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They'll have been quoted without specifying the chainring thickness, sprocket thickness or sprocket offset (base of threads to teeth).
You're still going to have to measure it.
For differences of less than 1mm your only realistic option is spacers between the chainring and spider.
Emyr-
For differences of less than 1mm your only realistic option is spacers between the chainring and spider.
For differences less than 1mm, the main option is just to ignore it. Even bushed ⅛" chains will run perfectly happily with <1mm misalignment over the 400mm or so between the two axes.
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Seriously you think less than 1mm out on the chainline is really worth fixing?
I've got a convertion that's about 7mm off and it doesn't throw it's chain?!
Oh and the polo bike is way off in one of the gears...
Both bikes have singlespeed 3/32 chains.
gbj_tester
Khornight2
Right ok I swear this will be my last spam post in this thread.
The Alfine cranks say they give 42.7mm chainline, but the Surly ultra new hubs say they give a chainline of 42.5mm. Is it necessary to implement some kind of spacer jiggery-pokery to eliminate the 2mm difference? The BB (Tiagra external) length is 68mm so I don't think I can reduce it by a smaller BB...