Cross-posted from the other thread, as I thought it might help.
My findings are these:
My 17 GT pulled to the left. At 2000 miles I changed the Bridgestone OEM tires for Dunlops RS3. The pull to the left is gone, and hasn't returned in 5500 miles. Bike tracks true and perfectly straight.
I've heard reports of owners changing the tires, the pull to the left disappears and then it shows back, a few thousands of miles later.
One of the assumptions I have for this is that it depends a lot on the time the bike spends stationary, on the side stand. I ride mine daily. Maybe if the bike spends too much time on the side stand, either in a garage or showroom, the constant weight (higher than the average weight of a tourer) on the left side creates some weird changes in the tire(s).
Note, regarding tire pressure: I've played around with a slight variations in tire pressure, and that didn't affect the pull to the left situation.
Last edited by nazdravanul; 07-12-2019 at 08:32 AM.