This is one of my first posts so if I break some protocol please go easy on me.
I bought a set of T30GTs for my 2004 ST1300. The rear went about 7000 miles and it was bald - and I mean BALD. I would typically never wear a tire down this far but I left on a 1500 mile trip down the Blue Ridge Parkway and around VA, NC, TN and WV. When I left, I inspected the tire and it had plenty of tread left and life left in it ( I thought). I guess the heat (August and in the 90s) was too much for the tire. Plus, I was carrying a passenger, carrying a lot of corner speed and on roads that had all curves and very little straight sections - including the famous "Back of the Dragon" in southern VA. I have some on-bike video posted below. The front tire is wearing very well and has a lot of tread left after 7000 miles.
A few data points for you all:
* I always check the tire pressure before each ride and set it for 42 PSI front and rear.
* I always carry a passenger - it is rare I ride solo on this bike
* Most of my miles come from long weekend rides and little from commuting
* I am a 25+ year roadracing veteran and I carry a lot of roll speed in corners but I typically to do accelerate hard
* I got an average of 48 MPG on my 1500 mile trip down the BRP - That should tell you more about how I ride than the above statement
Photos of the rear T30GT
photos.app.goo.gl
Back of the Dragon on-bike video
Starting at Hungry Mother State Park and ending in Tazwell. 32 miles and 300+ turns they say. A very nice ride!