what the best performance tire for stock gt rim?

 

It comes with one of the best you can buy. If you want to go a little wider you can try 255's BFG KDW or KDWS.

 

Do a search under Exterior Mods, bfg 255, there's quite a thread pertaining to your question.

 

if you want a great tire for the twisties that is very cheep check out the falken azenis, i use these on my 1991 stang and nothing can come close to its road handling.
........................Azenis RT-215 ......................

Size Load/Speed Index Item # Measuring Rim Width Approved Rim Width Overall Diameter Section Width Tread Width Tread Depth MAX PSI (Cold) MAXLoad (lbs)
195/60R14 86H 28-351-452 6.0 5.5 -7.0 23.2 7.8 6.6 8/32 51 1168
205/50R15 85V 28-352-572 6.5 5.5 -7.5 23.1 8.3 7.6 8/32 51 1135
205/55R16 89V 28-352-661 6.5 5.5 -7.5 24.9 8.3 7.6 8/32 51 1279
215/45ZR16 86‡ 28-353-693 7.0 7.0 -8.0 23.5 8.5 8.0 8/32 51 1168
225/45ZR17 90‡ 28-353-795 7.5 7.0 -8.5 24.9 9.1 8.3 8/32 51 1323
245/45ZR17 95‡ 28-353-784 8.0 7.5 -9.0 25.7 9.8 9.0 8/32 51 1521



Treadwear Traction Temperature
200 A A