Longer post, but take from it what you will.
I always get my tires from the same dealer because they are so inexpensive. Up until this last set of tires, I had only run into a high temp question on the Metzler ME880 once.
Every visit I end up speaking to the service manager about "correct" tire pressures because they always want to adjust my tires to what they *think* should be in them. My last visit was unique because the service manager had more time available than normal so he pulled me aside and we visited the metzler site to check the recommended pressures.
You have to be careful here. Sure enough, the dealer was able to pull up a page where metzler listed the suggested cold pressure for the ME880 "2-up heavy" as 48-50 PSI. I questioned this information, but it is on Metzler's site so we bumped the pressure up.
I have a TPMS system on the bike which shows temp's as well as the normal info. As soon as we left the dealer, we left for a day trip of approx 600 miles. About 100 miles into the trip I was a bit concerned to say the least when the thing lit up the alarm light and showed 187 degrees on the rear tire. After calling the dealer and speaking with him he did not have an answer. We decided to nix the trip and get the bike back to the dealer to check it out. They could not find an issue.
I just got back from Wingstock and she hit 190 degrees.
So this morning, I went to Metzler's site to try and find contact info to find the critical temp threshold for the tire when I stumbled on a tiny tidbit of very important information. BELOW the recommended cold tire inflation is a little note with several tire sizes listed. (you'll have to scroll down to see it) One of those sizes is the wing's. Below this tire size listing is ANOTHER recommended pressure JUST for said tires.(excerpt from the site is listed below) Low and behold, the official recommended cold pressure for the 180/60r16 ME880 is 42lbs. I just bumped the tire back to the correct pressure and will test it shortly.
Inspect what you expect. (Never fully trust the stealer to do their job correctly... it's your life on the line)
If it ain't broke, don't fix it. (I should have stayed with my known pressures)
Now I have to figure out if the tire is damaged from the high pressures & heat.
For bikes with the following rear tire sizes: 170/80-15, 180/70-15, 150/80-16, 160/80-16, 180/60R16, 180/70R16, 200/60R16, 240/50R16, 140/80-17, 160/70-17 D spec, 170/60R17, 210/50R17, 150/70-18, 180/55ZR18, 200/50R18, 210/40R18, 260/40R18, 280/35R18, 300/35R18, 260/35R21.
ME880 Rear (tires as listed above)Solo - 2 Up Heavy 42