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New Tire Question |
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Mark W. 
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Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7982 |
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 Topic: New Tire QuestionPosted: 26 Dec. 2019 at 8:18pm |
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CHUG wore a set of CO-OP 8.45 x 15 Snow and Mud grip tires all of its life with us from 1963 to 1976 in fact these are the tires I am currently using as project rollers. The new tires I am planning on using will be 235/75R-15 one set being 28.66 in D and a section width of 9.30" the other set being 28.90" in D and a section width of 9.10" Both would be mounted on 6" x 15" Wheels with the same 3.50" backspacing 0.00" offset I am wondering if I will run into any clearance problems in the Rear Wheel houses? The front as far as turning radius can easily be addressed with the turn stops. My current dilemma is the 15" wheels and needing a Tire as close to 29" tall as possible. The closest option being a 235/75R-15 unless I go with a tire suited pretty much just for offroad use. Anyone with a similar sized tire wheel combo have a clue? I am leaning towards the slightly taller/narrower ones.
Edited by Mark W. - 26 Dec. 2019 at 8:23pm |
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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Joe Friday
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Sponsor Member x 2 Joined: 26 Dec. 2010 Location: Jeep Central Status: Offline Points: 3654 |
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Posted: 26 Dec. 2019 at 9:36pm |
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Unless those measurements are YOUR measurements on your wheels, they are basically worthless.
Most manufacturers post the industry specifications for the size, and the actual size may vary depending on which of their plants they make them in, and any regional variations due to the outside supplier they use for tire ply cord. 'back in the day', Tire manufacturers published the wider end of the specification due to the consumers perception that wider was better. Also, are both tires radial? Radials are very stable in size. Bias Tires will grow depending on temperature and pressure. Be sure to check the width of the wheel they measured them on if it's a catalog. For every .5" increase in wheel width, the tire section width usually only increased by .2" One manufacturer may have used a 6" wide wheel. the other a 6.5" wide wheel. |
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Mark W.
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Sponsor Member Joined: 09 Nov. 2014 Location: Silverton, OR Status: Offline Points: 7982 |
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Posted: 26 Dec. 2019 at 10:56pm |
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Yes both Radials the only real difference between them being one a 4 ply the other a 6 ply according to the manufacturer. They are both the same tire just different spec's. So unless they used different wheels to get their measurements the spec's should relate. |
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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oldscot3
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Joined: 22 Oct. 2019 Location: texas Status: Offline Points: 545 |
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Posted: 26 Dec. 2019 at 11:13pm |
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I've seen plywood cutout circles used for mock up and clearance checking. You can attach strips of wood to the perimeter to simulate width.
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James 4:6 God resists the proud, but gives grace to the humble.
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Lee MN
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Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4950 |
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Posted: 27 Dec. 2019 at 12:47am |
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Mark, I run 235-75-15’s on 7” wide wheels, aired up to 25 lbs. they are 29” tall and standing next to a 6.00x16” ND on a stock 2A wheel they are nearly exact in height. Not sure about the backspacing of the rim itself but I’ve never had any rub issues front or back... Tires are Kelley Safari ATR I believe. I also had a Mastercraft of the same size on my 3B on a stock rim and noticed no rubbing issues there either, I believe you will not either.
Lee 
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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Steelyard Blues
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Joined: 09 Oct. 2017 Location: Reno, NV Status: Offline Points: 1498 |
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Posted: 27 Dec. 2019 at 1:28am |
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Mark,
Mine had these tires mounted on split rims when I got her. I don't have any info with me on the rim dimensions with me, but could get if you need. I do recall a bit of rubbing but only at full crank. It was not much. 235-75-15s compared to 6.00-16.   When are we going to hear that thing run? Micah
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1947 CJ2A 106327, Engine J109205, Tub 97077. Luzon Red
https://www.thecj2apage.com/forums/steelyard-blues_topic41024_post397981.html?KW=micah+movie#397981 1965 Johnson Furnace Company M416 #6-1577 |
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oldtime
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Posted: 27 Dec. 2019 at 1:35am |
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Most all early Jeep wheels are built 3/4" inset.
That simply means the tires center runs 3/4" inward of WMS. There are a few certain exceptions like the Renegade I wheels and the Gladiator wheels.
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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Mark W.
