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#1074805 08/19/22 01:40 PM
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markg Offline OP
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i run mickey thompson sr 30x12x15 on the rear of my monte.
these have been discontinued and i cant find anything even close that is in stock anywhere.
what if i were to run a 30 inch light truck tire in the rear?
has anyone ever done this?
besides being a bit louder are there any obvious problems?
my car just wouldnt look right to me if i went to a much smaller tire in the rear.


86 ss 86 cl,330hp GM vortec cratemotor-700-r trans worked,ford 9.5 inch rear with 3-50s,custom 3 inch exhaust with flowmasters.
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Try searching for tires at this site. Best I’ve found yet.
https://tiresize.com/chart/

I did run some 28” tall BFG highway light truck all season radial way back in the day. No issues - if they were noisy I couldn’t tell over the exhaust lol.

I did a quick search and it looks like Kumho and Yokahoma still make a 265/70/15 “highway” light truck tire. It’s not as wide or quite as tall at around 29.5 x 10.8. I ran what I believe to be the equivalent 28” to those Yokahoma Geolandars on a Tahoe a few years back and they were pretty good tires. 10 times better than the uni-roll tires that were on it.

You could always go with a set of 295/65/15 ET Street S/S tires. They’re 30.3” tall and 12” sectional width. 😀



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markg Offline OP
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have any of you guys ever heard of these?
they seem to fit the bill except a little narrower.
coker tire


86 ss 86 cl,330hp GM vortec cratemotor-700-r trans worked,ford 9.5 inch rear with 3-50s,custom 3 inch exhaust with flowmasters.
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Just wanted to let you know that light truck tires (ones with LT instead of P) usually runs at much higher pressure. My DD Lincoln runs at 51 PSI (Goodyear) but my work truck runs at 80 PSI (Continental). We have various brand LT tires at work (I work at airport) but most of them run at around 80 PSI.


1986 Silver MCSS - Poly bushing and Hotchkis spring w/Bilstein, Posi w/3.73, MSD 6-AL, E-Brock 600cfm, Aluminum 2-row radiator.
1986 Black MCSS - R.I.P............Finally.
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LT usually CAN run higher pressures, and that is what gives the load capacity. Typically it is actually determined by the load range, as you can have LT tires in a lower load rating that have a 50 psi max pressure etc. Load range E generally bumps the pressure to 80 psi max. Some have a minimum pressure, but often you can run them at typical car pressures. I have Load E tires on my old Yukon that I typically run at 45 psi (factory recommended is 36, I think). When towing or loading it heavy, sometimes I'd air them up to 65 for a little better handling, but since I was nowhere near the rated load in a half ton SUV, I never had to go to 80 psi. My RV with 19.5's on the other hand is 100 psi max, 85 psi min. Anything less than that leads to belt separation and failure, even at lower loads.

Max pressure gives you max load with "ideal" max load deformation. If you are running half load, you can run half the pressure and have the same deformation, which is what causes heat and eventual failure. For similar size tires, I'd use the same pressure for an overclassed tire as I would the proper class, maybe with a little fudge thrown on top for safety margin. Hence running 45 when factory calls for ~35 and tire is capable of 80.


I haven't had any experience with Coker tires, but I haven't heard anything bad about them. I doubt they are the best performance tire, but that's not what they are trying to be. They repop classic tires to give the right look and feel, so I doubt I'd hesitate to use them on one of mine if needed.

Last edited by Hunter79764; 08/22/22 05:00 PM.

Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway
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markg Offline OP
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thank you guys


86 ss 86 cl,330hp GM vortec cratemotor-700-r trans worked,ford 9.5 inch rear with 3-50s,custom 3 inch exhaust with flowmasters.

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