Crank spacing
04-29-09 | 06:21 AM
#1
Thread Starter
Newbie
Joined: Apr 2009
Posts: 1
Likes: 0
Crank spacing
Hi All
Having purchased a new road bike I noticed things didn't feel quite right. To get to the point the cranks are not in the centre of the bike. The non drive side is a few millimetres further away from the downtube than the drive side, this means that the pedals are not equal distance from the downtube. i have spoken to the bike shop and await their reply. They were trying to think of reasons why this should be but i cant think of any. You wouldn't offset your seat / bars, wheels etc. So surely they should be central. Any answers?
Liam
Having purchased a new road bike I noticed things didn't feel quite right. To get to the point the cranks are not in the centre of the bike. The non drive side is a few millimetres further away from the downtube than the drive side, this means that the pedals are not equal distance from the downtube. i have spoken to the bike shop and await their reply. They were trying to think of reasons why this should be but i cant think of any. You wouldn't offset your seat / bars, wheels etc. So surely they should be central. Any answers?
Liam
04-29-09 | 06:51 AM
#3
Senior Member
Joined: Sep 2008
Posts: 7,296
Likes: 577
From: Loveland, CO
Bikes: Cervelo Rouvida x 2
It's rare for crankarms to measure perfectly centered. I've seen a listing of Shimano Q-factors that shows some to be deliberately off-center. A 2mm difference in the distance from DT to crankarm is only 1mm off center. When you're measuring 170mm from the BB center, a very small angular error is greatly amplified. This is entirely normal.
