Join Date: Apr 2006
Bikes: 1973 Italvega Nouvo Record; 1965 Hercules; 1982-83 Schwinn Mystery MTB
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The chainline is fixed and cannot be changed. You are correct. Your BB has a fixed cup and an adjustable cup (shown in the pic) with loose balls inside. The adjustable cup is used to get the proper load on the bearings which is then held in place by the black lockring. Look at Phil Wood for an example of an adjustable BB. In that case the bearings are sealed and both cups are adjustable allowing for a small side to side movement.
Last edited by jjvw; 01-19-07 at 10:43 PM.