My 66 Vespa 150 has the seedometer in Klm. I've used several different methods to get a mph conversion. I know it's not just straight conversion from klm to miles because of the 8" v. 10" tires I have. The other day, I taped a friends GPS to the scooter and got a reading quite different than that which I had been using. I would assume the GPS to be accurate, but just wondering how others make the conversion and what conversion factors you ended up using.
Thanks, Jeff