When I checked my speedo reading against my RoadAngel (Mk 1) the speedo seems to be about 10% out. Eg. it says 55, RA says 50 and the error increases as the speed goes up...
I double-checked against my TomTom and that gives the same reading as the RoadAngel, so the GPS reading seems to be true.
Is it possible to adjust anything to take out the error? I'm not too bothered, as with it reading high at least I'll be more inclined to be going too slow past the cameras rather than too fast.
Oh, the wheels are 17" Toyota due to upgrading to UK brakes.
Cheers for any help,
Ken