Crankset Arm Lengths

[EssexBloke]

Chaps, can anyone advise why crankets have different arm lengths? surely because you can adjust the saddle height it wouldn't make any difference? Are crankset arm lengths a personal thing or should you purchase crankset arm lengths according to your leg length or something? Any advice would be appreciated.

[Zacnici]

The first paargraph on this link sums it up really, lot of mystique but I think down to th estyle of the rider whether they like to push it out at 75rpm or spin it at 90+
http://www.cptips.com/crnklth.htm

My old favourite Sheldon Brown
http://www.sheldonbrown.com/cranks.html

http://www.cyclefitcentre.com/pdf%20fin ... _final.pdf

http://www.myra-simon.com/bike/cranks.html

[EssexBloke]

Zacnici - many thanks for those excellent links. Cheers, EB.