Wheel offset question.......
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More Turbo
Joined: Jan 2004
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From: Hawthorne,Ca.
Wheel offset question.......
On a 2019 F350 4 x 4.... what is the correct backspacing, or I should say..... what is the maximum backspacing or offset you would want on the wheel. I would imagine the overall width of the wheel is irrelevant. I am planning on purchasing some 20 x 9” wheels. It states 5.71 backspace with a 18 mm offset . Is that the maximum you would want to go inward on this truck ? So what is the most you want to go inward using backspace numbers or offset numbers for a 2019 F350? Thanks!........ P.S. the tires will be 38 x 13.50 x 20”.
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Joined: May 2019
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The width of the wheel is very relevant. Backspacing has always been easier for me to visualize because it doesn't change with wheel width like offset does. The OEM 20 inch wheels on our F250 are 20x8 inches. Most aftermarket wheels will be wider and have less backspacing, which will push the wheel/tire outside of the wheelwell more. Now if the wheel has too little backspacing it can cause the tires to rub on the bumper and the rear outter edge of the wheelwells. Too much backspacing and the tires can rub on steering and suspension components. For instance, our 37" Toyo's rub the radius arms at full steering lock. The wheels you mentioned would probably work great for fitting a large tire without it hanging way outside the fenders or rubbing the radius arms.
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Joined: May 2018
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I have 20x9 wheels on my truck right now with a +18mm offset. Paired with Toyo open country AT 295/65R20. No levelling kit all stock suspension. There is no rubbing and the front tires stick out of the fenders very slightly but the rear tires are pretty even with the fenders. I do not have any fender flares on my truck.
Guess it all depends on whether you want the tires to stick out or not and what size tire you plan on running? I think I read somewhere that the stock 20x8 rims have an offset of +40mm.
Guess it all depends on whether you want the tires to stick out or not and what size tire you plan on running? I think I read somewhere that the stock 20x8 rims have an offset of +40mm.
Last edited by RKlass; Jul 26, 2019 at 02:57 PM. Reason: Can't even understand my own writing
Cargo Master
Joined: Jul 2017
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The width of the wheel is very relevant. Backspacing has always been easier for me to visualize because it doesn't change with wheel width like offset does. The OEM 20 inch wheels on our F250 are 20x8 inches. Most aftermarket wheels will be wider and have less backspacing, which will push the wheel/tire outside of the wheelwell more. Now if the wheel has too little backspacing it can cause the tires to rub on the bumper and the rear outter edge of the wheelwells. Too much backspacing and the tires can rub on steering and suspension components. For instance, our 37" Toyo's rub the radius arms at full steering lock. The wheels you mentioned would probably work great for fitting a large tire without it hanging way outside the fenders or rubbing the radius arms.
Thread Starter
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More Turbo
Joined: Jan 2004
Posts: 583
Likes: 43
From: Hawthorne,Ca.
The width of the wheel is very relevant. Backspacing has always been easier for me to visualize because it doesn't change with wheel width like offset does. The OEM 20 inch wheels on our F250 are 20x8 inches. Most aftermarket wheels will be wider and have less backspacing, which will push the wheel/tire outside of the wheelwell more. Now if the wheel has too little backspacing it can cause the tires to rub on the bumper and the rear outter edge of the wheelwells. Too much backspacing and the tires can rub on steering and suspension components. For instance, our 37" Toyo's rub the radius arms at full steering lock. The wheels you mentioned would probably work great for fitting a large tire without it hanging way outside the fenders or rubbing the radius arms.
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