A gorgeous Spring day in Southern California. This was my second ride on the new Pirelli Diablo Rosso III's and I'm still getting used to them. They seem to have a rounder profile than the former Metzeler K3 Racetec Interact tires that came stock when I bought the RR. (The K3 is analogous to the Pirelli Supercorsa SP.) The K3's offered terrific grip on dry pavement and I love them. But because we have occasional thunderstorms even in SoCal, I decided it was worth sacrificing some performance for wet grip since the K3's are essentially a DOT approved race tire offering little in the way of wet weather traction. I'm also hoping for longer tire life with the dual compound DR3's as I only got 2200 miles on the K3's before I hit the wear indicators on the rear tire. Initially, the DR3's feel a bit slower to flick than the K3's, but are very plush, soft and grippy even before they are fully scrubbed in. Steering into and out of corners feels very linear and the DR3's inspire a lot of confidence. While I was shopping for new tires, I phoned Pirelli and compared the weight of the DR3's to the Metzeler K3 Racetecs and M7RR. The DR3's are pretty close in weight to the K3's. Sizes: 120/70ZR17 (58W), 190/55ZR17 (75W). Pirelli DR3 front 9.23 lbs., rear 14.1 lbs. |--| Metzeler K3 Racetec front 8.8 lbs., rear 13.89 lbs. Metzeler M7RR front 9.5 lbs, rear 13.77 lbs. I asked Pirelli about recommended tire pressure and they said to use whatever the bike manufacturer's owner's manual states. So I'm running 36 psi front, 42 psi rear which is what BMW recommends for the RR. In his recent review of the DR3 for Super Streetbike Magazine, Adam Waheed reported DR3 tire pressures on the track were 34/39.