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Chain Line Question
How do i know the proper spacing for the bottom bracket to have the proper chain line for a mountain bike triple crank and nine speed cassette?

Thanks, i hope some one can give the learning on this one.
Hi Dos,
Try watching this and see if it helps....

If this is not it come back and we can still help ya out.
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Sheldon Brown "chainline":-

The chainset can be moved in or out a bit with limitations.
You need to check the front derailleur chainline "dimension".
(If Shimano, then see their appropriate tech' document.)
If the chainrings are to far out then the FD won't reach the outer ring.

If the bottom bracket is to short then the inner ring may catch the chainstay.

If buying a new chainset then there may be a recommended BB dimension with it.
Another possible problem, if the chainset is too near the frame, is the chain will catch the outer ring with the chain on the middle ring and smallest sprocket.
Ride hard or ride home alone!
Again I learn something new lol Smile . Thanks cycler. Think I better brush up on the terminology, very very interesting on the dimensions, cool.
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Very good cyclerUK you hit the nail right on the head. I could not have said it any better my self. Books are so much help at times. :-)
My dad always told me a Sledge a matic can fix any thing.

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