Re: Tire rolling resistance


Ron Ruff wrote:
41 wrote:
Does anyone have a version of these graphs with the Crr, to better
compare with other data, such as the Tour mag test results given in a
previous post in this thread? Does anyone have offhand the conversion
factor for resistance as indicated on these graphs, to Crr?

For the road tires the load was 50kg... so just divide the resistance
by that to get Crr.

Ah, thanks, I see- but you mean the inverse, and first convert kg to
g or vice versa.
Anyway, here are some data points the other way, for a 50Kg load
(light, their Crr was based on an ~85kg load, tire pressure not given):

Deda Tre 190g
Michelin Pro 2 Race 210
Michelin Carbon 250
Conti UG 290
Conti GP 3000 335

Avocet Road 250 (about) (at 7.5 bar/109psi)

The Avocet Road has to be lower than the Michelin Carbon, for several
reasons (same or softer rubber but thinner, slick versus rough, 3 layer
vs 4 layer, wire bead vs. Kevlar), so this tells you that while the
numbers from the two tests are roughly comparable, there are some
differences. Perhaps just the pressure, but that would mean Tour pumped
them up to maybe 115-120psi+, which seems high.

.

Relevant Pages