Widest tire size to put on base 18" rims with spacers ? What size?

jchammond

You said you want wide,,,a 45F & 40 rear will work w/30mm less width on the front & if you can find the mfg. who makes them.(example 255/45/18 & 285/40/18) & if they are the same series/35,40,45.....a 20mm width differential will work & only will be 1/2" shorter in front.
it's just harder finding wider section width tires (285,295,305,315etc..) in a 40series all season.
Michelin A/S 3+ offer's a 255/45 & 285/40,,,but not sure if that's wide enough for you & they are 27" tall...you mentioned you were lowered.

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