Trying to see if the wheels I have are right. They were in the back of my 74 D100 look like stock steelies, but only measure out to 15 x 5.5. I always heard the stock wheels were 15x7.
Is this what came on these truck stock?

My 73 club cab still has the stock wheels, and has always ran 235/75-15 tire which are 9.25" wide, can't imagine those tires on a 5.5" wide wheel. I never actually measured wheel width on that truck.

Just seeing if anyone else can confirm a measurement and if these wheels aren't what came on the truck, what they did come on.

Doesn't it say on the door sticker (or in the glove box, where ever they put it)?

A 74 D 100 could have been a pretty light duty truck. A standard cab, slant 6, 3 speed manual, with the standard suspension would not have come with 235 x 75 x 15 tires., maybe an F 78 x 15 or a G 78 x 15, and those tires fit on a pretty narrow wheel.
I though I remembered something about a 15" x 6" wheel, but a 5.5" wide would not have been out of the realm of possibilities.
You would probably need an owners manual, or a sales brochure to be sure, but I know many truck wheels were more narrow then a 15" x 7".

I have no proof though, I have a FSM for 74 Dodge trucks, but I don't see any reference for wheel width. Gene

i think i measured the wheels i took off my m880 at 16.5x7"

wouldn't be surprised if a d100 had a 5.5" wide wheel...

its a standard cab, long bed 318 with the automatic. I never thought of looking in the owner's manual. I actually have the one for my 73 still. Next time I open the glove box I will check it out.

I was just going to get this set of wheels blasted and repainted with some new tires and put them on my 73, but was surprised by the width. I didn't want to go down tire sizes. I might just play it safe and pull the wheels off the 73 and redo them, just let it sit on blocks for a bit.

15X7 would not have been standard let alone common on a half ton.
Maybe on a LRE
Neither would a 235 75 15 as mentioned.
I have 235 75 15 tires on stock rims on a 78 D150 and they fit and look fine.
I have 215 75 15 on my B 200 van and think they should be bigger.
I would suspect the 5.5 to be correct.
I have a lot of old 15" rims and all are 15 X 5.5 or 6
A 7 inch rim was where the after market rims started to get bigger in the 70's

The word of the day was the tire should be no more than 3"s wider then the wheel. Most folks chose to disregard this advice. So a short 10 inch tire on a 7" rim was common. From what I have read recently, radials could go wider and the 3" rule was for bias tires.

I had some 10 inch wide BFGs on stock 14 X 5.5 rims. The looked swollen but fit fine in the back of my 68 Fury. Those had small wheel wells.