The Stovebolt Site Forums The Parking Lot Big Bolts 8 lug 1 ton dual- wheel question

I have found a complete set of six 2005 8 lug dually GM wheels and tires, and am wondering if they will fit on my 64 C-30 dually? I seem to remember some talk about this in the past, but can't seem to find the thread. Can anyone help me on this one? Thanks!

i think the stud diameters are different so you may have to change to a 9/16" stud. not certain though. i had to on my 70 1 ton when fitting newer wheels with the clamp plates.

The back spacing on the early wheels won't let you run 235-85-R16, they rub under load. The newer wheels have a little more back spacing. Got a ticket for my tires touching and had to go to either 215 or 225 for clearance, went to the newer wheels and got to wear the new 235 out.

These Wheels have 215-85R16's mounted on them, so that shouldn't be a problem, but I have had some people tell me that the rear drum brake will hit the inside of the newer wheels?........I need to confirm this, as I need to let the guy know if I want them or not. HELP!!!!!!!

I guess the best way is to take a jack over remove yours and try one of his!!! I may have spoken to quickly, I had changed my rearend to a 78, for the better brakes. The drums are bigger on the stock rearends. Another problem is the early rearend has an additional bearing on the pinion and if the slip yoke freezes up it takes that bearing out. Common on these trucks. That is why I changed mine the larger brakes were a plus, higher gears were another plus. Sorry if I misled you.

What size brakes do you have? If the diameter is too large to fit in those 16 inch wheels they aren't going to fit.

I can't check the wheels on my truck, as they are too far away, so that option is out. Hasn't anyone out there ever tried putting these wheels on an older 1 ton?

Its been tried. The 16 inch wheels won't fit over the brake drums on a 1-ton rear axle. It will won't work if someone has swapped axles or brakes.

My 59 3800 1-ton had 18" tube-type wheels on it, and a 16" tubeless-tire wheel would not clear the brake drums. I fitted a mid-70's 14-bolt Chevy axle to an 87 Ford F-350 once, and had to run Chevy 16" tube-type wheels on the inside duals to clear the brakes on that one. I ran the 16" tubeless rims on the outside duals to keep the appearance from front to rear the same, but it took a great deal of adapting to make everything work. I had a good-condition Chevy 14 bolt, and I didn't have the $1,000.00+ to repar the Ford axle!
Jerry

Personally I'd love to find a way to run modern tires on wheels that look like the 18 inchers... But I also want modern brakes so I've upgraded to a 14-bolt on my project too.

The 8R19.5 wheels and tires are tall and skinny like the old 18" tires.
As far as the distinctive 8 lug AD 1 ton dual wheels look with all those hand holes... Perhaps some extra hand holes could be added to the new 19.5 rims. Or if the measurements on diameter and backspacing work out the original centers may fit new 19.5" rims only.

If you have an an 18" wheel measure the offset of the dish from wheel mounting surface to the rivets that attach it to the rim, and the diameter at the intersection of rim and center. I can compare those measurements to the 6X19.5" rim and the recommended dual wheel spacing for 8R19.5 tires.

Grigg

Something else to consider. A 19.5, being a drop center rim design, will have the same wheel center diameter as a 17" tube type. I've got multiple sets of each and the centers measure exactly the same. If a 16 won't clear your drums, might want to measure to make sure the 19.5 will clear. Stu

OK, so fitting 18" wheel centers in 19.5" wheels won't work at the drop center.
There are no 17" dual wheels with the distinctive 18" lots of hand hole dual wheel look that I know of.

There is still hope though chances are the backspacing won't work out even if an 18" center would fit in the 19.5" rim. So, with luck the center will intersect the rim somewhere other than the drop center (it will) and where it does fit might give correct backspacing. This is probably a long shot though.
The center could even be turned down to intersect where you need it to give proper backspacing, if there is enough material where it's needed.

Let's still find the depth measurement on the 18" wheel dish and I'll do some measuring and comparing to a 19.5" rim.

Grigg