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PostPosted: Sun Nov 03, 2013 7:16 pm 
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Location: In the Garage in Somerset
I've got a 97 Kona Cinder Cone fitted with some Shimano XT M737 cranks, and a Shimano XT M739 front Mech.

I'm having trouble getting the mech set up such that the cage/chain don't rub in at least 1 of the gears.

Now I'm wondering if my BB axle is too long and giving me a wide chainline, although it looks to be about 50mm.

What Axle length should I be using? :? :?:


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PostPosted: Sun Nov 03, 2013 7:23 pm 
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Joined: Wed Mar 07, 2012 12:41 am
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107-113mm


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PostPosted: Sun Nov 03, 2013 7:43 pm 
National & North West AEC
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rider wrote:
107-113mm

Exactly that. Although 113mm is the most common for those cranks.

Chainline should be closer to 47mm ideally.


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PostPosted: Sun Nov 03, 2013 8:47 pm 
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It's got a 113 at the mo as I thought 113mm was the right one.

maybe I'll try a 110mm...

is this likely to be causing my front mech woes?


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PostPosted: Sun Nov 03, 2013 9:19 pm 
retrobike rider
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drystonepaul wrote:
rider wrote:
107-113mm

Exactly that. Although 113mm is the most common for those cranks.

Chainline should be closer to 47mm ideally.

No, the M737 should for most setups be using the 107mm length.

113 should only be used where 107 isn't working, e.g fat tyres causing problems, tubes, mech bands out at 34.9 (Even shimmed down).
I.e. 113 is only the optional length.

Still there shouldn't be to many problems.


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PostPosted: Sun Nov 03, 2013 9:31 pm 
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FluffyChicken wrote:

113 should only be used where 107 isn't working, e.g fat tyres causing problems, tubes, mech bands out at 34.9 (Even shimmed down).
I.e. 113 is only the optional length.

Still there shouldn't be to many problems.


So 110 is not suitable?


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PostPosted: Sun Nov 03, 2013 10:52 pm 
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FluffyChicken wrote:
the M737 should for most setups be using the 107mm length.



This. :wink:

Problem solved mate. :)


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PostPosted: Sun Nov 03, 2013 11:11 pm 
retrobike rider
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matt24777 wrote:
FluffyChicken wrote:

113 should only be used where 107 isn't working, e.g fat tyres causing problems, tubes, mech bands out at 34.9 (Even shimmed down).
I.e. 113 is only the optional length.

Still there shouldn't be to many problems.


So 110 is not suitable?


Technically you'll find out if bottom bracket length is your problem as it should be the same chainline as the 107 (on the Drive Side)
It will however leave the non drive side crank where it is (it only changes on one side)

Give it a a go.
The crank wasn't designed for the 110 (the M739 was for some reason which used a 110 not a 107)

Fit it and worry about being slightly to the left of centre later ;)

It could of course be something else, like just being a pain in the arse, funny chainrings/chain etc.


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PostPosted: Sun Nov 03, 2013 11:25 pm 
National & North West AEC
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drystonepaul wrote:
Although 113mm is the most common for those cranks.


Ooops, misread the original post as M739 cranks.


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PostPosted: Sun Nov 03, 2013 11:32 pm 
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Location: Fife in Scotland
107mm - 113mm

BTW whats the width of you B/B shell?


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