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Wanting to run Cooper Discoverer SST Pro's on my Truck. 08 Supercrew Lariat 2wd with 2 1/2" level. Using stock 20" rims. Looking at 295/55/20 which Cooper says are 33.7"/12.3"/20. Or looking at 275/65/20 which Cooper says are 34.5"/10.9"/20. Stock tires are 275/55/20 or 31.9"/10.8"/20.
I'm thinking the 295's might be the best option? Width wise the 275's might be better, but would they be too tall for my truck with that amount of lift?
Using aftermarket wheels you can run 35s on a 4WD if the wheels follow these guidelines:
-For an 8" wide wheel the backspacing is 5.5 inches.
-For and 8.5" wide wheel the backspacing needed is 5-6 inches.
-For an 9" wide wheel the backspacing is 4.5-5.5 inches.
I just ordered a set of 295/70/18 (34.3" X 11.6") Cooper S/T Maxx tires for my 2005 FX4 Flareside Supercab. I have a 2.5" HBS leveling kit. I understand that my stock wheels will work with no rubbing, but am considering aftermarket wheels. There's no turning back once I buy them, so I need to make the right choice the first time.
Is there anyone here who has used the same tires and can steer me to an exact width and offset/backspacing? If I go by the suggestions above, should I err to one side of the backspacing range or the other to be safe?
I just installed the 275/70/18 Falken Wildpeak AT3W's with some 18x9 Method Racing Mesh Wheels. Fit is perfect. No rubbing, no matter what I do, full lock to lock steering even off camber. This is with a 2" Autospring leveling kit in front. Here are a couple of crummy pics
how are you liking those tires so far? Looking at getting those in the next month or so.
As long as you stay with a positive off set close to stock you will be fine.. I believe stock was +44
Do you mean close to +44 regardless of wheel width? The above recommendations for an 8.5" wheel are to stay between 5 and 6 inches of backspacing. Here's an example:
It has a backspacing of 5.730", but an offset of only +25mm. This confuses me, as by my figuring, the centerline of an 8.5" wheel is 4.25". Subtract 4.25" from the 5.730" backspacing, and it leaves 1.48". Isn't that 1.48" the offset, which would be 37.592mm?
You measure from the mounting surface of the wheel out to the lip.
Backspace is measured by laying a straight edge across the back of a wheel and measuring perpendicular down to the mounting surface, but the centerline of a wheel is measured inside the lips?
Which should I look for in a wheel, backspacing or offset? I've always assumed that all wheels of the same width and backspacing would have the same offset as well. Is this assumption incorrect? If you have two 9" wheels with 5" backspacing, can they have different offsets?
No.. Think of it as moving the mounting surface in and out. Offset and backspacing are similar measurements. While backspacing is the distance between the back of the rim flange and the hub mounting surface, offset is the distance between the centerline of the wheel and the hub mounting surface. Measured in millimeters, offset is the measurement of choice for many custom wheel manufacturers.
Thanks for the response! Then my understanding of the relationship between backspacing and offset was correct. My confusion was created by the fact that the centerline is not measured from the same rearward point as backspacing, thus throwing off my offset figures.
To compound matters, some wheels are listed by backspacing, while others are listed by offset. I'm not sure that I see a way to convert one to the other.
EDIT: I guess there are backspacing/offset charts.
01-26-2017, 11:27 PM
