33/12.50-15's on 8" Rally Wheels fit a stock K10 ?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

440sixpack

Full Access Member
Joined
Mar 13, 2019
Posts
69
Reaction score
88
Location
Prineville, Oregon
First Name
dean
Truck Year
1977
Truck Model
k10
Engine Size
350
I have 10.50's on my wheels now and they're a little lacking on looks. I was planning to go with 11.50's but I'm wondering if 12'50's may be an option.

I have a '77 K10 with new stock springs and leveled a bit in the front. it's not jacked up . will 12.50's fit okay and will they look okay I don't want them hanging outside the fender well more than a tiny bit a better yet not at all. wheels are 8" rally's . I don't care about serious off roading clearance it's more of a road princess.

pictures would help if anyone has any.
 

Goldie Driver

Full Access Member
Joined
Mar 19, 2018
Posts
4,042
Reaction score
6,634
Location
Houston, Texas
First Name
Britt
Truck Year
1980
Truck Model
GMC K1500 Suburban
Engine Size
350
Old tire pic.

Yes, 33 x 12.50 x 15s will fit a 8 inch ralley wheel.

My old 77 Sub ran them at stock height no problem.
.This Sub has a 4 inch lift that I suspect has sagged some.



You must be registered for see images attach



I assume you have 31s now - 32s are typically 11.5 wide but are more expensive from what I have seen than 33s.
 

440sixpack

Full Access Member
Joined
Mar 13, 2019
Posts
69
Reaction score
88
Location
Prineville, Oregon
First Name
dean
Truck Year
1977
Truck Model
k10
Engine Size
350
Yes and there are less choices in the 32 11.50's as well. do you think without a lift the 12.50's would be a problem ?
 

Goldie Driver

Full Access Member
Joined
Mar 19, 2018
Posts
4,042
Reaction score
6,634
Location
Houston, Texas
First Name
Britt
Truck Year
1980
Truck Model
GMC K1500 Suburban
Engine Size
350
Yes and there are less choices in the 32 11.50's as well. do you think without a lift the 12.50's would be a problem ?


You may have some rub when turning, but maybe not.

My old 77 did not. But, its springs were not 44 years old at the time, either.

Maybe they will let you mount the fronts up and give it a try ?

Discount usually has some time period where you can try them and return them if you dont like them .

Can't hurt to ask.
 

440sixpack

Full Access Member
Joined
Mar 13, 2019
Posts
69
Reaction score
88
Location
Prineville, Oregon
First Name
dean
Truck Year
1977
Truck Model
k10
Engine Size
350
That's a possibility.

In the picture it looks like the front tires are outside the wheel well a bit, maybe it's because the wheel is turned a little. I'm wanting to avoid that since there's so much rock on the road in this country it would blast the paint even worse than normal.
 

Dooley

Full Access Member
Joined
Mar 19, 2014
Posts
377
Reaction score
987
Location
North Coast
First Name
RW
Truck Year
1988
Truck Model
V30
Engine Size
454
Don't let the looks fool you as this truck is a 1980 K10.
Changed the cab and the front clip came with it many years ago.
33/12.50-15's work great and ran them on 1/2 ton square body all the way back to 1973 and up without problems with stock suspension.
They used to rub when turning hard right if running board equipped.

You must be registered for see images attach


You must be registered for see images attach
 
Last edited:

Goldie Driver

Full Access Member
Joined
Mar 19, 2018
Posts
4,042
Reaction score
6,634
Location
Houston, Texas
First Name
Britt
Truck Year
1980
Truck Model
GMC K1500 Suburban
Engine Size
350
3 up close front shots of the Cooper Evolution M/Ts which I think are a bit narrower than the old Kumhos.

Same 33 x 12.50 x 15 size, however.

