Hi just wondering what size Wheel I will be able to go up to for the KLX125. I’m decently tall and would like to in some way make the the height of the bike a bit taller.

 

You need to verify if there is room for the larger wheels. Figure out what the wheel travel is, then measure from the tire to the inside of the fender. Subtract the travel from that clearance to see what remains. You might be able to go up a bit on the rim size.