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- - 15x8 inch rally w/4.25 backspace (https://67-72chevytrucks.com/vboard/showthread.php?t=583336)

vjjack04

06-05-2013 08:59 PM

15x8 inch rally w/4.25 backspace

hey guys,
According to my beer math they will fit on my 55 with a 10 bolt, approx. stock width....I am trying to run a 275-60....any one with experience...?

lazypineapple

06-06-2013 06:46 AM

Re: 15x8 inch rally w/4.25 backspace

A 275 tire is 10.8" tread width that's pretty wide for an 8" wheel.
You should try to keep wheel width and tread width as close as possible.
Don't forget to factor tire bulge into your beer math too.
I bet a 275 is close to 13" wide sidewall to sidewall.
How wide is fender opening to bed wall?
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buggy5872

06-06-2013 07:38 AM

Re: 15x8 inch rally w/4.25 backspace

I ran 275-60-15 tires on 15x8 wheels for a few years on my 59 fleetside. They had 4" back spacing on a stock width rear. I did not have any issues.

meter swinger

06-06-2013 08:21 AM

Re: 15x8 inch rally w/4.25 backspace

I have 275/60/15 on the rear of mine, on a factory 4x4 (80's k10) rally wheel. Its a little snug in the rear. My bed is a fleet, which i believe is wider than a step
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vjjack04

06-06-2013 11:19 AM

Re: 15x8 inch rally w/4.25 backspace

Quote:

Originally Posted by lazypineapple (Post 6110186)

Recommended rim width from BFG is 7.5 to 9.5; tread with is reported to be 9 inches with an overall section width of 11.1 (can depend on rim width)-all according to BFG site. My concern is not as much the tire as the rim....

vjjack04

06-06-2013 11:20 AM

Re: 15x8 inch rally w/4.25 backspace

Quote:

Originally Posted by buggy5872 (Post 6110212)

I ran 275-60-15 tires on 15x8 wheels for a few years on my 59 fleetside. They had 4" back spacing on a stock width rear. I did not have any issues.

Thanks. These are 4.25 but I think they will work....we'll see anyway.

Katrina/10

06-06-2013 01:36 PM

Re: 15x8 inch rally w/4.25 backspace

I had 275/60s on the back of my 55 on 8 inch rallys, they rubbed on the fenders. I put 255/70s on it and they worked ok.

vjjack04

06-06-2013 03:08 PM

Re: 15x8 inch rally w/4.25 backspace

Quote:

Originally Posted by Katrina/10 (Post 6110641)

I had 275/60s on the back of my 55 on 8 inch rallys, they rubbed on the fenders. I put 255/70s on it and they worked ok.

Thanks. The folks at Discount tire (Locally) said the could mount the tire on the rim and test fit it and if does not work we could change to another tire (no charge for tire if it does not work). So I will keep the 255/70 in mind.

Atomsplitter

06-07-2013 11:12 PM

Re: 15x8 inch rally w/4.25 backspace

I'm running 245r65-15's on Corvette AZ code 15x8 ralleys (4" offset) on a Camaro 10 bolt and they are 1/2" from the bed and 3/8" from the fender. I have some light rub marks on the bed from cornering too! I was told the Corvette had the 4" offset and the 4.25" offset is from the Camaro?!?

mikekaye69

06-08-2013 07:19 AM

Re: 15x8 inch rally w/4.25 backspace

I have 275/60R15 on the rear of mine..

vjjack04

06-08-2013 04:09 PM

Re: 15x8 inch rally w/4.25 backspace

Quote:

Originally Posted by Atomsplitter (Post 6113036)

maybe....my wheels are from summit racing....

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