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Okay so I'm getting some 18's on my F-body, do I need to pound in the rear wheel well

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Old 02-15-2007, 03:21 PM
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Default Okay so I'm getting some 18's on my F-body, do I need to pound in the rear wheel well

I will be getting some 18X10s with a 305 sized tire in the rear of my 95 Z. I already have the jown (not sure on the spelling) spacers for the rear. I have heard that some guys have to pound in the rear inside fenders when going to an 18 inch wheel. Does anyone know if this is a must for all 18 wheels? Or is it just if you are so wide back there?

If I do need to dent in my inner wheel wells, anyone have any info on specifics of it, or better yet, pics?

Any help is greatly appreciated
Old 02-15-2007, 03:51 PM
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Its not so much the diameter of the rim but the backspacing and width of the tire/rim.
Old 02-15-2007, 03:52 PM
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depends on the offset too
Old 02-15-2007, 03:57 PM
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I can get the offset if that makes all the difference as well, but I thought I would be able to tell just by the width. So would an 18X10 wheel need pounding in of the wheel well or not?
Old 02-15-2007, 08:44 PM
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May or maynot depending on offset and backspacing
Old 02-17-2007, 06:35 PM
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Old 02-18-2007, 07:27 AM
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Thanks for the pic. It was helpful.

So, after I install the wheels, is it then that I will be able to tell if I need to get the hammer out? Or just because they don't touch once in the car, if it is close to touching, will I still need to pound some inner wheel well?
Old 02-18-2007, 07:31 AM
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On the lower area that is circled, you probably need to bend in the tab that you see at the very bottom of the circled area. IT CAUSES BLOWOUTS! I had right at 100 miles on my car, made a sharp turn and POP. That was only on the driver's side. The passenger side did not rub at all.
Old 02-18-2007, 07:42 AM
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Yikes! I'll keep that in mind!
Old 02-18-2007, 08:03 AM
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An adj. Panhard rod always helps too! I highly recommend you get one. This will help with centering the rear of the car and might help with rubbing issues.
Old 02-18-2007, 01:42 PM
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If your at stock height you'll probably not get any rubbing. I bolted on 315's with no problems. Once the car is lowered, things get tight. You'll need an adjustable PHR (preferably a rod/rod) and you may also need to roll the fender wheel lips. It just all depends on your tires and rims. Sometimes they will rub in the inner portions and you won't know it. Just jack up the car and look and you may see the rub marks. If they are only on one side then adjust the PHR to compensate. Then paint the rub marks over with black paint so you'll be able to tell if they rub next time.

If you search for a thread on installing 315's they will have all the details there as well.
Old 02-18-2007, 04:14 PM
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My car is lowered (3/4 of an inch Eibach springs), and I have a 1LE panhard rod (non adjustable). I'd like to get this done without buying too much extra. Can't I just pound in the affected areas further to better help me from rubbing? I know others with 18's that are lowered more than me (I'm sure the offset is different though) that just pounded in a bit, and have no rubbing problems.
Old 02-18-2007, 04:16 PM
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You can pick up a rod ended PHR for like $120 with high quality ends. The point of it is to minimize any rubbing or pounding in. If you center the rear properly you will either have no rubbing issues or will have minimal rubbing on both sides.
Old 02-18-2007, 04:28 PM
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The question I am asking I guess, is the easiest/cheepest way to prevent any rubbing. If it is possible to pound in the inner fender enough without having to buy the other aftermarket PHR, then thats what I would prefer to do here. If it is rubbing beyond the point of what pounding the wheel well can do, then I'll probably go and spend the money on another aftermarket PHR.
Old 02-18-2007, 04:37 PM
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I would like to have some bigger tires but I dont want to pound the wheel wells at all. Ill have hotchkis springs on and a adj phr whats the widest wheel/tire combo I can go and be sure I will have no rubbing and not have to hammer nething. If I did do some hammering whats a nice tire I can run with out it sticking out? Like a 305 maybe and with what offset?
Old 02-18-2007, 04:46 PM
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CALL911, you'll just have to put the tires on and see what can be done. Every car is different.

SpdFrk1990, probably a 275. There's no guarantee about bigger sizes. If you want a 315, the Nitto 555R drags are quite narrow. The narrowest of the 315's. As far as sticking out, that depends on the rim. Did you read the sticky at the top?
Old 02-18-2007, 04:47 PM
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I'm sure it depends on the offset of the wheel, and the width of the tire (keep in mind that just because you have a Nitto 305 wide tire, it won't necissarily be exactly the same as say a BFG 305 wide tire, since there are little variations in each tire manufacturer). Then it also totally depends on how your suspension is setup. Some suspensions will give more than others especially on load during hard acceleration. Basically, there could be counltess combos here, so unless you find someone with your exact suspension, spring/shock, wheel and tire setup, you may never know what exactly will work and what won't.

Having said this, I have never heard of anyone with a 285 or less wide tire ever rubbing. So if you stay skinnier than a 285, you should be fine. Others may be able to make it to a 305 without ever rubbing or needed to pound in the inner wheel well. While others with a 295 and a different setup might have to pound the crap out of thier inner wheel well.
Old 02-18-2007, 04:50 PM
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JasonWW, thanks for all your input. I'll probably just have to do as you say and wait to mount them up before I can tell what is fully needed here.

If when I do mount them up, and it seems as though I have a good inch clearance away from the tires and the wheel well, would this be considered as enough room? Or should I play it safe and pound away a little bit just to be safe?
Old 02-18-2007, 04:52 PM
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I like the size and offset of the stock z06 wheels but they always seems to take a lot of pounding on the wheel well.
Old 02-18-2007, 04:55 PM
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Originally Posted by CALL911
If when I do mount them up, and it seems as though I have a good inch clearance away from the tires and the wheel well, would this be considered as enough room? Or should I play it safe and pound away a little bit just to be safe?
If you have them one and on the ground and can run a finger around the areas that I showed in the pic you'll probably be OK. If you have too much space on the inside you may not have enough space on the outside and might cut the tire on the fender lip. That's why they need to be centered just right.



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