Ok,
650 wheels are for TT?/Tri applications..

700 wheels are for RR and Track..

WHY??

I have heard that 650's are more stiff, get up to speed faster, etc. Wouldn't this be more beneficial on the Track or in Crits where you have short, quick, powerfull accelerations?

Aren't many/most TT's long enough that an initial "quicker acceleration" would be overshadowed by the "worse" performance of the smaller wheels over the long haul?

Just wondering how they "settled" on the different wheels for different uses. Do larger riders on 60cm/62cm frames often just stay with 700 wheels instead of the 650's?

p.s. Does anyone know of a cheap pair of 650 wheels? I guess they are pretty expensive because a) People spending money on a niche/specific/competition bike typically will pay, and b) much less demand so the prices will be higher...