Can't trust alignment marks
Maybe everyone here already knows this, but since I learned this today, I may not be alone. I had heard that you should not rely on the wheel alignment marks printed on the swing arms, but figured, how off could they be?
Today I checked my chain slack after about 1,000 miles and found it on the loose side to about 1.5". Specs are 1.0-1.4. So I got the bike up on the stand and did the whole routine. To begin with, the alignment marks had always been in the same place on both sides. I adjusted both screws an equal number of turns, about 1/2 turn out on both sides. Tightened things up, checked chain tension, and found it about 1.2 or so. Fine, I thought.
Then I got thinking about whether I could really trust the alignment. So I read about how to test this and watched some youtube videos. I used a tape measure and a straight edge and checked pivot bolt center to axle center. To my surprise, I found that the chain side was a full 1/4" or more closer to the swing arm pivot point than the opposite side. And this was with the alignment marks perfectly equal.
I don't have to do any fancy calculations to know that a 1/4" difference is signficant when what you want is perfect alignment. I checked all my measurements many, many times. So I took everything back apart, loosed things up, and had to screw in the non-chain side a fair amount, about 3 whole turns, while yanking the wheel to that side, before I got the two sides to be equal.
When I tightened everything back up I still had my desired chain tension and noticed that the alignment marks were different in this regard: on the chain side the mark on the washer was in a position one full mark ahead of the swing arm mark. On the non-chain side, it was one full mark behind the same mark.
So you really can't trust the alignment marks!
2009 Versys 16K
We sit together the mountain and me, until only the mountain remains.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Last edited by salishversys; 02-16-2014 at 08:30 PM.