m_sasso wrote:
marcag wrote:
m_sasso wrote:
dkennison wrote:
If anyone wants to do a wind tunnel comparison - I'd be happy to send our disc wheel. :-) No one's wheel will be faster +/- "margin of error" in the tunnel.
I remember when the bike companies participated in an unbiased test (including our frame) a few years ago - they all wished they had not. Kind of cut through all the marketing!!
Be serious, you are trying to tell me your 1290 gram disk wheel is going to have the same performance as my 800 gram Corima disk? In the wind tunnel maybe, on the road way different, and happy to wager before the testing begins which is faster.
How is it "way different" ?
Get out your fist year physics book and calculate how much faster a 800 gram weight will get to the top of a 1km/10% hill when compared to a 1290 gram weight when the same amount of force is applied to booth.
Ok, let me turn to page 113.
On flat at 40km/h you it will cost .490 * 9.81 * .004 * 11.11 = .21 watts. in rolling resistance.....yawn
On a 4% incline, at say 30km/h, 1km = .490 * 9.81 * 40m = 192joules / 120s = 1.6 watts.....yawn....you get some of that on the way down, btw
I guess you were doing the TT on the Planche des belles filles.
Carry on