What are people running? I've got PR4s which the dealer set at 38/43psi, but I'm starting to suspect that this may be harder than is necessary (I recall that when I took delivery of my GS I was told to run 40/44, but subsequently settled on 34/38 as being ideal for my weight). I've just returned from a couple of days of pretty fast riding and had the bike airborne over bumps more than once. If anybody has taken the time to play about with pressures to see the difference, it will save me a bit of buggering around. I'm about 74kg soaking wet, for the record.