|175 vs 172.5 mm cranks||New Steelman|
May 2, 2001 10:01 AM
|Just took home a new bike. New cranks are 175mm vs 172.5 on my old bike. What will the difference be? Thanks.|
|crank length formula||ET|
May 2, 2001 10:14 AM
|"According to Hinault and Genzling, those with an inseam from 74-80cm should use 170 mm cranks; from 81-86cm inseam 172.5mm cranks and inseams from 87cm to 93cm 175mm cranks."
That is a quote from the Feb '01 issue of Cycling Plus. So, what is your inseam? BTW, if you keep your handle as a permanent one, expect some flak (see another thread). I presume your bike is a custom. If so, wondering why you didn't clarify this before you bought the bike.
|The difference will be||Steeve|
May 2, 2001 10:20 AM
|about 2.5mm per crank. All you have to do is subract the lengths.|
|The difference will be||new steelman|
May 2, 2001 11:47 AM
|I have to clarify. The bike is custom and I did get fully measured for it. The thing fits like a glove. My question is how much of a difference in feel will the extra 2.5cm make? Are you all of a sudden producing more torque per revolution? Sorry, I'm a geek at heart. Can't wait to get on the bike this weekend. SR 525, Daytona group, Ozuo Pro.|
|The difference will be||mmaggi|
May 2, 2001 11:54 AM
|2.5mm = .25cm
1.0 inches = 2.54cm
.25cm = .1 inches or 1/10 of an inch
Therefore, the difference between 170mm crank and a 172.5 crank is 1/10 of an inch.
I really don't think that it could make that much of a difference.
The difference between 170mm crank and a 175mm is 5mm or .5cm or 1/5 of an inch. You might feel a difference there.
Hec, I don't even think you'll realize a difference.
|re: dont worry||cyclopathic|
May 2, 2001 12:00 PM
|you wouldn't feel it, just lower seat by 2.5mm
I have 170mm road and 175 mnt. shorter cranks, spin faster? not so my mnt cadence is higher due to lower gearing/wider gear spacing.
|re: 175 vs 172.5 mm cranks||Woof the dog|
May 2, 2001 4:06 PM
|Beware the knee pain. Get 172.5 mm cranks. Lighter (psychological edge), better in sprints, better clearance in crits, saves your knees.|| |