Me and the wife just got back from a little 80 mile ride. We gassed up and set our trip meters to 0. Her 2014 SGS with 300 miles got 80.0 exactly and my 2013 EG ultra limited with 9000 miles got 78.4 both bikes have original tires. That seems to me, like that is too big a difference. The only variable I see is the tread depth on the tires. 1.6 mile difference I'm confused

 

Your speedometers are off from each other. 1.6 miles in 80 is not bad at all.

 

most harley speedos run about 4-10%fast,check it with gps.

 

That doesn't seem like a big difference to me. Maybe you cut all the turns alittle closer than she did

 

federal regulation allows for speedometers to be off. but only in one direction, they can not read slower than the speed they are actually going. so in this case, if you haven't measured the distance with gps, you don't know if one or both of the speedos are off. probably both.

 

All speedometers in the US are set at 2 mph faster than actual speed. This is with new OEM size tires. On all the bikes with proper psi as the tire wears it will increase that ratio. When replacing tires check your speed with GPS before and after new tires were put on.

 

He isn't talking about the speedometer? Odometers are actually more accurate than speedometers that can read up to 10% high. 1.8 miles is about 2% difference. Could be weight/tire pressure/tread-wear/manufacturing tolerance?? If it bothers ya get a powervision and tune them in.

 

Harley clock runs slower and speedometer little faster when you compare to any thing runs accurately.

 

Mine reads about 8% high according to GPS. Unfortunately, the PV does not allow you to change the odometer setting, only the speedo. When I got my PV, I was hoping that when I made the speedo change it would change the odometer too. It does not.

I understand why too. People like me would turn the speedo all the down and just use a gps for speed. Hey, I would have a bike with 100 miles on it when I trade it in.

I know of no federal law for accuracy for odometers, just tampering.

 

Of all the things to worry about, this seems very low on the list. After all there is what kind of oil to use. Now that is a worry!