pyf wrote:
Swissside test shows GP TT bad at higher yaws, just like the Turbo Cotton, Vittoria Evo Tri and so on. For guys who ride that fast GPTT is the closest you can get to a Supersonic WITH a good puncture protection (useful or not... I can't say, some will find SS strong enough, some wants to go with something slightly stronger) and with good enough aero since at 40+ km/h yaws are often under 10°. Speed of GP TT : closer to Supersonic than GP TT, shown by Tour Magazin and also by a very good french website that do testing in a climb (Cycle & Forme)
I've yet to see aero testing with the SS 23, have you ?
SS20 on Aeroweenie thanks to James Haycraft, if you combine Aero and rolling resistance of SS20 (see Tom A. chart) I don't see how the Supersonic 20 can be a good choice (except for weight but weight is not such a big deal except for the hardest triathlons...).
Did I miss something ? I don't see why smart people like TJ would ride SS 20 ???
Edit : the one thing I see I may have missed is tires are most often tested at the same pressure no matter its size, so when a SS 20 is tested at 120 psi and tests with the same RR as GP4000S 23 with 120 psi then it means if you adjust pressure for "similar" feel/comfort it's quite likely the SS 20 (that is very supple no matter the pressure) will be faster at let's say 130 psi than the GP 4000S 23 at let's say 100 psi.
I have seen/heard various data sources that show the contrary to what James has there that have come from either riders who have tested personally or very big companies. I don't know what wheel James is testing with, psi, and whether there is some interaction with that particular P5 fork, but all the other data suggest the SS is significantly faster aerowise than than GP4000s and even at yaw. What I don't like about James data' is that it goes directly against Zipp's own published Zipp 303 data with the GP4000 23, 25, and Attack showing the narrower Attack performs better at lower yaws and that is with the ultra large 303 which is wider than a 404 and 808. Would have been nice just to get a wheel only run from James as well.
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