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It's my understanding that the America & Speedmaster use the same 43T rear sprocket as the standard Bonnie. No?



Nope. If you look up the final drive ratio for the Bonne/T100, they are different even though they use the same sprocket at the transmission end. That can only mean the rear sprocket is different. Another thing that makes it sure that the rear is different is that they Bonneville final drive ratio is about midway between the America and SM, and those are only 1 tooth different at the gearbox end.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python