several nicks in them from riding over some gravel/salt on the winter roads in Boulder, but I haven't had a flat yet. I have not used the Zipps so can't compare with those specifically.

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A couple of years ago I raced on a SS 23mm front for 3 or 4 x 70.3s and 1 x 112mi with a few shorter ones in there. No issues.

Last year someone borrowed my wheels that had 2 x TC 24mm and slashed the rear at Raleigh 70.3

So the short answer is: it depends.

Does anyone have any leads on acquiring 24 Turbo Cottons at the moment? Google and EBay coming up empty.

Did you check your local shop to see when they might be available? I'd call Specialized too. I have no idea when mine will be here

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In that case, I have 2 for sale for $100 each ;)

One brand new, one with 20 miles.

You had to say that didn't you? I'm racing raleigh 70.3 this year.... crap

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wrong forum, move it over fella ;)

My LBS has 24's and 26's in stock. If you're antsy, I'll pick them up and send 'em to you for my cost. I need to drop by this week anyways.

PM me if you are interested.

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/kj

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Found them locally. Thanks.

How many miles are folks putting on the turbo cottons before tossing them? I raced on them last season, 2 70.3s, a full IM, couple olympics, and a sprint. maybe another 100-150 miles of general use as i had no alternative on particular days.

well the longer you use any tire, the faster it rolls, but the wider it presents to the wind. Ride 'em longer!

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Anyone think that the vittoria corsa speed may be better than the turbo cotton? Same 320 tpi cotton casing, but in a slightly narrower form factor. Unless the graphene compound is slower than specialized, they seem to have enough in common to think that it will have great Crr and better aero from being narrower.

That's in interesting question. Graphene and the new Michelin have yet to be tested independently but if their claims are correct they will be at the top of the charts on par with the best tires, which also makes me think that there is an upper limit

Holy grail I think would be to make an aero turbo cotton or for the Conti engineers to make the GP 4000 S a better rolling tire

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My team is sponsored by vittoria, and I have a few corsa speeds on order. Happy to send one off to a forum member for Crr testing.

Some people seem to be running a 26 mm tc in the rear. Why the wider tire in the rear? Is it faster than 24 mm? More stable for turning?

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Wider rear tire: more cushion for the push'n, lower CRR, (generally) better shielded/in turbulent air mitigates some of the CDA penalties of a wider tire. Think discs also mitigate tire size to a decent degree?

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Crr-wise, I found it only .0001 faster...so, barely.

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Two quick OT questions: do you have any thoughts on the Zipp SLSpeed tubular? I would assume the 24mm version is aerodynamically optimized for the firecrest rim, no?

do you find it curious that a wider tire only rolls that much faster? Is it possible that there's a limit to how fast a tire can roll?

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Bigger tire at the same inflation pressure will have less deflection, therefore less deformation in the casing.

I raced with the SL Speed last season, 24 mm up front on an 808 firecrest, 27 mm in the rear on a Sub 9 disc. They felt fast, but I doubt I could really tell a difference. Two observations, though. First, wet grip was abysmal. They even come with a warning "for use on dry roads only". Went down at 13 mph at Chatt 70.3 on wet roads. Second, I found the handling rather sketchy / unstable. On the same descent one day to the next, I was white-knuckled on the horns with the SL Speed vs. full aero >5 mph faster with a Conti something or other (replaced front only). For those reasons, I'm dumping the SL Speed for this season.

I think it just shows that the Crr on that tire is more dominated by the tread (glued on - appears to be same mold, i.e. same width) rather than losses in the casing.

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I have no insight into whether or not that's a good assumption...sorry.

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