Old 05-18-11 | 05:35 PM
  #1  
Suburban Grind
occasional cyclist
 
Joined: Jul 2010
Posts: 141
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Installing adjustable bottom bracket - chainline question

I am putting a shimano octalink v1 polished bottom bracket into 68cm wide english-threaded steel bike. It was probably a 10-15 year old new-old-stock, so I dissassembed/cleaned/re-greased it. It appears to be an adjustable cup style model with both needle bearings for radial loads and angular contact ball bearings for transmitting thrust loads. Also external lock ring on the NDS cup (tolerates variance in shell widths?). To be used with FC 7700 39-53 double crank. dropouts are 130mm apart. Assuming the drive side cup doesn't necessarily bottom out, what factors and limits should I try to obtain?

Like:

Specific clearance between the closest chain ring approach to the DS chainstay? Start with a distance X from bottoming out the DS cup, build out the rest of it, see where the chain rings end up then adjust? Shoot for an optimised big chainline across the cassette? Where ever the NDS cup locates the spindle?

Have never wrenched this combination before, and don't want to end up with a ham-fisted result.
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