Will 15" x 10" wide rim with 4" backspace fit with stock rear?

[88Stanger]

I am building a 1966 short bed fleet side from the ground up and i am just wondering if a rim that is 15" x 10" wide with 4" backspace fit between the outer rear fenders? I can modify the bed and rear inner fender wells, just not sure if it will fit in between the outer fenders.
Sorry to ask, i have searched and searched and i cannot measure because the truck is completely apart.

Thanks to all who give feedback, very much appreciated.

Just a note, plan is fully bagged, tubular front a-arms, factory short bed, wood bed, fleet side, 383 full roller stroker, rebuilt muncie 4-speed and so on. build page coming....

[Captainfab]

Are you sure the BS is 4" and not 3.750"? The fitment is largely going to depend on the tire you mount on the wheel. The answer is yes a 15 x 10 wheel can work on a fleetside.

[Todd46]

Originally Posted by 88Stanger

I am building a 1966 short bed fleet side from the ground up and i am just wondering if a rim that is 15" x 10" wide with 4" backspace fit between the outer rear fenders? I can modify the bed and rear inner fender wells, just not sure if it will fit in between the outer fenders.
Sorry to ask, i have searched and searched and i cannot measure because the truck is completely apart.

Thanks to all who give feedback, very much appreciated.

Just a note, plan is fully bagged, tubular front a-arms, factory short bed, wood bed, fleet side, 383 full roller stroker, rebuilt muncie 4-speed and so on. build page coming....

Thanks for asking the question. I'm looking at the same size rims on a 62 step side

[Captainfab]

The stepsides have less room for tire and wheel than a fleetside. You will not be able to use a off the shelf 10" wide wheel on a stepside with a stock width differential, if it is lowered.

Originally Posted by Todd46

Thanks for asking the question. I'm looking at the same size rims on a 62 step side

[Todd46]

Originally Posted by Captainfab

The stepsides have less room for tire and wheel than a fleetside. You will not be able to use a off the shelf 10" wide wheel on a stepside with a stock width differential, if it is lowered.

Thanks Captain! I appreciate all the information you share.

[88Stanger]

Originally Posted by Captainfab

Are you sure the BS is 4" and not 3.750"? The fitment is largely going to depend on the tire you mount on the wheel. The answer is yes a 15 x 10 wheel can work on a fleetside.

1st, Thank you sir for the super fast shipping, and great, no wait, awesome looking adapters! Thanks for your input here also.

Summit Racing has these with 4.5" Back space
Wheel Vintiques 12 Series Smoothie Wheels 12-5005042

Summit Racing has these with 4.0" Back Space
U.S. Wheel 68 Series Rat Rod Matte Black Wheels 68-5050

But i think that i want a much taller rim but would like the width and low profile tire, but not sure it will work with a bagged out 1966 C10 Fleetside with stock rear. I understand that may need to do something with the bed inner fenders, make them wider and i am ok with that, just not sure on the outside fender.

[LostMy65]

Here is my stepside with 15x10 wheels.
http://67-72chevytrucks.com/vboard/s...85#post5455785

[88Stanger]

Originally Posted by LostMy65

Here is my stepside with 15x10 wheels.
http://67-72chevytrucks.com/vboard/s...85#post5455785

Any idea what the Backspace is?

Im trying to figure out what is the max back space i can have is.

[shortstep60]

I think you would be better off with a five inch backspace and it will work.

[LostMy65]

Here's another option:
http://67-72chevytrucks.com/vboard/s...78#post8261978

[LostMy65]

Originally Posted by 88Stanger

Any idea what the Backspace is?

Im trying to figure out what is the max back space i can have is.

Sorry, I posted the wrong link.
Here you go:
http://67-72chevytrucks.com/vboard/s...71#post6772771

[88Stanger]

Originally Posted by LostMy65

Sorry, I posted the wrong link.
Here you go:
http://67-72chevytrucks.com/vboard/s...71#post6772771

DAMN! I like the 12" rims, but if i read correctly, only 3 1/2" backspace?!?!
I would have thought that more backspace would have been better.

[shortstep60]

I have some 15x10 with a 295/50/15 with a three inch backspace and it’s way to tight.

[SCOTI]

Originally Posted by 88Stanger

I am building a 1966 short bed fleet side from the ground up and i am just wondering if a rim that is 15" x 10" wide with 4" backspace fit between the outer rear fenders? I can modify the bed and rear inner fender wells, just not sure if it will fit in between the outer fenders.
Sorry to ask, i have searched and searched and i cannot measure because the truck is completely apart.

Thanks to all who give feedback, very much appreciated.

Just a note, plan is fully bagged, tubular front a-arms, factory short bed, wood bed, fleet side, 383 full roller stroker, rebuilt muncie 4-speed and so on. build page coming....

No disrespect to the answers above but when it's on bags, things get different depending on how much is altered & how much drop it has.

