It also allows you to run more PSI on the tire and still have even tire wire. With the narrow rim, the tread tends to bow up in the middle and you have to reduce pressure for even wear. This reduces the load the tire can carry. It also tendt to push the sidewall against the rim lip which means the load isn't carried on the bead in the proper area. A 10.5" tire should be on a 8-10" rim ideally, but the rim will be better protected offroading with an 8" width.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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