I just got a 1981 GS450L that has ben "cafe-ed" and want to "scramble" it. my question is can i change the stock 16/19 wheels for 17/17 with better brakes on the cheap? barring that 17/18 maybe? i would not be opposed to keeping the rear drum brake, but would like to fit a larger front rotor if possible. plan on getting Shinko 705s if I can. with the stock setup all I can fit is Bridgestone Trailwings. that isn't necessarily a problem, except they cost more and get worse reviews. I will be taking this thing on dirt roads and mild off-roading, not trying to make a "dirtbike" but I want it to be more than looks.