Reading the above makes me wonder if I'm doing something special that makes them last as long as they do. My trainer-bike with ZIPP 202's (sometimes mount my race-wheels ZIPP 808 also with GP4000s-25mm) have GP4000s 25mm on them and have each covered >1500km (let's say well over 900mi) and still look to be in perfect shape. Not the least sign of wear or squaring or whatever. I've got a new tires laying around and just for sanity-check, I mounted it last week on 1 of the ZIPPs and tried feeling any difference between the new and any of the "old" tres, and I can't feel or see a difference.

I must admit though that I typically run them at reasonably low pressures (90-95PSI max). My disc has the GrandPrix TT tires mounted and I've covered something like 600km on that one and apart from a few little "gaps" from very small stones, that tires also looks to be in perfect shape.

All tires are mounted with butyl tubes, only for races I will mount latex ones for that special race feeling.

S.

Funny you mention that now, Steve.

I was running Conti GP400S 23mm front and back at the TTF on Sunday and had double flats. Ended my race then and there.

I will concede that there was giant waterlogged pothole involved, and both my tubes were Latex. Barely 100 miles on the tires/tubes. Im lucky I didnt go down!

They're close and I don't think you'll be able to get the Specialized cheaper online like the Conti's. Plus I can't even find a turbo with 320tpi cotton casing on the Specialized website. Is it not available yet?

ETA: Is it the 220tpi S-Works turbo?

No...it's NOT the S-Works Turbo. Totally different tire. Supposed to be announced/released today. I guess I'm the only tire geek interested enough to post something right away ;-)

have you ever looked at the R4 Aero in a combo aero/CRR sense? They aren't far off in Crr, I'm just curious is there's anything out there to say they are (or aren't) more aero than other options and might be a good choice. I don't really know anything about them, but I mostly ask because I've got a set and am wondering if/when I should mount them and if for mass start or TT events.

Or thoughts on a 20mm 4000S? I run 404 FC for mass start and the front for TT, but a renn disc (so narrow) for TT. If it's close to the supersonic crr/drag wise, it seems like you could get more miles out of it.

I worded it that way because I was under the impression that latex tubes are more susceptible to flats. Is that not the case?

So first off I will say that again I appreciate your effort with this.

Secondly, I will say that I thought of you as being kind of a short crank skeptic, so I am thrilled to see you took the Pepsi challenge, and validated further what many of us had already figured out.

Which leads me to my third point. Why on earth have you not tested the 23mm SS. I know I have brought this up before and offered one to you, but I will offer it up again. Would be nice to see exactly how it rolls in your own setup.