I am curious. Is there a difference in gearing between a 2012 RT and a 2012 R? I have rented an R (with the little flyscreen and panniers) for a few days while my RT is at the service for repairs after a serious hit-and-run by a wheeled crane while parked (don't we love these?), and the R is a good deal more lively at acceleration in 1st and 2nd gear from idle up to 4,000 rpm. Or is it just the difference in weight (about 20 kg less for the R) and aerodynamics, with no big fairing and screen to push through the air?