I show the following fifth gear numbers for a Speedmaster, with 43 tooth sprocket, & without the plentiful speedo errors
60 MPH
17 = 3700 RPM (59 mph)
18 = 3500 RPM (59 mph)
19 = 3400 RPM (60 mph)
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70 MPH
17 = 4400 RPM (70 mph)
18 = 4200 RPM (71 mph)
19 = 3860 RPM (69 mph)
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