J
Joel
Guest
I have a Trek 5500 which I built up from a frameset using Dura-Ace 9
speed components including a BB-7700 bottom bracket and 12-25 cassette.
>From day one which was years ago I have had the following problems:
1. Can't use 53T front chain ring with second biggest 23T rear cog. The
chain makes a lot of noise and appears to be at a large angle. Sometime
the chain gets pulled off the front 53T ring onto the small ring.
2. When I use the 39T front chain ring with the biggest rear 25T cog
the chain makes more noise than normal.
Initially I took to my LBS who had installed the BB. They checked the
chain line and told me it was ok and that on some bikes you just can't
use that gear. They also tightened the drive side crankarm as much as
they could to get it as close to the frame as possible. So I just lived
with the problem for years.
Today I took apart my crankset to fix a clicking noise. While doing so,
I measured the distance from the end of each crankarm to the chain
stays. The drive side measured 3mm further from the chain stay than the
non-drive side. I am not sure if this means anything. Do I have a chain
line problem? If so, how can I fix it? I see no way to make any
adjustments.
Thanks - Joel
speed components including a BB-7700 bottom bracket and 12-25 cassette.
>From day one which was years ago I have had the following problems:
1. Can't use 53T front chain ring with second biggest 23T rear cog. The
chain makes a lot of noise and appears to be at a large angle. Sometime
the chain gets pulled off the front 53T ring onto the small ring.
2. When I use the 39T front chain ring with the biggest rear 25T cog
the chain makes more noise than normal.
Initially I took to my LBS who had installed the BB. They checked the
chain line and told me it was ok and that on some bikes you just can't
use that gear. They also tightened the drive side crankarm as much as
they could to get it as close to the frame as possible. So I just lived
with the problem for years.
Today I took apart my crankset to fix a clicking noise. While doing so,
I measured the distance from the end of each crankarm to the chain
stays. The drive side measured 3mm further from the chain stay than the
non-drive side. I am not sure if this means anything. Do I have a chain
line problem? If so, how can I fix it? I see no way to make any
adjustments.
Thanks - Joel