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Originally Posted by andrewsuzuki
Have you commented on Tom's breakpoint theory yet?
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Tom is a great guy, but he tests on even smaller rollers - the ones used for training, so the effect of the convex roller is huge. That is why he finds higher pressures working better.
On real roads, the suspension losses always are considerable. We've tested four different tires at pressures up to 180 psi – on very smooth asphalt – and even in this best-case scenario, there is no linear relationship between pressure and performance... These are real-road tests under very carefully controlled conditions, with excellent repeatability (we test each setup three times) and a rigorous statistical analysis to make sure we are seeing real results and not noise in the data.
Quote:
Originally Posted by andrewsuzuki
it seems the GP is ahead by a huge ~7-8 watts. Is this to say Compass tires could be much faster from a more advanced rubber compound (as discussed a few posts above)?
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In
TOUR's test, the Bon Jon Pass was ahead of the Conti - it makes you wonder about these drum tests. If anything, TOUR has a bunch of engineers on their testing staff, so within the constraints of their testing (no suspension losses), I'd put more faith in their testing than in most others.
As to the rubber compound, Panaracer's best rubber – which we use for the Compass tires – is actually quite advanced. Panaracer is an engineering-driven company, and they don't care about marketing, so they haven't given their rubber a catchy name.
Jan Heine
Founder
Compass Cycles
www.compasscycle.com