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Had a play around with : http://www.cyclingpowerlab.com/TyreSelection.aspx and the corsa speed TLR is significantly faster (roughly 30 seconds both with a butyl tube), with the supersonic actually slower than the turbo cotton. The model uses drum data for crr and uses tyre profile to estimate cDa so seems sound enough, although I guess the cda of the tyre depends on wheel width I guess
ThomasdeGlynt
gbj_tester
What happened to Turbo Cottons?
Weren't they #pro-tip last year?