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Re: Tire sizes for a 70 Roadrunner
[Re: skullbucket]
#892826
12/31/10 08:39 PM
12/31/10 08:39 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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This is 235/60-15 in front...
295/50-15 in the rear...
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: Tire sizes for a 70 Roadrunner
[Re: 1_WILD_RT]
#892827
12/31/10 09:38 PM
12/31/10 09:38 PM
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Joined: Jan 2003
Posts: 17,516
Las Vegas, NV
6bblgt
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,516
Las Vegas, NV
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A '70 Road Runner with 15x7" wheels would've had F60-15s from the factory. Modern equivalent would be 235/60/15s all around. 245/60/15s will fit no problem. If you go to 255/60/15s all around the front starts getting close, maybe too close depending on your ride height.  245/60/15s on the front & 275/60/15s on the rear would work for me!! IMO most 70 series tires on 7" wheels don't look right (narrow tire/wide wheel) 
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Re: Tire sizes for a 70 Roadrunner
[Re: skullbucket]
#892830
01/01/11 01:05 AM
01/01/11 01:05 AM
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Joined: Jan 2003
Posts: 17,516
Las Vegas, NV
6bblgt
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,516
Las Vegas, NV
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Quote:
A 215 is for a 6 inch rim and a 225/70 is for a 7 inch rim.
Tire manufacturers have approved wheel sizes for particular size tires, there are no hard & fast absolutes. I have a Goodyear tire engineering data brochure from '86 that has plenty of dimensions/numbers in it to aid in choosing the tires for your ride.
Under Eagle GT - they recommend:
215/70HR15 5.5"-7.5" wheels (tire has 6.64" of tread)
225/70HR15 6.0"-8.0" wheels (tire has 6.86" of tread)
I prefer more tread than wheel width, it helps to give radials the "squared off" look the Polyglas & Wide Oval tires had.
Quote:
235s are too short unless you like the light space between the tire and rim look, or rubbing every speed bump in the parking lot???
If one is going for the "High & Mighty" look, I will agree a 60 series tire on the front doesn't help the "look". "High & Mighty" needs more of a big & little combination of tires & wheels. IMO with tall & skinny tires on the front, the rears still need to be as tall or taller than the fronts.
Quote:
I would think a 275 or a 295 would be a little much for a 7 inch rim???
275s are pushing the limit on 7" wheels - they won't wear evenly but they work and look great & if you look at the Road Runner pic above the 295/50/15 rears are on 8" if not wider wheels.
Quote:
My car looks just fine with 225/70s on a 15X7 inch rim, think, think not???
You have to be happy with your car, I'd be happy with more tire, especially on the rear. Here's a pic of my brother's '68 GTX with 225/70/15s on 15x6.0 Spyder Wheels. It works but isn't ideal, the "old school" wheels are the limiting factor.
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