I have a 2002 XR100 that I have owned for nearly 13 years. I plan to never sell it. I have a son that will be ready for a CRF80 within the next year or so. I was thinking about buying the wheels from a CRF80 to put onto this 100 to make it low enough for him to ride rather than buying a CRF80. Has anyone done this and does it create any issues? Will the 100 front fender be OK with ther smaller 80 front wheel or will I need to buy an 80 front fender too? Also I believe the 100 uses a 428 chain. Is the 80 also a 428 or does it use a 420?