Widest wheel /tire combo for 1970 Roadrunner?
#363771
07/01/09 05:58 PM
07/01/09 05:58 PM
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Anonymous
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Anonymous
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Doeas anybody know what is the widest wheel and tire combo that will fit under the rear wheel well of a stock 1970 Roadrunner? I am thinking of going with 10" wide by 15" Magnum wheels that have a 5 1/2 " backspacing.
Last edited by HemiRR70; 07/01/09 06:00 PM.
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Re: Widest wheel /tire combo for 1970 Roadrunner?
#363773
07/01/09 06:31 PM
07/01/09 06:31 PM
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Joined: Dec 2007
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So Cal
HealthServices
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I think you will have to do a final measurement because there tends to be two groups that swear one will work on the other not. The two measurement differences are in the backspace 5 inch or 5.5 backspace with 10 inch rims, because of ma Mopars tolerances it seems one will work on one car and not the other. On my 69 b body is 5.5 should work and no way will a 5 work.
Measure both side as my right is tighter.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: Widest wheel /tire combo for 1970 Roadrunner?
[Re: 1_WILD_RT]
#363775
07/02/09 12:32 PM
07/02/09 12:32 PM
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Anonymous
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Thanks for the input guys. I guess I'll have to take some measurements and go from there, but you've given me a starting point.
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Re: Widest wheel /tire combo for 1970 Roadrunner?
[Re: GTXKen]
#363777
07/02/09 01:16 PM
07/02/09 01:16 PM
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Remember also that there are some people that say that their combo is great yet when the pictures are shown; it shows a car that is three feet of the ground.  Tire choice is important too. If you take a look at the outer wheel well on these cars you will see it has a severe curve that prevents tall tires to fit inside for that nice tucked in look.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: Widest wheel /tire combo for 1970 Roadrunner?
#363779
07/02/09 04:00 PM
07/02/09 04:00 PM
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Joined: Jan 2003
Posts: 6,840
The Swamp
Sixpak
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The Swamp
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Best thing to do is to get a plumb bob, and a level, clean place to work. Measure the height of the car from the bottom of the bumper to the ground, then pull one wheel, and with a floor jack under the axle, return the car to the same height as measured off the bumper. Then take the plumb bob, and use it to mark the ground from the front edge of the outer fenderwell, the edge of the inner fenderwell, and the face of the brake drum. Measure across from the two outer marks, subtract an inch from each side for clearance and you have your max tire width. The mark off the drum face and the distance between it and the two wheelwell marks will help determine max rim width and offset.
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Re: Widest wheel /tire combo for 1970 Roadrunner?
#363780
07/02/09 04:47 PM
07/02/09 04:47 PM
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Joined: Oct 2007
Posts: 288
Birmingham, England
Mick70RR
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enthusiast
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Birmingham, England
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I have 10" Wheel Vintiques steel wheels with 5 1/2" backspacing on my 70 Road Runner. The springs are stock 40 year old 4 1/2 leafs. There were no problems with 275/60/15 Cooper Cobra's but the same size BFG drag radials rub when the car is loaded up. They also rub when the trunk is empty if I corner too fast. The BFG are much wider even though they are marked up as the same size as the Coopers. The BFG's don't hit the wheel arch lip, but rub higher up in the wheel well. I am waiting for new springs to arrive and hope they will sort it out.
1970 Road Runner
505 cid
MCH CNC ported Stealth heads
MP 528 camshaft
4 speed
GV overdrive
11.98 @ 117 on street treads
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Re: Widest wheel /tire combo for 1970 Roadrunner?
[Re: Sixpak]
#363781
07/02/09 04:52 PM
07/02/09 04:52 PM
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Quote:
Best thing to do is to get a plumb bob, and a level, clean place to work. Measure the height of the car from the bottom of the bumper to the ground, then pull one wheel, and with a floor jack under the axle, return the car to the same height as measured off the bumper. Then take the plumb bob, and use it to mark the ground from the front edge of the outer fenderwell, the edge of the inner fenderwell, and the face of the brake drum. Measure across from the two outer marks, subtract an inch from each side for clearance and you have your max tire width. The mark off the drum face and the distance between it and the two wheelwell marks will help determine max rim width and offset.
That works ok if the tires don't tuck into the fenderwell. If you look up in the fender well the outside inner fender curves inward very quickly. You can also see this inside of the trunk. This will give you a very good starting point though.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: Widest wheel /tire combo for 1970 Roadrunner?
[Re: HealthServices]
#363782
07/02/09 06:41 PM
07/02/09 06:41 PM
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Joined: May 2005
Posts: 2,295
dark side of the moon
Dougsmopars
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top fuel
Joined: May 2005
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dark side of the moon
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Plymouth has a tighter fit then Dodge. On the Doges the quarters bowed out more and you could put a bigger wheel. Also remember that Mopar rear ends are not centered. They are over more on one side. A tire that fits one side may not fit the other. These are 17X9 with 4.5 back space and 285 tires. They just fit. There's a 1/4 inch clearence on passengers side. I've changed to Magnum 500's 15X7 with BF Goodrich red lines.
Last edited by Dougsmopars; 07/02/09 06:42 PM.
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