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BB offset O.K.?

1602 Views 4 Replies 4 Participants Last post by davep, Jan 5, 2010

ghughes.hesinc

Discussion Starter · Jan 4, 2010

I'm changing to a 2x9 set-up. I'm thinking about spacing the BB 2.5mm to the drive side to improve the chain-line. I will be running the inner and middle rings.

Is offsetting the spindle center a big deal? Does anyone think you can feel 2.5mm in your legs, knees, or hips?

If anyone is running a set-up like this i'd love to hear what you think.

I should mension it's a ISIS BB with a 73mm shell and 113mm spindle

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wesMAmyke

· #2 · Jan 4, 2010

On some/most BB's spacing 2.5mm to the drive side will probably center the cranks not offset them. It is common for there to be a little offset to the non-drive side to improve chainline for a triple.

If you are running small/middle it sounds like it would work. YMMV

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zebrahum

· #3 · Jan 4, 2010

I've done the same thing with external bearing cups with no noticeable change to my pedaling. Best way to know is to try!

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ghughes.hesinc

Discussion Starter · #4 · Jan 5, 2010

Try I will

Thanks guys.

I've already got it installed. How much of a differance can 2.5mm make anyway? The differance in most peoples leg lenght is more than that.

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davep

· #5 · Jan 5, 2010

zebrahum said:
I've done the same thing with external bearing cups with no noticeable change to my pedaling. Best way to know is to try!

Did you know that all external cranks already have a wider chainline (50mm) than ideal ? Moving them any further than the stock would make your chainline worse.

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