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 Post subject: Bad chain line
PostPosted: Fri Jun 27, 2014 11:35 pm 
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Joined: Sun Jan 05, 2014 11:04 pm
Posts: 69
Location: Denmark
i am thinking about running 1x10 on my mtb, i have a xt 785 crankset, but the chain line is pretty bad, and the arms are further out on the drive side than non drive side, is that normal?

Image

drive side

Image

non drive side

Image


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 Post subject: Re: Bad chain line
PostPosted: Sat Jun 28, 2014 12:02 am 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1551
Location: Welland, Ontario
I recently installed a Shimano MTB crankset on my cross bike.

Which appears to have a similar BB width (68mm) to your picture.

The spacers can be moved to fix your problem.

I'm not sure if that answers your original question though which refers to 1X10

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 Post subject: Re: Bad chain line
PostPosted: Sat Jun 28, 2014 12:28 am 
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Joined: Mon Apr 19, 2004 11:33 am
Posts: 363
Location: T'ba!
Attermann wrote:
i am thinking about running 1x10 on my mtb, i have a xt 785 crankset, but the chain line is pretty bad, and the arms are further out on the drive side than non drive side, is that normal?

Image

drive side

Image


From memory the typical Shimano BB setup for a 68mm shell is two spacers on the DS, and one on the NDS; pull one of the spaces out on the drive side it should fix your cross chaining issues. I had to do this on a 2 x 10 setup not too long ago - the chain line isn't perfect but it works fine across the whole range.

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 Post subject: Re: Bad chain line
PostPosted: Sat Jun 28, 2014 8:29 am 
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Joined: Sun Jan 05, 2014 11:04 pm
Posts: 69
Location: Denmark
the bottom bracket can't be mounted then, did you just grind off the edge that is on the plastic barrel? or did you just remove it?


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 Post subject: Re: Bad chain line
PostPosted: Sat Jun 28, 2014 11:50 am 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1551
Location: Welland, Ontario
The Shimano MTB BB uses three 2.5mm spacers that go between the cups and the frame, if it's a road bike width of 68mm. You would need to remove the BB and move one spacer from the DS to the NDS. And reinstall. That then moves the crank 2.5mm to the left.

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


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