Originally Posted by
69chevy
Logic would tell you that the front wheel would have more impact, but the truth is, without any testing of you on your bike in your normal position, at your normal speed, any answer you get will be a guess.
When logic fails, there's always direct measurement to fall back on. There's been enough testing to know that improving the front wheel always gives a greater benefit than the same improvement to the rear (there may be some extreme cases where this is not so, but I've never seen one). Zipp has published that putting the improved wheel on the rear gives about 75% of the improvement seen by the same wheel on the front.