I've run Metzeler 880's and then the 888's on three K1200LT's - 2000, 2002 and 2009 (still riding this one) - for a total of 140,000 miles. Probably 60% of that was 2 up. Never any problem except for whining in the corners (the tires) as they got up in miles. However, on the F6b I liked the OEM Bridgestone's a lot and used them again when it came time to replace them at 12,500 on the rear and 14,000 on the front. There was probably 1,500 - 2,000 more miles left in them to the wear bars, but I never run M/C tires that far down.