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               Originally Posted by 
               HCR 
                
               
             
              According to my fag-packet sums the difference in 
               diameter will be roughly 52mm, so it looks like your moto-dealer made a mistake 
                 (he gave the increase in radius)
               
                The difference in circumference would be ~163mm.
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         So will this throw the speedo or odometer out? Not sure where the tenere measures this from , rear wheel or front wheel?