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Old 06-13-2011, 02:52 PM
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Join Date: Jun 2011
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Beanz is on a distinguished road
Another Fender Flare Question!

I have searched and read lots of threads and tons of posts but I'm still unsure.

2001 Wrangler Sport 4.0 (TJ) 5-speed w/ 2" Old Man Emu lift and 1" Body Performance Accessories Lift Kit
I understand backspacing as the distance from the mounting surface to the inside lip of the wheel. So; If my 15" x 10" Mickey Thompson Signature Series Classic II's have a bs of
3 5/8" I'm assuming that I have 6 3/8" (10" - 3 5/8") of wheel in front of the mounting surface.

Now; my 33" x 12.5" x 15" Yokohama Geolanders are 2 1/2" wider than my wheels - so I'd assume that 1 1/4" would protrude further from the back lip of the wheel, and 1 1/4" would protrude further from the front lip of the wheel. If I add this to the 6 3/8" in front of the mounting surface - I will have approximately 7 5/8" of tire in front of the mounting surface. How much of this is actually sticking out from the fender (forget the flares for now)?

Is the mounting surface used to figure the backspacing in line (vertically) with the edge of the fender? If so; then I'd need over a 7" flare to cover my tires! That's crazy! I'm not sure I would want to go w/ 7" flares or pursue 8" wheels with more backspacing - or even if 12.5" tire will work at all (and I know that I can't go less than my 12.5" tire width with a 10" wheel).

If the mounting surface used for the backspacing calculations is not in line with the edge of the fender - where is it in relation to the fender's edge?

I don't have my Jeep with me right now to simply measure the width of the tire sticking out from the existing fender (or flares) - and I'm trying to narrow down what size flares I'll need to stay legal in PA. Of course, I won't order until I actually measure what I have - but it'd be nice to be able to figure it out mathematically

Thank you,

~ Rick M.
perpetually confused
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Old 06-13-2011, 03:53 PM   #2
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Hello Rick,

The measurements you have listed seem to be pretty close to the results you'll get. The tires will need a 7 inch flare to cover the tread itself, but some of the side wall will be out past the edge. Usually in PA, as long as the tread is covered, you shouldn't get bothered. However, this can be easily arguable by a police officer. I'd suggest checking with your local municipality to see if you and your jeep would be okay for a little bit of sidewall passing the flare line.

Here in West Chester, PA we rarely get bothered unless the tires are well exceeding the flares.

Hope this helps! Have a good one!

Quadratec Web Team

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Old 06-16-2011, 12:36 PM
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Thank you Q. I measured at the Jeep and while my math is correct -- real life measurements show that 6 1/2" will cover completely (right at the edge of the tread).

The only 6.5" Flares that I found are Bestop's Highrock 4x4 Flares. Any thoughts on their quality, looks, ease of installation, and paintability?

Any discounts @ Quadratech on these flares going on right now?

Thanks again for the information,

~ Rick M.
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