gocartone
Junior Member
You need to be more clear with what you are saying with RPM vs speed. Are you saying the SPEEDOMETER said 62mph at 5000rpm, and it now says 62mph at 4600rpm? Or are you saying that the GPS/radar said 62mph at 5000rpm, and now it's 62mph at 4600rpm? Did you do the test as accurately before the change as you are now?
Also remember that not all bikes are the same percentage off when coming off the assembly line, so using some numbers other people found with their bikes is not always going to be true for your bike (hell, car speedometers are +/-2.5% from the factory, a 5% difference from the low to the high side, which is 58.5mph to 61.5mph, and they are much more accurate than bike speedometers!). That's without considering how much tires vary in size from one to the next.
Also remember that not all bikes are the same percentage off when coming off the assembly line, so using some numbers other people found with their bikes is not always going to be true for your bike (hell, car speedometers are +/-2.5% from the factory, a 5% difference from the low to the high side, which is 58.5mph to 61.5mph, and they are much more accurate than bike speedometers!). That's without considering how much tires vary in size from one to the next.