rplant Posted June 4, 2007 Report Share Posted June 4, 2007 Does anyone know what the standard rear sprocket is for the M91? My bike was fitted with a jury rigged smaller sprocket that is not even a bultaco sprocket... I need to buy a new one and want to get the same number of teeth that came with the bike from the factory... thanks... Quote Link to comment Share on other sites More sharing options...
greeves Posted June 4, 2007 Report Share Posted June 4, 2007 14T in the front and 52T in the rear. But maybe for the actual classic trials it is a bit long. Quote Link to comment Share on other sites More sharing options...
rcgods Posted June 4, 2007 Report Share Posted June 4, 2007 Greeves is as always spot on, if you call Dave Renham at Bultaco UK he can supply various sprockets etc in 428 and 520 sizes. Mine runs a 46 tooth rear sprocket Quote Link to comment Share on other sites More sharing options...
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