I want to get some new rubber and it looks like the rear is a "B" rated tire which has a stiffer side wall to handle extra weight, bags etc. At least this is the case for the Michelin Pilot Road 3's which I'm getting. I'd say 90% of the time I'll be riding this bike without bags and I'm am only 160 lbs on a fat day. I was advised to get the non-B tire as it would handle better in this configuration. Before I piss off the parts guy with an unusual order, has anyone else done this?