durk onion wrote:
I'm surprised to see such a large difference between the Hed 6+ with 24mm Turbo Cottons and the Hed 6+ with 22mm SWorks Turbos.
I guess I would have expected something more similar to what you saw with the Zipp 101 rims. I'm not too familiar with the tires, but from their website the tread pattern looks pretty similar. Are the Heds just really sensitive to tire width?
As I wrote in the text of the blog (you READ the text, right? ;-), THAT particular Turbo Cotton is my personal tire that had ~700 miles on it at the time of testing, so a big part of that is going to be due to wear and "growth".
The week after I had my tunnel visit, Cam Piper spent some time and did runs of each S-Works Turbo tire width and both Turbo Cotton widths on the Roval CLX64. In that case, the 24C Turbo Cotton plot was offset from the 22C S-Works Turbo by only ~.001m^2 between +/-5 degrees, or basically the same as the 24C S-Works Turbo. The 24C SWT
does perform better at 10 and 15 deg than the 24C Turbo cotton though...but, is it enough to overcome the Crr difference?
That will be all gone over in a later blog post :-)
http://bikeblather.blogspot.com/