Crank Length Causing Problems??

Papa Smurf

As you can see from my sig, I have 2 bikes. The riding postion is very comfortable on both, with correct extension of my legs when I ride. However, when I get on the I-drive, or rather get OFF the I-drive after a ride... I'm in agony and my knees feel like they're made of sandpaper.

I've read nit bits about crank lengths and how it can make a difference, so before I look into it further, can anyone give me the heads up on whether I'm going in the right direction, and if not or even if so, where to look next.

Will measure both crank arm lengths at some point soon, but before I do, where do I measure from? End to end, inner BB hole to inner Pedal thread hole? etc etc

Danke

supersonic

Measure centre axle to centre axle. (or line of)

Papa Smurf

Ok so I've finally got around to having a measure up..

Hardrock:
18" frame
165mm cranks

I-Drive:
18" frame (but obviously the bike as a whole is bigger and the seat where I like it is higher than the spesh)
185mm cranks.

When I had to use it to go to work last few days I put the seat up about an inch higher and voila.. No knee problems. But the riding position was terrible.. I was simply too high up and felt like I was going over the bars when going down even the slightest of gradients.

So would anyone else agree that all evidence suggests that some shorter cranks are indeed needed as an xmas present to myself?

nicklouse

Sorry but have you looked on the back of the cranks as the length is normally stamped there.

and i do not think the hardrock will have 165 and i am dubious of the 185 on the I drive.

Papa Smurf

Axle to axle.. That's what it comes up with.

Either way they're longer, and the increase in seat height seemed to help