[trdmaster]

okay obviously u dont know anything about tires

the original size is 45x17
changing it to 40x17 will alter ur speedomotor, HELLO!!!
40 size tires are ment for 18's

45x17
40x18
35x19

tires get smaller as the rim gets bigger, duh...i have friends that work at tire shops, do ur HW and learn, let it sit in ur head a little