Tire Size Conversion
Tuned
Joined: Jun 2005
Posts: 372
Likes: 1
From: Walnut Creek, CA
The correct conversion for 6.70-15 is 205/75/15 or 215/70/15. If you have power steering I heard that the 215's will be harder to turn. Both are wider that the originals. Why do you think the 205's are too small? Is that just your opinion of how they would look or that they would physically be too small?
Roast em' if you got 'em
Joined: Mar 2005
Posts: 22,014
Likes: 9,958
From: Rio Rancho, NM
Originally Posted by seawulff
The correct conversion for 6.70-15 is 205/75/15 or 215/70/15. If you have power steering I heard that the 215's will be harder to turn. Both are wider that the originals. Why do you think the 205's are too small? Is that just your opinion of how they would look or that they would physically be too small?
This is just based on what I think looks "right"
(Take that and .50 cents and you might be able to get a coke somewhere)
Bobby
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Laughing Gas
Joined: Jan 2004
Posts: 813
Likes: 5
From: Meade, KS
Ok, I found a website: http://www.4crawler.com/Diesel/Tires.shtml that actually lists the tires I have, but they give a funky equivalence, that I'm not sure what to do with. It says that r78/15=37X12.5 Anybody know how that translates to modern tire sizing?
Thanks
Thanks
Roast em' if you got 'em
Joined: Mar 2005
Posts: 22,014
Likes: 9,958
From: Rio Rancho, NM
Originally Posted by seawulff
Bobby you are showing your age, .50 cents won't buy no stinking coke these days. Maybe you can have a sip especially if it's warm!
The tire size in question here R/78/15 doesn't make sense. As someone pointed out earlier there should be another letter on the tire in front of the "R". If I remeber right, the "R" just designates that the tire is a radial.
If you google tire conversion, or tire calculator you will find some interesting reading about all this malarky. Here are a few links;
http://www.tireguides.com/tip5.html
http://www.net-comber.com/tirecalc.html
http://www.csgnetwork.com/tireinfo4calc.html
I think you should send a PM to rhopper, the man is a tire genius
Bobby
Post Fiend
Joined: Jun 2001
Posts: 7,493
Likes: 7
From: Erie, pa
Standard F1 tires were 6.00-16 4-Ply, options were 6.00-16 6-Ply and 6.50-16 6-Ply
All were mounted on 16 x 4 1/2 Wheels
The 16 x 41/2 wheels were standard on 1948 - 1964 F1/F100
All were mounted on 16 x 4 1/2 Wheels
The 16 x 41/2 wheels were standard on 1948 - 1964 F1/F100
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Post Fiend
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From: Erie, pa
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Laughing Gas
Joined: Jan 2004
Posts: 813
Likes: 5
From: Meade, KS
I'm resigned to put this thing on hold for a few weeks. I'm in a condensed class right now, and then the regular semester starts, and it'll take a few weeks to get everything sorted out. After that I'll take the 5hr drive to go down and check everything over and get all the information I can.
I'll let you all know what I find out then. I thought this would be a quicker simpler deal--maybe I'll find that "key" when I get down there.
Thanks all!
I'll let you all know what I find out then. I thought this would be a quicker simpler deal--maybe I'll find that "key" when I get down there.
Thanks all!
Tuned
Joined: Oct 2002
Posts: 263
Likes: 0
From: ELLICOTT CITY, MD. USA
I would call Coker and ask them what size tires should be on the truck. That would be the base to start with. I would also as them what would cross over to todays sizes in a radial etc... I found them very helpful when I bought mine. Almost any 16 inch tire will fit on any 16 inch rim within reason, but it sonds like the PO might have been on a tight budget and put on whatever he could find. Whatever you do, don't run radials and non radials together.
In my youth, I had a '68 LTD station wagon and work in a service station and if someone came in and got new tires and one of the old had some life left in it, if it fit my rims, it was on my car. I ran f-78-15's with h78-15 or j78-15. I did find that with the H or J on the front, when I made a turn, the tire rubbed the fender well. Call Coker and ask them. It can't hurt
In my youth, I had a '68 LTD station wagon and work in a service station and if someone came in and got new tires and one of the old had some life left in it, if it fit my rims, it was on my car. I ran f-78-15's with h78-15 or j78-15. I did find that with the H or J on the front, when I made a turn, the tire rubbed the fender well. Call Coker and ask them. It can't hurt
Fleet Mechanic
Joined: Mar 2005
Posts: 1,511
Likes: 1
From: peyton, colorado
Blue50, that r78-15 you're refering to is a little used 4wd size. Basically a "monster mudder". Back in the day...we used to have n78,p78, and q78-15 in our product line, but no r78-15. It's just a coincidence that you found that size on that web site, it's not what we run on our trucks. The 37x12.50 means 37inches tall, with a 12.5 inch wide section. Dick's right, the oe was a 600-16, which right now means either a cheap chinese nylon trailer tire, or Coker. But lots of those old trucks got converted into whatever was around.
Posting Guru
Joined: Aug 2003
Posts: 1,243
Likes: 0
From: Michigan
Just a thought if your looking for tires for your 66 merc remember o.e. was a 15 inch tire. I'm using P215/75R15 coker w/w radials on my 54 merc. You may want to call them about the correct size.
Chuck
Chuck
Posting Guru
Joined: Jul 2001
Posts: 2,119
Likes: 2
From: Southern New Hampshire
Id be willing to bet that that R is really an F as the F78x15 was a very common OEM fiberglass bias ply in the 65-75 era and is still a popular trailer tire. I run the 14" versions on my 53 Vicky to get it lower.
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