Hey there, as we all know most of the races in Gran Turismo 6 are not really challenging, unless you are handicapping your car (low PP/harder tires). I was not able to find a guide where i could look up tire settings for the career races, that provide a decent challenge on the one side but also give me the possibility to still win a race on the other... I started a lot of testing and have now a good tire guideline to match the opponents speed (especially in the corners). I measured the power in kw (kilowatt) in order to make it universally adoptable: For FWD (FF) and RWD (FR) Streetcars only: below 55 kw: Comfort Hard 55 kw to 147 kw: Comfort Medium 148 kw to 220 kw: Comfort Soft 221 kw to 367 kw: Sport Hard 368 kw and more: Sport Medium For AWD Streetcars only: below 75 kw: Comfort Hard 75 kw to 170 kw: Comfort Medium 171 kw to 294 kw: Comfort Soft 295 kw to 404 kw: Sport Hard 405 kw and more: Sport Medium All Streetcars with a production date before 1979: Tires shouldn't be grippier than Comfort Soft in order to keep the original character of the cars! Beware that i did this testing with mainly stock streetcars only! Racecars need tires that are at least one step below the maximum allowed in the competition. For Arcade Mode/ Single Race Users: Always go for infinite laps (that will avoid the AI slowing down in the last laps) and keep an eye on the time, so you can have your own 5 Minute, 10 Minute, 24h or whatever races If you want to keep track on your Arcade Mode miles, just go into the car settings after the race. They will be saved without deteriorating your car. I know, all tire settings are highly subjective and are pretty much dependent on the drivers skill. Therefore they can and should be discussed.