I've done many searches on this topic, but can't find a answer. I have a plated 2003 WR450 with wheels and a complete front end off of a 2008 WR250X. The bike was built this way by the previous owner and performs great as a sumo. When I bought the bike I also got all of the original WR450 parts. I want to convert the bike to an R for dual sporting using the original WR450 wheels that I already have, but I'd like to leave the 08 WR250X frontend in place so I don't have to mess with the wiring (again, I have the original WR450 front end parts if I need them). My question is how to make the front brake caliper work with the WR450 wheel on the WR250X frontend. I have already located a spacer to replace to WR odometer gear, so I'm assuming I can make wheel work, but please enlighten me if I'm wrong! Could I use the WR450 brake caliper with the X frontend? Do I need to find an R caliper? A KX caliper? Any suggestions will greatly appreciated. I'm going to sell my X wheels and caliper, so I will not be switching the wheels back and forth.