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Re: Tire Width (I don't get it) [Slowman]
From a piece I wrote a while back

For system weight (bike+rider and gear) of 95kg, on a smooth road at 25mph. Using Zipp aero data and my own CRR testing:


The wider GP4000 definitely faster in the region I care about. But it's irrelevant compared to having a top end narrow tyre.

I would like the next generation of Tri/TT bikes to be designed around 30mm width. That way we've got the room to figure out which is fastest. It may turn out that once fork interference effects, rotational drag and the CRR/translational drag factors are balance that a true 26mm on a rim designed for it is best. But at the moment it's hard to figure that out.

edit: further to that - every aero test I've done on tyres (with modern rims) has shown true width narrower than rim width to be fastest. So my optimum may be a tyre that has relaxed to 27mm after 300km of use, with a 28mm rim to compensate for the wear.
Last edited by: cyclenutnz: Jun 27, 17 20:08

Edit Log:

  • Post edited by cyclenutnz (Dawson Saddle) on Jun 27, 17 20:08