Posted: Fri Apr 27, 2012 6:45 am Post subject: 7:00-16 vs. 6:00-16 NDCC tires
First - hello all - I just joined. I have had many Willys Overland or Willys Motors Co. jeeps over the years, 2As two of them, two 5As, a truck, but I haven't have one for a few years. I bought a pretty nice M38 look-a-like CJ3A that is frame up (an older restoration) with a new M38 body, fenders, grill, lights, bumperetts, seats, gas tank etc. But - they had oversized tires, not monsters, but oversized. I haven't picked it up yet, but I did get him to remove those wheels and put 4 standard 16" wheels with worn out tires and include a couple extra wheels - Willys wheels are expensive. Question - there is such a big price difference 7:00-16 vs. 6:00-16, what is the difference on the jeep, is a 6:00 that much smaller in profile? Do any of you use 6:00s on your M38s? When I figure out putting pictures on this site I'll do so.
Joined: Mar 13, 2006 Posts: 1079 Location: Richburg, SC
Posted: Fri Apr 27, 2012 7:53 am Post subject:
Yeah, you wouldn't think so, but it is a pretty big difference. I just replaced my civvy Traction Kings yesterday. They are 7.50x16, but they are almost 2" taller - no air. My personal opinion is that 6.00x16 would look too small, but then again, it is basically the same body as an MB and that's what they used. _________________ Matt
1953 M38a1
1964 USMC M38a1
'51 USMC M100 trailer, '54 M100 trailer, '90 M101a1 trailer
Http://wilfreeman.wordpress.com (M38a1 build blog)
http://m38a1usmc.wordpress.com (USMC M38a1 rebuild blog)
Joined: Feb 20, 2007 Posts: 606 Location: Illinois
Posted: Fri Apr 27, 2012 8:35 am Post subject:
Below is a pic of my M38 vs my M38A1 - M38 has 7.00x16 and the A1 has non-standard 7.50x16 (were on it when I got it). The visual difference between 6.50's and the correct 7.00's for your M38 may be of the same magnitude. The CJ3A from which the M38 was derived had, I believe, 6.50's as standard. But, if you put on smaller tires than what is standard for your M38, your speedo will not read correctly. Which is the case for my M38A1 'cause it goes faster than indicated but at least I am able to keep up with traffic a little easier. P.S. I just got my M38 on the road this past winter after an extensive "mechanical refreshening" and this week checked my indicated ground speed with a hand held GPS - actual speed was about 1 or 2 mph under at 60 mph indicated. The tires are not new so tire circumferance does make a difference. In the end, the choice is yours.
Photo size edited by site administrator. Original 208K files reduced to 120K files. Let's keep the photo sizes under 125 K file size. This cuts down on the bandwidth use which the administrators pay for and keeps the post narrow enough to read all the way across in one screen width.
Joined: Aug 31, 2010 Posts: 1741 Location: SO IDAHO
Posted: Fri Apr 27, 2012 8:47 am Post subject:
Hey, Skyjeep.. there's a new rule now that a guy can have only
1 ugly old jeep--better let me take 1 before you get busted..
(just tryin to do ya a favor) _________________ keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
The reason the old bias ply tire sizes seem so large is when they are upped their cross section gets larger vertically then a more modern size low profile tire due to the aspect ratio of the tires based on group.
IE a 7.00x16 will get noticeably taller when increased in size to the next size of 7.50x16 (these have an aspect ratio in the 80 range) then will a 225/75R16 when increased to it's next size of 235/75R16.
Getting back to the original post the 6.00x16 tire for the MB/GPW was matched ok with a 4.88:1 ratio axle gearing. The M38 and CJ2A came with 5.38:1 axle ratios which were better suited to the 7.00x16 tire size.
So if you try to use 6.00x16's on your M38 the jeep will accelerate quicker, the speedo will read high and you will loose top end on the highway.
