Join Date: Jul 2007
Location: Anaheim, CA, USA
The 2007 K1200GT is on its second set of Michelin Pilot Road 2s. I prefer Avon Storms, but I bought another set of PR2s when they were on sale ($230 for the pair). The price was too good to pass up. I wish I had bought two pairs at that price.
The original pair of PR2s yielded 9,646 miles. When I changed them out for the Avon Storms, there was enough tread left for another 1,000 to 2,000 miles. I swapped them out to have fresh rubber for a 3,000 mile trip. I am a gentle rider, and ride many more miles on slabs than twisties. The original PR2s had a "B" rear. The current set does not. I haven't noticed a difference, even when fully loaded, or (very rarely) two up.
I keep my tires at the BMW recommended pressures: 36 psi front, 42 psi rear, as displayed by the TPM. When I fill them, I start them at one or two psi over the recommended pressure, then allow them drift down to one psi under over a period of several weeks before refilling them. There is definitely a difference in feel between the high and low pressure points, despite being only 3 psi apart. When newly filled, the ride is harder and the bike "flicks" and falls into turns easier. When it is time to refill, the tires are "stickier".
The BMW factory TPMs are notorious for reading approximately 2-3 psi low compared with external pressure gauges, which matches my own experience. Thus, the true nominal tire pressures are probably around 38 and 44 psi respectively.