Yes, this is a VERY common issue - probably ubiquitous. For unknown reasons virtually all VTX bikes and most Honda bikes are off between 5-15% on the speedometer. More specifically, the speedo reads 5-15% high. Yours is the worst I've ever heard of (10/55 = 18% high). This can be fixed using something called a "speedohealer". Search the interwebs and this forum for more info. However, be aware that fixing the speedometer using a speedohealer will cause the odometer to be off. Most VTX owners just recognize that this issue occurs, do the math in their heads to know roughly at what mph they are riding, and live with it.
odometer not accurate
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Mentioned above universal issue. My speedo was off +10.0% and by measuring with electronic rangefinder found my odo off just slightly under +4%, both will vary a little bit with wear and possibly more with tire size, sensor measures rotation speed of the drive output gearing. Revolution pulses are on a single digital wire feeding the odo and speedo panel, can't be separated.
A speedohealer plugs into that digital signal and alters the frequency by a programmed percent. One programmed value, one wire, affects both speedo and odo by the same percent. With mine programmed at -10.0% my speedo was right on and now the odo was off by about -6% (+4% + (-10%)). So originally I was accruing about 4% more miles than actual, mpg would also be about 4% too high. Now I am catching up on those lost miles at a 6% rate and my mpg I have to add 6% to be accurate, maintenance intervals, tire wear, etc.
Below is with the speedohealer.on I-84 in Idaho.
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