The SM rear wheel and rotor are a direct bolt on, no modifications required. Although, to me, the rear brake feels somewhat week on the street. Nothing like the instant stoppie power of the front.
I am running 14-42 gearing with a 110 link chain. I believe my GPS phone was indicating a crusing speed of a little over 80 MPH at 8000 RPM with this gearing. I also run 15-42 with the same chain if my friends plan on sustaining higher speeds.
And by the way, if you live somewhere with some really twisty roads, the TE510 with SM wheels is incredible.
I was surprised by how "normal" the bike felt with both 18 inch wheels. It is incredibly stable at any speed, and just carves in the corners. The DRZ I was riding with was very twitchy in comparison, and such a pig.
First real ride was on county rode '555' that contains nothing but blind corner after blind corner. Could come in to the blind corners at moderate speed with confidence, and then just role on the throttle to accelerate all the way through. The poor DRZ was coming in slow, and then didn't have the power to do much more than carry that speed through the corner. It was a total massacre