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4130, Didn't know they made them that late it would be interesting to see what mods they made to the early ones. The only down sides I can see are:The shift isn't instant you have to wait upto one revolution of the crank before the shiftI think it would be very sensitive to mud (a lot of the workings are plastic so I think wear would also be an issue).Not easy to swap between bikes quickly.Bill, are you just talking about normal gear shifts on 4x bikes or do they have something fancy on them?Chris, The secrets in the hinged outer chainring