The price difference varies greatly between makes and dealers _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Joined: May 14, 2009 Posts: 972 Location: South Dakota
Posted: Fri Apr 27, 2012 12:21 pm Post subject:
I have both: 6.00 16's ND and the 7.00 16's NDCC. The smaller are on my MB WW2 Jeep. The NDCC ride noticeably softer and look right on a M38. I hate both on hard packed slippery roads. If you want to drive in snow, get Mud and snow type tread, if you want it for shows and military look, then go with the ND tires. Enjoy! John
Thanks for the info - I am pricing 7:00s - all have been in to $154-159 range. The reason I asked about 6:00s is they are $110-126 range BUT - only as NDT. I haven't found any 6:00-16 NDCCs. They make 15" but not 16". At $20 a demount and $20 a mount (if the tire guy doesn't run into any problems), I am going to buy an old Coats manual tire changer and tools, do them myself and still come out ahead. A full set (5) of Coker's 7:00-16 NDCCs shipped to me with a $9 something oversize UPS charge - the set is $830 (the best price so far). I sure would like to get them more reasonable or find used ones with 80-90% and no rot
Joined: May 14, 2009 Posts: 972 Location: South Dakota
Posted: Sat Apr 28, 2012 5:01 am Post subject:
Tires have become a real issue money wise. They go up in price everytime I price them. They charge you a disposal fee, SD has another disposal fee on your vehicle plates, and when you take them to the dump, you pay another 5 bucks each. If you paint no hunting on them and go out in the country and hang them on a fence, ------- just kidding, you may have a good idea on the tire machine if you have room. The biggest problem is getting the old beads broken loose. If you go the machine route, you may want to hunt for a used machine at a sale/auction that has the air side bead breaker. That is the only way I've been able to get my beads broken loose and even then it takes several trys. I love the looks of the goodyear NDT's pointed treads, but they are close to 200.00 each for 6.00-16's John
Joined: Mar 13, 2006 Posts: 1079 Location: Richburg, SC
Posted: Sat Apr 28, 2012 9:12 am Post subject:
I got my 7.00s for $138/ea and "correct" tubes for $16/ea from Wallace Wade. They are STA brand. All of the dealers that sell the Firestones run the same price. I got 4 tires and tubes + $91 shipping for $715. I guess I was lucky with the dismounting/mounting @ $12/corner. _________________ Matt
1953 M38a1
1964 USMC M38a1
'51 USMC M100 trailer, '54 M100 trailer, '90 M101a1 trailer
Http://wilfreeman.wordpress.com (M38a1 build blog)
http://m38a1usmc.wordpress.com (USMC M38a1 rebuild blog)
that is a little less then the Summit Tire quote (5 for $830) I have - $715 divide by 4 times 5 = $893.75 minus 5 tubes $80 = $813.75 - Was that a recent buy? - I have a quote request in to Wallace. And also at Walck - I can pick them up at Walck's and save the shipping since I am going past his place next week. If I could get them at what you did - $138 - 5 for $690 plus my 6% PA = $731 - I assume the feds have a tax too. I think there is a show at Hershey or Carlisle this weekend - that is likely why Carl Walck hasn't gotten back yet.
6:00s are about a 4-5 MPH drop @ 2000RPM (which was my comfort zone on my CJ5 and I would guess the same on this CJ2B/M38). - you would really have to wind it out to get anywhere
Joined: Mar 13, 2006 Posts: 1079 Location: Richburg, SC
Posted: Sun Apr 29, 2012 8:27 am Post subject:
Yeah, I just bought them 2 weeks ago - had them put on this past Thursday. If you can save on shipping it would be great, and maybe if you order on the phone you can save tax too - worth asking. I am happy with the STAs - when they mounted them they didn't balance them! I was pissed when I got home. I took her out on the road the other night, and they aren't really bad (better than the tires I replaced), so I'd say they are a good tire. When I get the Jeep completed I am going to drive it to the tire service place and let them take them off and balance them. _________________ Matt
1953 M38a1
1964 USMC M38a1
'51 USMC M100 trailer, '54 M100 trailer, '90 M101a1 trailer
Http://wilfreeman.wordpress.com (M38a1 build blog)
http://m38a1usmc.wordpress.com (USMC M38a1 rebuild blog)
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P.S. I just got my M38 on the road this past winter after an extensive "mechanical refreshening" and this week checked my indicated ground speed with a hand held GPS - actual speed was about 1 or 2 mph under at 60 mph indicated. The tires are not new so tire circumferance does make a difference. In the end, the choice is yours.
If you paint no hunting on them and go out in the country and hang them on a fence, ------- 
John
