> Dennis, Color me an optimistic realist , and an entrepreneur to boot. I hope these tires come thru
> but I have never seen the test results you mentioned. Can you refer or reprint the post.
>
> Thanks Dave
Here's the original post as requested (sorry about the length):
---------------------
From: Hugh waters (
[email protected]) Subject: Re: AAARRRGGGHHH! (was: Airless Tires)
Newsgroups: alt.rec.bicycles.recumbent Date: 2002-12-16 09:12:29 PST
My apologies. In a past post I implied that the Schwalbe Stelvios had a different crr value. My
mistake as I was looking at the wrong diameter. The Schwalbe has very low crr however we have not
yet studied the recovery rate of the tire under load. For simple comparisons of how well this tire
will roll down hill, the crr value is useful. Since the tires' ability to coast has nothing to do
with its' ability to pop back into shape, the crr value will not help completely in calculations
dealing with going up hill. Please find additional crr values.
406 tires Schwalbe Stelvio 130psi 0.0052 Schwalbe Stelvio 120psi 0.0054 Tioga Comp Pool 120psi
0.0065 Air Free Open Road 140psi 0.0066 Continental Grand Prix 140psi 0.0066 Continental Grand Prix
120psi 0.0067 Primo Comet 120psi 0.0070 Tioga Comp Pool 100psi 0.0071 Primo Comet 100psi 0.0074
451 tires Primo Comet 85psi .0065 IRC Roadlite 100psi .0069 Huchinson HP 90psi .0089 Raliegh Record
55psi .0113
Hugh
"Dennis Pedrick" <
[email protected]> wrote in message
news:[email protected]...
> No thread assembly required
>):
>
> 1) Lewis Campbell's rolldown test: Air Free Open Road prototype versus Primo Comet 451: Air Free
> 809 ft, Primo 808 ft. Standard deviation was probably about zero, therefore, Air Free's roll
> _slightly_ further.
>
> 2) John Lafford's rolling resistance (crr) tests: Primo Comet (100psi) = .0074, Primo Comet
> (120psi) = .0071, Comp Pool (100psi) = .0071, Comp Pool (120psi) = .0065, Vredestein S-Slick
> (100psi) = .0098, Vredestein Monte Carlo (100psi) = .0067, Vredestein Monte Carlo (120psi) =
> .0064
>
> Hugh Waters' Open Road tire crr number in the thread (in the thread Air Free > Tires Suck cont'd):
>
> "Our high resilient elastomer material has a crr of about .006 which makes it slower than the
> fastest tire but faster than the slowest tire, however the material resists being flat and its'
> rate of return is about one and half times faster than a comparably inflated rubber tire."