15x10 Rally Wheel - Fitment?

[72malibu]

I want to put 15x10s on the rear of a 75 C10, no suspension mods.

What backspace should I be looking for, for the best look and fitment?

(I'm planning to use a pair of NOS 15x8s in the front, 4.5 backspace).

[Wikid61]

Several sizes. You can bolt the stock 8" on the rear & measure how far inboard you can go, 2". Or go inboard 1" & outward 1 inch. Is 15x10 the only option? Going in 1.5 inch & out 1.5 for a 15x11.

[Loco83]

I'm running 15x10 Rallys on the back of my 83 with a 5" BS and 295/50 TA's, no rubbing, also 15x8 on the front with 4" BS.

[72malibu]

Thanks. I think all the OEM 15x8 truck rally wheels were 4.5 backspace if I'm not mistaken. I'm just going to use a pair of those for the front, probably with 245/60 tires.

The 15x10 is obviously custom. I've seen used pairs with 4.5 backspace but I know that Wheel Vintiques used to sell them with 5 backspace too. I'm looking at a pair of used 15x10s this weekend and will check the backspacing on them. I think if they are either 4.5 or 5 backspace they should work, especially since this truck isn't lowered. Probably with 295/50 tires. That should result in the same sidewall height and bulge front and rear.

[Loco83]

Agree, I'm also running a 245/60 TA on the front.

[72malibu]

Originally Posted by Loco83

Agree, I'm also running a 245/60 TA on the front.

Looks perfect!

[Loco83]

Another view from the front.

[72malibu]

Originally Posted by Loco83

Another view from the front.

Where did you get your trim rings? Those are the style I'm planning to use.

[Loco83]

I ordered my whole tire and rim pkg from Jegs, I like the look of the narrow trim rings.
https://www.jegs.com/i/JEGS/555/681501/10002/-1

[3drburb]

245/60/15 on 15x8 and 295/50/15 on 15x10 will be to short on a truck that is not lowered a lot.

[72malibu]

Originally Posted by 3drburb

245/60/15 on 15x8 and 295/50/15 on 15x10 will be to short on a truck that is not lowered a lot.

Well that's a good point. This one isn't going to get lowered, at least not anytime soon.

The 295/50/15 are 26.7" tall. I probably should be looking at a 28" tire, right?

I don't think there are many (any?) good options for a 295/55 or 295/60 tire.

Maybe I ought to be looking at 15x8 in the rear with 275/60 tires (28") and something narrower but as tall in the front.

[3drburb]

Originally Posted by 72malibu

Well that's a good point. This one isn't going to get lowered, at least not anytime soon.

The 295/50/15 are 26.7" tall. I probably should be looking at a 28" tire, right?

I don't think there are many (any?) good options for a 295/55 or 295/60 tire.

Maybe I ought to be looking at 15x8 in the rear with 275/60 tires (28") and something narrower but as tall in the front.

Yes, I wouldn't go shorter than 28" at stock height, also the 15x8 all around with the same tire size so you can rotate them.

There may be a thread on here with 15" wheels and tires sizes to help give you a better visual.

[72malibu]

Originally Posted by 3drburb

Yes, I wouldn't go shorter than 28" at stock height, also the 15x8 all around with the same tire size so you can rotate them.

There may be a thread on here with 15" wheels and tires sizes to help give you a better visual.

I'm not worried at all about rotating - I'm restoring the truck for my 85-year old father and it won't be a daily driver. I've got staggered wheels on my own Chevelle for the look.

I'd like to go as wide as I reasonably can in the rear, which I think would be a 275 on an 8" wheel without looking too bulgy. I don't think there's clearance in the front for that with a factory 4.5 backspace on an 8" wheel but could be wrong. Guessing a 245 is in the ballpark. Will look at some other threads.

[3drburb]

Originally Posted by 72malibu

I'm not worried at all about rotating - I'm restoring the truck for my 85-year old father and it won't be a daily driver. I've got staggered wheels on my own Chevelle for the look.

I'd like to go as wide as I reasonably can in the rear, which I think would be a 275 on an 8" wheel without looking too bulgy. I don't think there's clearance in the front for that with a factory 4.5 backspace on an 8" wheel but could be wrong. Guessing a 245 is in the ballpark. Will look at some other threads.

Got it.
255/60/15 front and 275/ 60 rear should be taller on 15x8 all around, just another choice.

Btw, what is the stock height ground to fender lip on a Square?

[72malibu]

Hmm, maybe even 255/70s all the way around (29" tall). It's a long bed (Gentleman Jim).