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Hi All,
I'm hoping to build up a Pompino 120mm rear end (I can no longer get the 135mm rear end version in an XL anywhere and I already have wheels for that! Bugga).

I need to know the chain line so that I can sort out a crank set. I was hoping that I would be able to run a MTB crank. I have a set so square taper Hollowtech Deores that will do nicely. And this will gove me a lot of chain ring options.

I just need to know the chain line number for a 120mm rear hub, so that I can work out the right BB axle length.

Cheers all
 

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when mounted on 110 or 113mm spindle bb the chainline of that deore is 47.5 to 50mm (middle) with inner at ~42.5mm. the chainline of a 120mm track hub is 42mm. so your best bet is a 103mm BB and use the middle ring.
 
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