currently running 175s but have just ordered some new 165s...
i run a dh tram which has a very low bottom bracket, i run my shock pretty soft and have a shock in there which is slightly to short lowering the bb even more. all of this means its really easy to hit my pedals on the floor when pedalling through rough stuff. im about 5ft 8.
some people have said 165s will be too short but what down sides are there? can it mess your legs up or anything? reduce the amount of power you can put down, help or hinder acceleration???
(the cranks ive ordered had sold out of 170s so they werent an option)
cheers aj

in theory, it will be harder to pedal as you have less leverage on the cranks but you wont spin out as quickly.

but in the real world, you wont notice 10mm, might feel a bit wierd at first just because it is different.

I honestly can't feel the difference when pedaling between my different bikes but have definetly noticed the the difference at certain tracks when counting my pedal strikes.

165's = more rpm for short legs. Ideal if you like to pedal out of corners in lowish gears.

Ive run 180s for a while now. Only 6ft but the liking started on my racebmx with profiles...then fitted thm to a street bike for a laugh and then managed to find a set of turbines for xc

Now im buggerd as i'd like some more 180s but cant find anythin half decent

kool so doesnt sound like there are many bad points really unless your really tall. think i made the right choice, will definately help with ground clearance. marginally lighter too i guess

erm ok so your saying most people should be running at least 300mm crank arms? and why am i going to break my legs?!?!

yeh got some 165s Atlas FRs. cant really notice the difference which is a good thing as everything likes the same as im used to but i know the clearance is alot better now!