My 64 short fleet has bags & the 'narrow' early truck arm 12bolt. There's NO WAY a 10" wheel w/4" BS would fit. I have 10" wide wheels w/5.5" BS & they still would not fit w/o cutting-up the inner bedside wall @ the seamed area.

In these included ride height mock-up pics, I now have a narrowed 9" housing (58" vs 62) installed. I utilized adapters to put on those 10" wheels w/5.5" BS:

[SCOTI]

I switched to the narrowed rear housing specifically to allow using a 10" wide wheel w/4" BS & not have to cut up the inner bedside. The bed is also mini-tubbed to fit the rubber.

[88Stanger]

Originally Posted by SCOTI

I switched to the narrowed rear housing specifically to allow using a 10" wide wheel w/4" BS & not have to cut up the inner bedside. The bed is also mini-tubbed to fit the rubber.

Please excuse my ignorance, but what is meant by narrow vs wide rearend?
PS thank you to all of you for these great responses.

[SCOTI]

Originally Posted by 88Stanger

Please excuse my ignorance, but what is meant by narrow vs wide rearend?
PS thank you to all of you for these great responses.

The 'early' truck 12bolts changed width as disc brakes came along. At some point in '70, the rear ends started being made 1.5" wider vs. pre-'70. So, 63-69 rear ends were the narrow 12bolt. In 1970, as production started building things for the new '71 models (that would now have standard disc brakes up front), the housings were wider width but w/6-lug axles. Starting in '71, the axles changed to 5-lug.

Since these trucks are so old & parts are easily swapped between the years, you have to pay attention to what you have & not assume just because it's 'X' year model, it will work. From what I learned:

63-64 'narrow' 12-bolt 17-spline axles
65-69 'narrow' 12-bolt 31-spline axles
70 could be either the narrow or wider by 1.5" 12-bolt 31-spline axles
71-80 'wider' 12 bolt 31-spline axles

Any of the above from 63-72 could be truck-arm or leaf housings. The additional width was outboard of the T/A or leaf mounting pads.

81-87/91 'wider' 10 or 12 bolt
In 88, the C/K GMT400 style rear housings/axles got an increase in width again by 1.5".

So, if you have a truck that has one of the possible '70 model wider housings swapped in prior to your ownership, things are different vs. something that came as factory. A buddy & I learned this the hard way (after he spent $$ on new wheels).

[joe dirt]

these are 10" wheels....unsure of backspacing tho

[SCOTI]

Originally Posted by joe dirt

these are 10" wheels....unsure of backspacing tho

Looking @ this pic, the rears don't seem 10" wide. Could just be an angle/view perspective thing. What size tires & how much/how was it dropped?
On mine, there's ~1/2" clearance out-board of the sidewall w/the stock bedside opening lip. Any mods to the one in your pic?

[joe dirt]

Originally Posted by SCOTI

Looking @ this pic, the rears don't seem 10" wide. Could just be an angle/view perspective thing. What size tires & how much/how was it dropped?
On mine, there's ~1/2" clearance out-board of the sidewall w/the stock bedside opening lip. Any mods to the one in your pic?

rear tires are 255/60/15

rear is dropped via removal of springs in the pack....( gmc truck ) unsure how much, I got it this way....


edit, I actually think these are 15x8 neg. offset now that I think about it

[SCOTI]

Originally Posted by joe dirt

rear tires are 255/60/15

rear is dropped via removal of springs in the pack....( gmc truck ) unsure how much, I got it this way....


edit, I actually think these are 15x8 neg. offset now that I think about it

It didn't seem like a 10" wide wheel. Photos on the screen are difficult to get the right view sometimes though. They looked like ~8" wheels w/about 3-3.5" BS to me. A 255 section width tire helps as that seems about right for an 8" wheel.

[LostMy65]

Originally Posted by SCOTI

It didn't seem like a 10" wide wheel. Photos on the screen are difficult to get the right view sometimes though. They looked like ~8" wheels w/about 3-3.5" BS to me. A 255 section width tire helps as that seems about right for an 8" wheel.

Here is a side by side.

[goatless]

Here's mine with 15x10, 325 50 15 Nitto drag tires. BS is 6.5". Wheels from Wheels Vintique. Probably could have done just 6" BS, or an even wider wheel.

[SCOTI]

Originally Posted by goatless

Here's mine with 15x10, 325 50 15 Nitto drag tires. BS is 6.5". Wheels from Wheels Vintique. Probably could have done just 6" BS, or an even wider wheel.

Yep..... 14" wide prob @ about 9.75"BS would be max w/a 15-16.5" wide tire.

[Cohi]

Im running these on a 66 longbed fleet. They have 5.5" backspacing. It required trimming the bed wood floor to increase the opening and widening the wheel tubs for clearance. I trimmed back the fender lips slightly.

RID-695-2173G 15x10 5.5 backspace

pics in the build thread.