's Forum Archives - Tour-Giro-Vuelta

Archive Home >> Tour-Giro-Vuelta(1 2 )

Quick question....(4 posts)

Quick question....SpyderRyder
Jul 27, 2003 11:09 PM
A little off subject but I was wondering if anyone knows some sort of equation for bike weight to speed. You know of you produce a constant amount of power how much faster will you go if you loose a pound or 5?

I can average about 20mph on my 25lb mt bike on a flat road and was wondering how fast I could go on a nice Giant TCR composite at about 17lbs. Remember the speed jump you got when you got your first really good bike?

Any physicists out there? I realize hat aerodynamics come into play at abombt 20 mph but lets say in a vacum how much speed would be produced per pound of weight lost.

Curiosity is a gift.
Quick answer,TJeanloz
Jul 28, 2003 5:11 AM
In a vacuum? On a level surface? Weight doesn't matter.
re: Quick question....James OCLV
Jul 28, 2003 5:49 AM
Check out Plug in the numbers and see. As Tjeanloz said, on a flat surface weight isn't really a factor.
Rolling resistance IS a big factor...zero85ZEN
Jul 29, 2003 5:06 AM
Skinny tires would make the biggest difference between Mt. Bike and road bike on flat surface in a vacuum. Tire friction would be the ONLY variable in such a hypothetical situation.