Hi all, I have a newly converted 883 Sportster Super Low, built from a brand new bike in April. I've discovered that the speedo reading is inaccurate by about 15mph when riding at speeds of up to 70mph. It registers about 60 when I'm really doing over 70 as proved by my wife when I overtook her in the car yesterday...!!! The local dealership say it's because of the conversion, using bigger rear wheels and also having it changed to a chain drive from belt. The speedo sensor is in the gearbox. Any ideas on how to rectify this would be gratefully appreciated....thanks.