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15 Inch Rim Fitment Problems

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Old 04-24-2014, 05:19 PM
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Default 15 Inch Rim Fitment Problems

Hey guys,

So i recently got my hands on some new rims. they came from the factory with a yellow lip but the entire rim has now been painted black. The rim has ben mounted on a BFG drag radial, 325/50/15. Heres the rim specs:

Wheel Diameter:15 in.
Wheel Width (in):10.000 in.
Backspacing (in):6.000 in.
Offset:+13.00mm
Wheel Construction:2-piece
Lug Nut Seat Style:Conical seat - 45 degree
Hub Centric:No
Center Bore Diameter (in):3.090 in.
Center Bore Diameter (mm):78.49mm
Wheel Bolt Pattern:5 x 4 3/4 in.

I have stock brakes in the rear. The rim hits the caliper when being attempted to be mounted on the car. I do not know if i can shave the caliper enough to fit the rim on. I do not however want to shave the caliper too much and loose its strength/integrity. The stock rotor diameter is 12.010 inches. I'm thinking a 11 inch rotor with new calipers would work GREAT. Cannot seem to find one though... I was wondering if any of you had advice on this problem or had a good solution. Thanks

Patrick
Old 04-25-2014, 12:51 AM
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Wrong backspace for 15x10 wheel. U want 7.5" if you're on stock rearend length.
Old 04-25-2014, 01:09 AM
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Yup on wrong backspacing. And what wheel?

Btw, you should always mount the wheel first to check fitment before mounting the tire. A lot of places won't exchange a wheel that's had a tire mounted.
Old 04-25-2014, 01:34 AM
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Yup, wrong back space wheel, but I dunno if lt1 brakes will help your situation. Wheel will still stick out about 1 1/2"
Old 04-28-2014, 05:23 PM
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Default Thanks guys

I knew it was the wrong backspacing when i bought them. My next option was ~$250 a piece weld or darkstar rims. these were $70 a piece. But the backspacing, I knew that the tires would stick out a little and thats okay. Tires will just be on for the summer. Tomorrow at 8 AM a shop is going to look at if they can grind the calipers down safely or if I will have to buy a smaller rotor/caliper, or even an entirely new rim all together. THe shop is pretty confident they will get the wheels to ft.

15 Inch Rim Fitment Problems-photo-3-3.jpg

15 Inch Rim Fitment Problems-photo-4-2.jpg
Old 04-29-2014, 10:41 AM
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***UPDATE***

The rims do not appear to fit whatsoever even after caliper grinding. I could remove the rear brakes and have my tires on no problem at all .

My next step is to get a rim that fits right out of the box. I know Weld RT and RTS wheels do this so I will look in that direction. Keep in mind i need to find a rim that fits my 325/50/15 BFG Drag Radial. Looking into 15x10 rims with 7.5 backspacing or maybe a 6.5-7.0 backspacing if i can save a little money while sacrificing my looks a little. I also want a black Rim to match my current C4 ZR1 rims i have all around and they will be staying up front. If some of you have any knowledge on this or have done something similar, OR have pictures of a 15x10 Weld rim on a 325 tire, PLEASE SHARE.

I learned the hard way by trying to cut corners and buy a cheap rim. Now ill be having to pay extra in the long run to get rims that fit right. Live and learn!
Old 04-30-2014, 03:08 PM
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Currently looking into Racestar, Darkstar Rims for the rear.

http://www.summitracing.com/parts/rce-92-510254dsd

15x10 Rim with 7.25 backspacing.

backspacing for stock look on a 10 inch wide rim is 7.5 so this will be pretty close. Ive read on a few other threads that the rims SOMETIMES require some grinding of the calipers. On the fins. How much grinding exactly do they require? It would be great to know before I order the rims. Again, the tires being mounted on are 325/50/15 BFG Drag Radials which are 28 Inch tall by 13 Inch wide. I could use a spacer if necessary to clear more if needed. I might need to BFH mod or roll my fender a bit but thats a different story. For now i need to make sure the damn rims fit! Car is a 98 Ls1 TA by the way
Old 05-01-2014, 02:17 AM
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Originally Posted by Ptaylor459
Currently looking into Racestar, Darkstar Rims for the rear.

http://www.summitracing.com/parts/rce-92-510254dsd

15x10 Rim with 7.25 backspacing.

backspacing for stock look on a 10 inch wide rim is 7.5 so this will be pretty close. Ive read on a few other threads that the rims SOMETIMES require some grinding of the calipers. On the fins. How much grinding exactly do they require? It would be great to know before I order the rims. Again, the tires being mounted on are 325/50/15 BFG Drag Radials which are 28 Inch tall by 13 Inch wide. I could use a spacer if necessary to clear more if needed. I might need to BFH mod or roll my fender a bit but thats a different story. For now i need to make sure the damn rims fit! Car is a 98 Ls1 TA by the way
this is mine but its a narrowed 3" off each side. Weld RTS med pad 15x10 4.5" backspacing, minimal grinding on the rear caliper. tire is 28x11.50x15 I think the 325/50/15 is about 28x12.50x15. but since mine is a bias ply tire it does have more sidewall bulge then a radial tire.
Attached Thumbnails 15 Inch Rim Fitment Problems-weld-rts.jpg  
Old 10-01-2017, 01:47 PM
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Does anyone know the exact radius from the center of the axle to the outer edge of the caliper? Trying to help a friend...

Andrew



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