:33:

You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
 

78C10BigTen

Full Access Member
Joined
Apr 12, 2017
Posts
15,948
Reaction score
25,338
Location
pennsylvannia
First Name
Ted
Truck Year
1978
Truck Model
C10 BIG TEN
Engine Size
350
3 up close front shots of the Cooper Evolution M/Ts which I think are a bit narrower than the old Kumhos.

Same 33 x 12.50 x 15 size, however.

:33:

You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
Those tires are the cats ass!!!:rotflmao:
 

440sixpack

Full Access Member
Joined
Mar 13, 2019
Posts
69
Reaction score
88
Location
Prineville, Oregon
First Name
dean
Truck Year
1977
Truck Model
k10
Engine Size
350
Those do look good. I don't care about tread wear as little as I drive it but do those drive half decent ? I'm sure they're noisy but that comes with tires like that.
 

Goldie Driver

Full Access Member
Joined
Mar 19, 2018
Posts
4,042
Reaction score
6,634
Location
Houston, Texas
First Name
Britt
Truck Year
1980
Truck Model
GMC K1500 Suburban
Engine Size
350
Those do look good. I don't care about tread wear as little as I drive it but do those drive half decent ? I'm sure they're noisy but that comes with tires like that.

These are still under 1K in mileage and really quiet.

Not like I autocross with Goldie, but I think they handle well and have good wet weather traction.

Pretty pleased so far. I mainly wanted you to be able to see the side view and width since that seemed to be your biggest concern.

If 32s weren't more expensive I might have gone with them for a change.

That's what our 4RUNNER has in metric form :
265 75 R 16.

Not sure there is a metric 15 inch equal.
 

440sixpack

Full Access Member
Joined
Mar 13, 2019
Posts
69
Reaction score
88
Location
Prineville, Oregon
First Name
dean
Truck Year
1977
Truck Model
k10
Engine Size
350
The 32's are much less popular and much less to choose from. I may go with them in the end though because I'm trying for a modified Dessert Rat look and the 32's are bigger than stock but not overwhelming. the 31's I have now just seem a little wimpy.

I have a '77 Silverado K10 SWB with a two tone santa fe tan and white so I'll never have a clone. but I do have the Hickey brush gaurd and I found a roll bar that will all be painted tan so with a little imagination it'll sort of give that look. thinking about 15x8 white mojocks and painting them tan with center caps and trim rings as the desert fox had too.
 

440sixpack

Full Access Member
Joined
Mar 13, 2019
Posts
69
Reaction score
88
Location
Prineville, Oregon
First Name
dean
Truck Year
1977
Truck Model
k10
Engine Size
350
Pretty similar. my '77 tan is darker than that but the same paint scheme. I can't believe that sold for that price it's nice but I don't see it.

Those must be 35's ? way too big for my taste .
 

FireTruck1984

Full Access Member
Joined
Jan 7, 2019
Posts
2,986
Reaction score
9,923
Location
Michigan
First Name
Ted
Truck Year
1984 and 1984
Truck Model
High Sierra K1500 350. Sierra Classic C1500 305.
Engine Size
350, 305
Pretty similar. my '77 tan is darker than that but the same paint scheme. I can't believe that sold for that price it's nice but I don't see it.

Those must be 35's ? way too big for my taste .
No, That truck is wearing 33” 12.5 and a 4” lift
 

FireTruck1984

Full Access Member
Joined
Jan 7, 2019
Posts
2,986
Reaction score
9,923
Location
Michigan
First Name
Ted
Truck Year
1984 and 1984
Truck Model
High Sierra K1500 350. Sierra Classic C1500 305.
Engine Size
350, 305
Pretty similar. my '77 tan is darker than that but the same paint scheme. I can't believe that sold for that price it's nice but I don't see it.

Those must be 35's ? way too big for my taste .
Here’s my ‘84 33” 10.5 / no lift. 12.5s on a street truck makes no sense and looks odd and they’re noisy. IMO
You must be registered for see images attach
 

Latest posts

Forum statistics

Threads
44,157
Posts
950,585
Members
36,271
Latest member
jstewart7501
Top