Thanks for that FR,I did suspect that was what the theory was.Just cannot believe that Suzuki would make a basic engineering cockup like that.So theoretically should it make chains and sprockets last longer.When I have the wheels out for tyres next time I might have a go at running a laser along the rear sprocket and see how the front lines up.If anyone has one of these prior to fitting it would be nice to know how thick the shim is,looks about 2mm at a guess.As an afterthought does it make the transmission any quieter,??