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Posted: 27 Dec. 2019 at 1:46am |
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Thanks Lee my real worries is the outer lip of the rear wheel opening. With the wider tire. Its amazing as much as I obsess over stuff. I can't think of anything that has driven me as crazy as buying tires. They are my last big purchase for CHUG and as I expect them to last 30,000+ miles going to be with me a while. Pretty much now its down to a Passenger rated tire or the same tire but in a LT rated tire.
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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Mark W.
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Posted: 27 Dec. 2019 at 2:14am |
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The tires I am looking at are free shipping if I buy 1 or 5 so I am thinking I will buy 1 get it mounted up on one of my wheels and see how I like the fit. Should it not suit me I guess I figure something else out.
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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oldscot3
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Posted: 27 Dec. 2019 at 3:15am |
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No body on of course but you get the idea, some scrap ply and drill holes. Attach strips of wood around the perimeter at 90 to correspond with the tire width and backspacing and you can turn it to see if there will be rub.  |
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James 4:6 God resists the proud, but gives grace to the humble.
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Lee MN
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Posted: 27 Dec. 2019 at 3:59am |
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Again, your not going to have an issue there!..... My tires stick out beyond the body 1-1/2” - 2”, even with my old Crown crap springs with no arch did it even come close. I’ve spent allot of time in the mountains on some very rough trails with many different Jeeps and I cannot ever remember anyone with a rub one the outer lip of the rear wheel opening. If your going to have issues it will rub on the wheelhouse on the back side of the tire with the axel bottomed on one side... If I were you, I’d go to a tire shop and find a used tire of the same size, mount it on your rim and see how it looks, yes it may not be exact but would certainly remove doubt. Spending hard earned dollars on the wrong tire size makes no sense. Lee
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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Flatfender Ben
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Posted: 27 Dec. 2019 at 4:19am |
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I’ve ran 31x10.50 r15” on my 2a and they didn’t rub the rear outer fender lip.
I’ve ran two different sets of 235x75 r15 tires on flatfenders they do rub the inner fender well when the tire is stuffed into,it but not close to the outer lip.
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1946 cj2a desert dog
1946 cj2a bulldog 1948 cj2a blue jeep 1953 cj3b yard dog 1955 willys wagon 1955 willys pickup 1956 willys pickup boomer 1960 fc 170 1968 jeepster commando 1990 Grand wagoneer |
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Joe Friday
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Posted: 27 Dec. 2019 at 4:47am |
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That is the ply rating, not the actual number of plies. Both would be 2 ply, and even of they used a heavier ply cord in the 6 ply rated, and heavier steel belts, it still wouldn't be as thick enough to account for the width difference. |
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Mark W.
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Posted: 27 Dec. 2019 at 5:10am |
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Joe in this case the 4 ply rating is the wider shorter tire the 6 ply is .200 narrower and .24 taller.
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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Mark W.
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Posted: 27 Dec. 2019 at 5:14am |
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Thanks guys sounds like I have little to worry about the tire size.
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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jeeper50
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Posted: 27 Dec. 2019 at 7:52pm |
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Not sure you will get the wear you want in your jeep, unless you rotate them every 15 minutes or 100 miles.
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Belleview ol skool winch soon. '48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers Texan at heart,Alabama by retirement |
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64CJ5
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Posted: 27 Dec. 2019 at 8:17pm |
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I had 31x10.50r15's on some spoke wheels on our M38. They did not rub, but sure did sling mud. We have gone back to original wheels with 700x15 tires.
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64CJ5 "Eeyore"
01TJ "Tigger" 52 M38 Severely demilitarized, "Popeye" The Coast Guard Jeep. 14 JK "Jake" To Trust Government Defys Both History and Reason. PUBLIC LAND Owner/User |
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Mark W.
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Posted: 27 Dec. 2019 at 9:10pm |
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Actually I plan on rotating the tires every time I drive it doesn't everyone? I see no reason why tires stated to get 55,000 miles shouldn't get at least 30K on a light weight Willys. Do keep in mind everything in my front suspension and steering (Saginaw 525 Manual single tierod and drag link) is NEW even the steering box and column is NEW so having my front tires flop around like some old worn out thing will not be a concern. I put a set of Tires rated for 40K on the wifes 67 mustang we took them off at 52K cause winter was coming and I wanted her to have better tires more then squeeze the last 8-10K out of them.
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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Mark W. wrote: