So I bought my Versys in June with a brand new Metzeler Z6 Roadtec interact rear (2011 date) and a partially used matching front (2010). I have ridden the bike about 5800 miles this summer and about halfway through, I replaced the front with a matching tire (2011 date).
I live in washington DC, and make two types of trips
1. Ride nice roads to nice roads
2. Ride the highway to make time to events
After a day of type 1 riding, my tires look great, just like they're supposed to, but then I ride a few hundred miles of type 2, and they start to cup.
In a pinch I rode some twisties even though cupping was visible on the rear and after a hundred miles or so I checked out my tires and they cupping was no longer visable. The tires felt fine, the handling was good, etc. so I kept riding on the tires.
Is this normal? With 5800 miles, my rear has a good bit of tread left in it, but after a long highway day shows cupping.
The whole situation makes me uncomfortable, but I don't have a ton of money or time to waste replacing my tires everytime I do a few hundred miles of superslab.
I have never noticed this with the Metzler Lasertechs I run on my airhead, or the bridgestone battlaxes I ran on my Vee Strom, or the Spitfires on my KZ750.
Any expert advice? If this is not okay, what tires can I get to avoid this problem? Do I need a harder compound?