I'm running Michelin Pilot Road 3's on my 2004 R1150RT. The new regular Pilot Road 4 does not come in my rear wheel size. The PR 4 GT does but it has a stiffer sidewall for two up heavily loaded riding. I like the compliant ride of the PR3 rear tire as I ride one up. I'll probably go with the PR3 front and back, but I was giving some thought to going to the PR4 front to get the better braking and rain riding. Has anybody gone that route? I've asked Michelin, but they have not gotten back to me yet.