stevej wrote:
https://www.slowtwitch.com/...nd_858_NSW_8432.html The chart shows a 4-5 watt improvement (mostly due to aero). But the article mentions only 1 watt?
Hmmm...I'm going to need more info on this "rolling road" setup...since the only difference between the bottom 2 lines is tire width (same rim), and the setup really is only going to measure Crr differences (if "like a treadmill", then the only aero component measured is going to be rotational drag, which should be practically identical)...because I don't get how at the lower pressures the 28 and 30 tires have the same rolling resistance, and then 28 actually gets 1W faster above ~68 psi?
That's opposite of the previously measured "wider measured tire widths are faster at equivalent pressure" observations, which is exactly what the 25 line vs the other shows (since this is a "delta" plot).
I wonder what the accuracy and precision is of that test setup? Are the 2 tire width constructions actually "equivalent" (i.e. same casings and tread compound and thickness)?
And how is that "Hooked vs. Hookless"? It's 2 completely different inner rim widths and different label tire sizes. I suspect both of those things have a much bigger influence than hooks or not :-/
So many questions...
http://bikeblather.blogspot.com/