's Forum Archives - Components

Archive Home >> Components(1 2 3 4 5 6 7 8 9 10 )

Correct Crank Length?(5 posts)

Correct Crank Length?JAM66
Apr 22, 2003 7:14 PM
I am 5'11" tall with a 33" inseam. I was wondering what the right length crank would be 172.5 or 175mm? I also mountain bike ,so should I "match" my Mountain Bike's crank arm length of 175? I probably spend an equal amount of time on both bikes.
chart in bookthe bull
Apr 23, 2003 3:34 AM
I have a chart in book it says
inseam crank length
less 29 165mm
29-32 170mm
33-34 172.5mm
34 or more 175mm
You have long legs but 172.5 is probally going to work
esp. if your a spinner.
There isn't a "correct" lengthMR_GRUMPY
Apr 23, 2003 10:57 AM
I remember reading one of L. Zinn's studies about 5 years ago, where some short people did better on a "long" crank, and some tall people did better on a short crank.
When I went to 175's, years ago, it effected my spin for about 2-3 weeks. After that, no problems..
There isn't a "correct" lengthwielerpret
Apr 24, 2003 1:42 AM
Wouldbe pros and promising young riders are trained to use 'longer' cranks. Longer maybe than the recommended lengths in the chart quoted before by the Bull. 172.5 mm gives more clearance than 175, allowing pedalling in more turns.
re: Correct Crank Length?johnrg
Apr 25, 2003 5:42 AM
I wondered about it myself and am same height/inseam as you. Upon upgrading a couple of bikes I kept it at 175. I questioned a trusted experienced rider/racer/tour mech. who said 175. Last week mountain ascent passed a rider who later complained about his 172.5 and wished for 175.