Crank Length
11-01-06, 06:27 PM
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Crank Length
My current main bike has cranks designated as 172.5. A TT bike I am lokking at has cranks designated as 170. What difference if any will this make besides that they are obviously shorter?
Last edited by curiouskid55; 11-01-06 at 06:33 PM.
11-01-06, 06:30 PM
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There was just a big thread about this a day or two ago. It's 172.5 and 170. It's the length in millimeters from bottom bracket center to pedal spindle center. Smaller cranks "spin faster" because they form a circle with a shorter circumference (that is, each revolution travels a longer distance), but you're looking at a small small difference. There is also a biomechanical difference; people with longer legs (femur?) generally use longer crankarms. You should be fine, and if it is a problem, you can just replace the crank and sell the old one.
11-01-06, 06:38 PM
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170 should be fine for you. I'm 5'10'' and have three 172.5's ,one 175, and one 170. I honestly cannot tell the difference between them.
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03 Specialized Allez CrMo-Singlespeed conversion
03 Specialized Allez CrMo-Singlespeed conversion
11-01-06, 08:45 PM
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Aluminium Crusader :-)
yeah, try them, you might like them.
With the same reach to the bottom of the stroke, you'll be 5mm higher over the pedal through
the top of the stroke -- some people like this
With the same reach to the bottom of the stroke, you'll be 5mm higher over the pedal through
the top of the stroke -- some people like this
11-01-06, 09:34 PM
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Search under my name for a big thread I started yesterday with lots of links to help you calculate crankarm length. I have a 33.1" inseam and was between 172.5 and 175 and went shorter. As a rough guess, I would think 170 would work for you.
