Old 10-23-05, 11:15 AM
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for 120mm its five or a Suntour Ultra 6, actually 122 is best for these. For 126 its 6 for a std. spacing freewheel, Ultra 7 needs a bit more and stay relief adjacent to the dropout which the PX does not have.

If you are going to change the freewheel, then threading is less of a problem as one just matches hub and freewheel. Only concern then is that old chains and fresh freewheels often skip under load. Not happy.
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