What's the Backspace for 17" wheels/ W/ 6" lift kits.

[tschreck]

I bought a set of 17"- Centerline wheels and went down to Discount Tire to have them mounted when they called. Guess what? Didn't fit, their Centerline website even stated for 17" wheels 4.75 would fit. The wheel rubbed against the brake caliper and offset the center from lining up. I'm thinking maybe 4.5 backspacing is the correct fit but maybe Centerline made some bad wheels. I don't know. Looks like I have to wait till Tuesday to get some answers.

Anyone have anything to say about Titan backspacing for 6 inch lifted trucks with 17" wheels?

Found this on another thread.
Re: KMC XD Series Wheels

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OK, can somebody tell me if these widths, offsets, and backspacing combinations will work without sticking out too far and without rubbing if I went with a fairly aggressive and large 33" tire.

They are for the KMC Hoss

Diameter | Width | Bolt | Offset | Backspace | Hub Bore
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18" 9" 6x139.7 5.71" +18mm 108mm

18" 9" 6x139.7 5.71" +18mm 78.1mm

17" 9" 6x139.7 5.71" +18mm 108mm

17" 9" 6x139.7 5.71" +18mm 78.1mm

17" 9" 6x139.7 4.53" -12mm 108mm

17" 9" 6x139.7 4.53" -12mm 78.1mm

[loufish]

It's not the backspacing, just the way the wheel is shaped and sized. There are several 17" wheels out there that rub the caliper...

[NorCal 4x4]

Originally Posted by tschreck

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OK, can somebody tell me if these widths, offsets, and backspacing combinations will work without sticking out too far and without rubbing if I went with a fairly aggressive and large 33" tire.

They are for the KMC Hoss

Diameter | Width | Bolt | Offset | Backspace | Hub Bore
-------------------------------------------------------------
17" 9" 6x139.7 5.71" +18mm 78.1mm
17" 9" 6x139.7 4.53" -12mm 78.1mm

Yeah Lou is correct.

The stock offroad rims have a 5 3/8" (5.375"), backspacing, (measured the spare under the truck with a straight edge across the rim and a tape to the mounting flange).

The offset of these rims is +30 mm. By calculation 7.5" + 1" (for the lips) is 8.5". So their center line is 4.25". Add 30mm of offset and the calculated backspacing is 5.43". Calculation is 0.055" greater than measured ... 55/1000", or less than 1/16" ... darn close.

5.71" b.s. rims' inside lip will be closer to the steering knuckle/spindle, and so are more likely to rub ... cause the tire to rub with wider tires, say like Toyo MTs. If it does, only a wheel spacer will help. Also, a wider rim allows the tire to reach a greater width, so even though this b.s. isn't that bad compared to OEM, ~5/16" more, a tire's side wall width will be 0.6" wider on a 9" rim, (half of which will stick out more at both sides of the wheel). So 5/16" plus 0.3 or another 5/16, is 5/8", (closer to the knuckle than if the same tire was mounted on the Off Road rim).

4.53" b.s. will ususally require the pinch-weld-mod at full steering lock, even with a 6" lift. My friend has the Moto Metal 951 with 4.5" b.s. and a 6" PC, with BFG 35x12.5x17 MT KMs, and he had to trim "a little". I've heard of leveled Titans with the same rims and 33" Nitto Grappler ATs in a 295/70/17 rubbing. But since you plan 33" with the lift probably very little trimming. Might look a little strange with 33s on a big lift though, since that is the stock diameter.

But the pinch-weld-mod that Kartman posted on this forum looks simple. They will stick out about 2.34" more than the stock on their outside face and about 0.845", (27/32" or almost 7/8") more than stock on their inside face.

They will give the truck more stability, due to almost a 2" wider stance, and with a lift this is good. And it will make the truck look way better too. IMO