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The dreaded (but quick) crank arm length question??(3 posts)

The dreaded (but quick) crank arm length question??rob99
Mar 23, 2003 7:41 PM
I recently purchased a Giant TCR 0. About the only thing my LBS left out was discussing the peculiars of the bike was what crank arm length I wanted. Turns out it has a 172.5. I have heard from a couple of people that 175 is "standard". Is this true? I am 5'10" and know plenty of people out there who in fact ride 175. I am coming off a bike that was 170 and certainly notice the extra 2.5mm. It seems that messing with crank arm lenth changes a lot regarding the position of saddle, cleats and maybe stem length.
I apologize for posting a question that I know gets more of it's fair share around here.

Peace :)
re: The dreaded (but quick) crank arm length question??Trent in WA
Mar 24, 2003 12:13 AM
175 isn't standard, though it is pretty common on road bikes, as are 170 and 172.5 cranks. Just set your saddle height so that the distance from the pedal to saddle top at the bottom of the pedal stroke is the same on your new bike as it was on your old and you should be fine--the difference between the two cranks at the top of the pedal stroke will be about five millimeters, well less than a quarter of an inch. I doubt you're feeling that as much as other differences between the two bikes.

175 is not standard. For your M frame, it fits. nmSpunout
Mar 24, 2003 7:16 AM