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Old 06-19-2012, 06:59 PM
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Sledlvr Sledlvr is offline
Dodge Ram Forum Senior Member
Join Date: May 2012
Location: British Columbia
Age: 46
Posts: 314
Gender: Male
Vehicle: 2012 Powerwagon
Trim Level: SLT
Color: Black/Red
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Rim size , affects the overall fit of a wheel as much as the tire itself does , depending on the backspacing , it moves the wheel in or out of the wheel well , the further inside (positive offset) , more chance of the tire rubbing on suspension or inner fenders , move it out (negative offset), more chance of rubbing on the bumper or rear of the outer fender.

Rim width also makes a difference on overall height of the wheel , a narrower rim will make the tire profile slightly taller , as a wider rim will lower the profile .

Also , take into account that moving the back spacing, also changes the load on the wheel bearings , so if you pack a heavy load , you don't want to go too much positive or negative , and the larger overall diameter tires take more power to turn and more brake pressure to stop, I strongly recommend upgraded brakes for anybody going to taller/heavier tires.

And don't even get me going on getting the speedometer calibrated for the larger tires on a 2012 Ram without an aftermarket tuner/programmer that still isn't available , and nobody knows when one will be , There isn't many tire sizes programmed into the factory ECM
37x12.50 17' Super Swampers , HID's, Bullydog tuner,Catch can,Volant Powercore CAI, 4" Dynomax exhaustfor a 6.7 diesel, Kenwood TM271 65w VHF radio,240mm Lightforce Blitz HID driving lights,Custom 8'x9' aluminum sled deck
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