Originally Posted by
BlazingPedals
They don't make bottom brackets in 1mm increments. If you're only 2mm off from the ideal, then you're about as close as you're going to get. Most likely, you'll just have to tweak either the limit screw or the cable tension.
It is hard to tell if this is the case for the OP, but there are some BBs that can be adjusted by loosening lockrings on both sides and threading the BB to one side or the other. However, if the pedals are close to centred in the frame, 2mm will not make enough af a difference (and is likely within most peoples' ability to measure chainline) to go tot he trouble.
Also, that is kind of a weird setup - unless it is an aftermarket boutique BB, you normally only find cup-and-cone BB shells designed for splined BB tools on the cheapest of the cheap bikes. I suspect there is either a parts mismatch (cups from one style of BB kludged to work with another style), it is not a cup-and-cone BB, or someone has gone out of their way to take an ultra-cheap cup-and-cone BB from a X-Mart bike to install on this (apparently) decent aluminum road bike. Or perhaps it is a BB designed for a 73mm shell and the lock ring was added to cover up the extra exposed threads.