Login required to started new threads

Login required to post replies

Re: New Zipp 858 NSW and 808 [stevej]
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/
Last edited by: Tom A.: Aug 8, 22 14:37

Edit Log:

  • Post edited by Tom A. (Dawson Saddle) on Aug 8, 22 14:37