F
Frank
Guest
I recently bought a TREK 8000 (2003 year model). All components are stock. Ever since I got it I
have had problems with the drive chain. I'm constantly experiencing a thrown chain and chain suck.
It even happens on smooth hard pack trails. The LSB have adjusted the drive chain twice but it has
not solved the problem.
Today I noticed another problem. The rear wheel is not properly aligned between the tubes where the
rear brake is mounted. When measuring from the tube to the rim from both sides I see a difference of
3.2mm. If I instead measure at the chainstay I see a much smaller difference – less than 1mm. That
tells me that the frame is out of alignment, not the wheel. Correct?
To support why I believe it is a misaligned frame I mounted the wheel opposite and measured the same
distances again. All measurements were as before within 0.3mm. That proves the wheel is correct and
the frame is out of alignment. Besides that this is unacceptable I'm wondering if this could explain
why I'm having so much trouble with the drive chain.
I unmounted and remounted the wheel several times to be sure it was properly seated. I was able to
repeat all measurements within 0.2mm.
What's an acceptable tolerance for a frame?
Any suggestions and help are highly appreciated.
Frank
have had problems with the drive chain. I'm constantly experiencing a thrown chain and chain suck.
It even happens on smooth hard pack trails. The LSB have adjusted the drive chain twice but it has
not solved the problem.
Today I noticed another problem. The rear wheel is not properly aligned between the tubes where the
rear brake is mounted. When measuring from the tube to the rim from both sides I see a difference of
3.2mm. If I instead measure at the chainstay I see a much smaller difference – less than 1mm. That
tells me that the frame is out of alignment, not the wheel. Correct?
To support why I believe it is a misaligned frame I mounted the wheel opposite and measured the same
distances again. All measurements were as before within 0.3mm. That proves the wheel is correct and
the frame is out of alignment. Besides that this is unacceptable I'm wondering if this could explain
why I'm having so much trouble with the drive chain.
I unmounted and remounted the wheel several times to be sure it was properly seated. I was able to
repeat all measurements within 0.2mm.
What's an acceptable tolerance for a frame?
Any suggestions and help are highly appreciated.
Frank