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Aero Wheel - front or rear?(5 posts)

Aero Wheel - front or rear?Spiderman
May 1, 2003 10:01 AM
Hey, semi lurker/semi poster here. I have been curios about aero wheels (do they make a difference, etc) but i strongly believe that the only way to find out is to ride them. Being relatively low on cash, I wrote it off as something i will have to learn about later on. Anyway, a riding buddy of mine has a front shamal for cheap.

Other than the wanker effect (which i have mastered already) what are the general trends on having one aero wheel as opposed to two, and if you only had one aero wheel, should it be front or rear? thanks in advance.
Put them on both, or if only 1 make it the front. (nm)onespeed
May 1, 2003 10:07 AM
Front is more importantNessism
May 1, 2003 11:19 AM
I'm too lazy to research this to get an exact number but as I recall, the front is 2-3 times more important than the rear.

re: Aero Wheel - front or rear?torquecal
May 1, 2003 4:55 PM
It seems intuitive to say front wheel. But I keep seeing pics of pro time trials with the rear wheel disc'd and the front either spoked or tri spoked (i.e. less aero). Matter of fact, the more I look at the TT photos the more I notice that the most aero wheel is always on the rear.

Anyone know the reason?
Because of streering issues...timfire
May 1, 2003 5:50 PM
1) The practical reason: A disc becomes like a sail in a cross wind; and if put upfront it would increase the difficulty in controlling the bike. The back wheel, however, doesn't effect steering much, so the putting a disc there is fine.

2) The legal reason: the UCI forbids using a disc up front except on an indoor track (where there is no wind).

The reason the front is more important aerodynamically is because the front wheel takes the brunt of the wind while also deflecting the wind off the frame and back wheel (sorry, I forget the technical term). The aerodynamic resistance of the back wheel is further reduced by the fact that the rear wheel is sorta able to "draft" the seat-tube.

Someone more knowledgable can correct/add to what I've said if they want.