I'm not sure, but I believe there are folks out there who have mounted a 200-series rear tire to replace the OEM 180. If my memory serves, there are rear tire replacements that slightly lower your highway RPM...not much, but it will gain you something, and some folks out there like that "phat" look. The "search" function will answer that question for you.
As for me (and ONLY me...) I'm waiting for Scootworks, and some folks in this forum to work some of the bugs out of the cogs and pulleys show before I look at pulling the trigger on that mod.
At 350 bucks a pop (!!), I'm not willing to hazzard a drive belt on this alternative----yet.
"Those who beat their swords into plowshares will plow for those who do not."