Originally Posted by ninepeaks9
I can't comment on the difference b/n 12GS and 12R but I can on 12RT and 12R. There's a world of difference b/n the two. While still powerful in its own right, RT didn't compare with R in how the power's delivered to the wheels. Same motor but the difference of 100 lbs of so in curb weight is very noticeable which makes the R a much more exciting ride.
With equal gas and side cases removed from the RT, I bet the weight delta is more like 50 lbs...still signficant.