's Forum Archives - Components

Archive Home >> Components(1 2 3 4 5 6 7 8 9 10 )

Effect of rear aero vs front aero(6 posts)

Effect of rear aero vs front aeroMcAndrus
Nov 25, 2002 7:03 AM
Does anyone know whether or not a rear aero wheel has as much effect on drag as does a front aero wheel? It would seem to my feeble mind that the wind turbulence at the rear wheel would be so high that a rear wheel having an aero rim would have much less of an effect on total drag than does the front rim - which faces the wind directly.
re: Effect of rear aero vs front aeroAndreas_Illesch
Nov 25, 2002 7:59 AM
you're right.
rear wheel has less effect on total drag.
anyway, it's not the aero rim or the aero rim's shape by itself that makes a wheel "aero". phrases like "the rim slices through the wind" are not really true.
the deep section of an aero rim makes that the spokes are shorter so that the spoke's end has a lower speed and therefore a lower drag. at some aero rims you can hide the nipples inside the rim.
the stiffness and durability of a deep section rim allows a low spoke number. low spoke number => low drag.
re: Effect of rear aero vs front aeroWattie
Nov 25, 2002 2:58 PM
If you only fit one aero wheel to a bike the front will give a proportionally higher benefit than the rear, for the reasons you suggested. Trouble is that a deep rim on the front and an ordinary wheel at the back looks all wrong!!!
Yes, butKerry
Nov 25, 2002 5:36 PM
The rear aero wheel will have much less negative impact on handling in crosswinds. A rear disc can even act as a sail in certain crosswinds. Put that same disc on the front in a crosswind and the bike may become unrideable. Everything is a compromise.
Similarly, would the weight of the front wheel matter less?dzrider
Nov 26, 2002 10:41 AM
I would think not, once up to speed, but could you accelerate more quickly if you lightened the back wheel?
Could you repeat the question?Kerry
Nov 26, 2002 4:25 PM
Are you suggesting that it takes more energy to spin up a given weight on a rear wheel than it would to spin up the same weight on the front? The only thing that counts when spinning up a wheel is tire/tube/rim, and that is the same front/rear. It makes no difference whether that weight is located in the front or rear of the bike.