The Duckmeister wrote:Does your frame have a 68mm or 73mm BB shell? Both are common in MTBs. The spindle needs to be long enough to fit 73mm shells, plus the odd occasion when an E-type bottom bracket-mount front derailleur is fitted, so spacers are used in order to allow correct bearing tensioning without lateral play when the BB assembly would otherwise get narrower.
If you have a 73mm shell and an E-type front derailleur -> no spacers.
73mm shell, normal seat-tube mount FD -> one spacer on the right, none on the left.
68mm shell, E-type FD -> One spacer each side (FD inboard of the RH spacer).
68mm shell, standard FD -> ONE spacer on the left, TWO on the right.
This type front derailleurs do not clamp around the frame's seat tube, but instead are attached to the frame by a plate mounted under the drive side bottom bracket cup and a screw threaded into a boss on the seat tube. These derailleurs are usually found on mountain bikes with rear suspension components that do not allow space for a normal derailleur's clamp to go around the seat tube.
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