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Cranks 172.5 or 175 ? Please help.(8 posts)

Cranks 172.5 or 175 ? Please help.Steve A
May 3, 2002 4:26 AM
This subject came up as my new bike came with 172.5 cranks. I have always used 175 cranks. I'm 5'9" with a 32 inseam.
I do mostly crits and heavy rode training to support off road racing. My question is what is the pros and cons of shorter cranks, I think of my self as a spinner not a crinder. Any help would be great.
re: Cranks 172.5 or 175 ? Please help.heloise
May 3, 2002 5:11 AM
It seems that with your size(inseam) and your preference for spinning(and crit racing-- "cornering clearance") you will benefit from the shorter cranks. But of course it's a matter of personal choice.
Check out for more on the topic.
I use 2 different lengthsonespeed
May 3, 2002 7:05 AM
On my road bikes I have 172.5.

For my track bike I have 170 because of you cant coast or stop pedaling through a turn. Every little bit of extra clearance helps. I still have hit my pedals on a turn and done a highside and landed on my ass though.
Same... but on different bikes!PODIUMBOUNDdotCA
May 3, 2002 7:45 AM
I do to. I use 167.5 on my track bike which I won 4 junior national championship medals on en route to junior worlds last year. On my mountain bike I'm not exactly sure but I'd have to look because being a track rider you neglect your mountain bike at times! Then on my road bike I used 172.5 until I got an adjustable set of PowerCranks (internally clutches cranks at this week. So different bikes basically it can make a difference and people have realized it but at the same time just go with what works best for you. Its not worth it to buy another set of cranks just for the fun because even on the track the difference are a handful of 1/100ths of a second in a 200 m or 10.5-12 second event.

-Nick Corcoran
Riding force behind as he tries to comeback after crashing into the ground at 60 km/h on the track. Watch the story unfold at!!!
175 MTB 172.5 Road. Don't see much diff. (nm)tempeteKerouak
May 3, 2002 7:51 AM
Then why dont they just sell 165, 170, 175, 180? nmonespeed
May 3, 2002 7:59 AM
re: Cranks 172.5 or 175 ? Please help.Juanmoretime
May 3, 2002 7:55 AM
Being a time trailist, I ride longer cranks, it's the gear masher in me. I was alwasy told crit riders go for spin and ahould ride higher bottom brackets because of the cornering. Spinning high RPM's a shorter crank is more advantageous. Go for the 172.5.
re: Cranks 172.5 or 175 ? Please help.Ian
May 3, 2002 7:01 PM
I didn't read the other posts, but this is my standard response, it doesn't matter. 2.5mm is the thickness of two credit cards stacked on top of each other. I still maintain that if you built two identical bikes, other than one has 172.5mm cranks and the other 175mm cranks and then had 100 people ride them, the riders would not be able to correctly identify the correct length at a greater percentage than the guessing odds of 50%.

So, don't lose any sleep, you will be fine.