Fellas- I'm working with a kart track to get supermoto going in my area... so now I need to get bike for it. I would also like to be able to use the bike for TT, flattrack, road courses, ice and occasionally some off-roading. For the most part, I'm thinking the '05 450 SMR is what I want. However, it's that "occasional off-road" has me wondering if the SMC would be a smarter choice. I'm told the '05 (and prior) SMC's come with dirt wheels. This is definitely a plus considering my dirttrack plans... but it seems the lower SMR would dirttrack better and I could find wheels on e-bay or something. The "occassional off-road" is really for my brother (I ride MX on a CR250)... a beginner/novice that would like to play once in a while. Essentially, what I want to know is: -Can I put 21"/19" wheels on an SMR or would there be bottom out issues? -How much better would the lower SMR handle super-moto and dirt track? -Is the stiffer '05 frame a significant improvement over the '03-04's? Other input would be most appreciated.