How did I end up with a 62mm chainline?!?! :eek:
04-17-07, 07:51 AM
#1
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How did I end up with a 62mm chainline?!?! :eek:
This is so bizzare. I finished a singlespeed MTB project using a Shimano Deore FC M-510 crankset with UN 53 BB (68 x 118) and I end up with a 62mm chainline on the outer ring. How in the world did that happen?! I used the recommended BB length for a 52mm chainline, but I ended up with a 62mm. I measured this over and over. It is correct, but I just don't know what happened here. Anyone ever gotten a big error on the front chainline like this ever???
04-17-07, 08:26 AM
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Originally Posted by bellweatherman
This is so bizzare. I finished a singlespeed MTB project using a Shimano Deore FC M-510 crankset with UN 53 BB (68 x 118) and I end up with a 62mm chainline on the outer ring. How in the world did that happen?! I used the recommended BB length for a 52mm chainline, but I ended up with a 62mm. I measured this over and over. It is correct, but I just don't know what happened here. Anyone ever gotten a big error on the front chainline like this ever???
04-17-07, 08:30 AM
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I would guess that you need a 113mm BB instead of the 118 but that still wouldn't bring it down to 52 assuming that you measured everything correctly
04-17-07, 10:58 AM
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Move the chainring in?
04-17-07, 11:04 AM
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118 is looooong.
You do realize that "chainline" for triples is the chainline of the middle ring (for doubles: halfway between the big and the small), right?
You do realize that "chainline" for triples is the chainline of the middle ring (for doubles: halfway between the big and the small), right?
04-17-07, 11:08 AM
#6
hello
I think moving the chainring in would be your best bet. Using a shorter BB on standard mtb cranks might create clearance issues.
