Crank arm lenght

[Hendrik_S]

its all about your legg lenght and more specifically about your femur length really that determinse what crank you should ride

 

 

[JA-Q001]

Only differance is that a shorter cranck eccalerates faster (smaller pedalling diameter), longer cranks = more leverage (bigger diameter), so if you like being a diesel, keep to the longer crank. If you like sprinting and jumping, shorter.

[ZeroPlay]

By far the easiest length to resell (if you ever want to) is 172.5mm

 

I'm 1.78m tall and 172.5mm feels best to me.  I also ride 175mm on MTB and on one of my road bikes, but prefer 172.5mm.

 

[Underachiever]

My femur/inside leg measurement is shortish and I should ride 172.5 mm cranks according to the calc.

 

Didn't know any better when I started cycling in '83 and had 175 mm ones fitted.  Never changed since then and never had an issue.  Used 172.5 mm ones on the track many moons ago, because I couldn't find 175 mm ones.

[Speed Devil]

I am 1,87m and have ridden all the years with 175mm cranks. When I had my DA 7800 gruppo fitted they slapped a 172,5mm crank on and I was non the wiser until I serviced my bike a few months later and made the shocking discovery.

 

I never really noticed any difference and don't feel at a disadvantage either.

As for shorter cranks accelarating faster, I don't think 2,5mm is going to make any difference in a sprint for the 1988th place...not unless you trying to break a world record.

 

As said earlier, 172,5mm cranks are easier to get rid of when wanting to sell them.

 

just my 2c

[Comebackboy]

I am 1.77m and ride a 175. Got short legs for my length as well, but then again i tend to ride heavier gears... If you like to spin more i would say go for 172.5 but not really shorter.  Rode a 180 on my TT bike, but there again, i rode heavier gears, so then it helps.