I replaced tires on my TT. Mine is a 2010 that I bought last Oct. I checked and it appeared the tires were original. They had excellent tread but the sidewalls were starting to check and I didn't want to chance a blowout on 7 year old tires. I stayed with the same size but went from a D rated to E rated tires. I bought TransMaster brand. I've only put a few hundred miles on them but no problems so far. TowMaster and TransMaster are made by Greenball tires and the reviews I read were good. Goodyear and Maxxis had good reviews also.