Bicycle Speedometer On Dirt Bike Can You Put A Bicycle Speedometer On A Dirt Bike?

Can you put a bicycle speedometer on a dirt bike? - bicycle speedometer on dirt bike

I have a counter case bicycle (F20 Bell Bike Computer, to be exact) and asked me if it was possible, my Dirt Bike Ride (TTR Yamaha), its 125 to be exact. I do not see a problem, except for the fact that the instructions say that the magnets must be 2 mm apart. I do not know how hard it would be my wheels are not now accessible. Thank you.