I made front and rear axles for a YZ out of TI and I saved a couple ounces including the aluminum axle nut I made. The stock axles are hollow. The linkage bolts are hardened so I stayed away from them. If I really wanted accomplish something I would quit drinking so much beer. Velo is right there is a big difference in tire weight and I always put in heavy tubes which weigh alot more. Those Maxxi tires weigh about 50 pounds each.