Quote:
Originally Posted by
redbikejohn
In my experience when a gear jumps it's caused by the "dogs" on the gear (the three prong like bits sticking out the side of the gear not the gear teeth) being worn. This causes the gears to slip back down the box. You can dress the faces of the dogs to stop it happening but that is a bit of a bodge as gears are case hardened.
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That's one of the things that came to mind at first, however if the dogs were worn, wouldn't the bike just shift down a gear and stay there, as opposed to immediately shifting back to the fifth gear?