The Stovebolt Site Forums The Parking Lot Big Bolts Dayton spoke hubs

I currently have 8.25 x 20s on my 1964 GMC 4000 with Dayton cast spokes. I have seen 22.5 radials on Dayton rims and was wondering if the rims would work with my hubs. Are all Dayton hubs the same size with just differences in the rims, or are the hubs for the larger tires themselves larger? I have plenty of clearance on both the front and rear for larger tires if they would work.

The reason is twofold: 1. Tire availability, 2. Taller tires (if 22.5 radials are taller) would give a higher cruise speed.

Thanks in advance for any advice.

Scott

There are only 2 sizes of cast spokes...20 and 22inch. 22.5 tubeless go on 20" spoke and 24.5 go on 22". The comparable tire to an 8.25x20 is a 9.00x22.5 which is almost obsolete. 10x22.5 tires are common on bobtails and 11x22.5 is pretty common. However the low pro 22.5 is the most common these days. It is about the same diameter as a 9.00x20. You will need 22.5 open center rims. 8.25 wide if you run 11.225 or 7.50 if you run 10x22.5. A few years open center wheels were every where in fact 20 years ago I had over 300 of them on the ground. However now they are getting scarce. I wish I had kept a few. You may have to get a wider spacer to run larger tires. You want to make sure the duals do not touch when you are loaded I always ran 4" wide spacers in fact I have a bunch of them in the warehouse. If you go to a wider spacer, you will need a shallower cleat. You never want a cleat to bottom out on the hub or it will slip

There is some info for you in this tech tip http://www.stovebolt.com/techtips/wheels/

In the Accuride wheel catalog you'll find some great charts on wheel and tire interchange from tube to tubeless as well as minimum dual spacing for different tire sizes. Also what size spacer rings are needed. And even what rim widths are recommended and acceptable for different tires.
http://www.accuridewheels.com/completeversion.pdf

Doesn't concern your project, but while 20" and 22" cast spoke hubs are the most common size there are smaller ones used on trailers and old pickup trucks (Diamond T and Mack for two examples). There may even be larger ones out there on equipment and really big trucks?
Edit Yep, saw some 25" Dayton's on a Pacific heavy haul truck moving a 120 ton transformer near me yesterday: here are pictures http://rides.webshots.com/album/575013958ljWmXE

Grigg

Your '64 GMC looks great with cast spoke wheels. Cast spokes make the truck look more heavy duty, especially with the wide front fenders you have. Plus I would rather change a flat on a cast spoke wheel, old buds can be difficult to remove.

I'd love to see some new pictures of your GMC...

James

[IMG]http://i615.photobucket.com/albums/tt238/joek3167/20090620_4.jpg[/IMG] does your wheels look like these

Looks like the same spokes as your truck, joek.

I'll be taking some pics this weekend for the insurance company and posting them.

It now has the cab marker/identification lights on, the bed is finished and it has already seen light use. Inspection runs out this month, and the current rears won't pass. I've gotten a quote on 8.25 x 20s of about $200 each, with new tubes and mounted, but the place giving the quote is 60 miles away, so I'll be loading the wheels into my trailer and taking them to it. I haven't done anything to the interior yet, but it doesn't need much. I still need to finish polishing the vfd lettering off the doors and hood.

Thanks for the information, Grigg, Crenwelge. I've seen 22.5 inch open rims on ebay so may go that route if I find a good deal with decent tires on them.

Scott

8.25x20 $200 a piece for the rears is about what i paid for mine