My 2013 ULtra is about 3mph off as compared to my Zumo, my old (2004) Goldwing was 5mph diff, not bad, I'm used to it, nothings perfect!!

 

Guys this thread is almost 7 years old!

 

so you're saying that this speedo problem has been with us a while?

 

I don't know about other tuners than the Power Vision, but you can adjust the pulses per mile for the speed. I would think you can also do it with others, but the PV is right there for you. I got mine down to 1MPH+/-.

 

My 2018 tri-glide speedo was off by approx 8mph, showing slower than I was actually traveling according to riding buds.

Checking with built in GPS would be IDENTICAL TO SPEEDO. A TRUE test would be a separate GPS, like a Zumo or WAZE.

I hade my 'tuner guy' Calibrate the speedo with his Techno tuner and got it dead on. It took a while to figure out why the speedo was off which threw off my RANGE as well, but we never came up with the reason that we could prove caused it.

I changed front wheel to 19", I have a 114, stage II, but??? None of this could matter or maybe yes since the speed is picked up from a sensor in the transmission, which has never been touched. Anyway I am happy I can now get accurate speed and range information.

I also know for a fact that the V&H FP3 had a calibration mode that allows you to adjust your current tune so the speedo is spot on.