Another reason is that the 7 speed freewheel may not give you an extra gear where you really need/use it.


For example, if the 6 speed FW is 13-15-17-20-24-28 and the 7 speed is 13-14-15-17-20-24-28, while that 14 makes sense from a gear-inches perspective it may not help at all if you don't go that far down on the cogset very much. So, worth looking into.