ORIGINAL: Nobrakes

Look for a setting in the digital odo where you can change the calibration, most should have something like this. My KTM odo has a setting where you can set the front wheel size - if you are running a 17" SM wheel, it will rotate faster than a 21" dirt and throw off speed and distance. So you have the ability to set the wheel size (perimeter) in mm. I'd be surprised if the WR didn't have something similar.