Do you have to go a 80-18 and 70-17 or can you have a 150 rear 80/17 and 110 front 90/18 as per OEM ??
I am no tire expert, but I am pretty sure that would work. I guess that would largely depend on the brand. I have 70/17 and 80/18 because those were the specs based on the PR3's that I wanted. The only 150 tire they had was 70/17; there wasn't another ratio at 150.
Current Ride: 2014 Thruxton
Previous Rides: 2008 Thruxton, 2001 Yamaha SR400, 2000 SR400, 2004 HD XL1200C