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I don't think 16T is stock anymore. On your Bonnie what is the number of teeth on your back sprocket? My SM has 43 teeth if memory serves.Also over all tire dia. makes a difference.



43 is the stock rear sprocket, 18 on the front. I believe there are differences with the stock sprockets on the Triumphs:

Bonnie T100: 18
Bonnie standards: 17
Thruxton: 17
America/Speedmaster: 16

So if we are going by sprocket size, then it would seem that the Bonnie should have the lower rpm at high speed than the America/Speedmaster but it seems just the opposite is true.