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Tire Question

Discussion in 'Early CJ-5 and CJ-6 Tech' started by SpeyRod, Oct 24, 2018.

  1. Oct 24, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
    Joined:
    Jul 25, 2018
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    34
    My rig currently has 3 different tires, 4 if you count the spare. The spare is 15 12.5 35” and the rolling tires are 15 x 32’s. The gearing is obviously set for the 35’s as first is unusable and I can barely hit 55 in 4th.

    I would like to replace the oddballs with more appropriate sized tires. I have always been a fan of tall & skinny tires. What are people running in the 35” range that are tall & skinny. I am not opposed to changing out wheels.

    Thanks!
     
  2. Oct 25, 2018
    supertrooper

    supertrooper Member

    moreno valley, ca
    Joined:
    Nov 12, 2007
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    Super swamper makes a 34x9.5 tire but the tread is kinda aggressive.
     
  3. Oct 25, 2018
    Chilly

    Chilly Active Member 2019 Sponsor

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    Three different tires. So only one of them is the same?

    You probably noticed that all the cool kids have tall rims now. 15" tires are apparenty out of fashion. If younare willing to change rims I think your options increase immensely.
     
  4. Oct 25, 2018
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

    Medford Mass USA
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    I believe the trend toward larger diameter wheels is driven more by brakes than anything else. A larger diameter wheel has room for a larger diameter rotor, which is more effective. The standard for braking has increased a lot since the 50s and 60s. To the OP, what are the specs of your Jeep? You may be happier with both a smaller width and smaller diameter tire, depending on what you're working with.
     
    Jrobz23 likes this.
  5. Oct 25, 2018
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    Dont confuse me with logic...
     
  6. Oct 25, 2018
    Sierra Bum

    Sierra Bum Member

    The High Sierra
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    Oct 23, 2017
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    145
    A few suggestions here....it would be useful to know what the specs are with your rig so folks know what you're working with. First, what are your goals with the Jeep?...having a build plan early saves lots of money later on. These things snowball and choosing tire size is related to many other variables. It's all about a well-balanced set-up.

    The 4 speed: If your first gear is "useless", it is likely a truck four speed with a granny gear. Many folks are after that for the off road "usefulness" of a deep low gear in rough terrain. Drive it like a three speed on the street (start in second). If you have a dana 18 t-case it will accept an overdrive unit, and then you can split every gear.

    Tire size & Suspension: Sounds like someone threw whatever for tires on there, just to get it rolling cheap. 35's will likely require fender trimming to fit, even with a lift. 33's fit with a typical 2.5" suspension.

    Gearing: These old jeeps are often geared low, and Jeep folks who like to go off road want that. What engine do you have, and do you know your ring and pinon (axle) gears? Your final drive coming out of the t-case will be 1:1 (without an auxiliary overdrive).
    For example, I drive a 68' CJ5; it has a V6, an SM420 truck 4 speed, 4.88's in the axles, 33" tires and a Warn overdrive. Its a well-balanced, classic-build trail CJ and I'm fine going only 55-60 mph...the thing is 50 years old.

    Lastly: There's lots of ways to skin this cat, and there's several proven formulas for success depending on your goals with the Jeep: Resto-mod? Off-roader? Mall Crawler? Keep all original?
     
    colojeepguy, Tom_Hartz and Hellion like this.
  7. Oct 25, 2018
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
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    Yes - more info about drivetrain specifics might help with some of the gearing and speed question.
    With regard to tire size - Most 35s are 12.5" wide except for some limited options from Interco/Superswamper that do have 34x9.5 and 35x10.5 optioins. That is a lot of tire for most ecj5s without some additional work and care for other components. For a more moderate tall skinny look, 33x10.5r15 seem to work well with a 2.5" lift (and possibly a little extra in shackle). 235/85r16 is just about at 32x9.5 and a 255/85r16 will also get you above 33inches and only 10inches wide.
     
  8. Oct 25, 2018
    rejeep

    rejeep Active Member Sponsor 2019 Sponsor

    Rochester, NY
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    rock some OG 7.50x16 and be that much cooler
     
    PeteL and Hellion like this.
  9. Oct 26, 2018
    Rick Whitson

    Rick Whitson Detroit Area Sponsor 2019 Sponsor

    I live South of...
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    Welcome from Michigan. Depending on what axels you have, 55mph is about top speed for a 134 F motor, with the 5:38 gears. I like factory size tires on mine, the 5:38 axels need tall tires to get to 55mph. Good luck
     
  10. Oct 27, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
    Joined:
    Jul 25, 2018
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    Tim,

    I get the brake issue, the brakes on this rig suck. Yes I know going to larger tires will compound that issue.

    The woman who gave me this Jeep did the tire mix just to keep it rolling. The spare is the 35” Mickey Thompson the others are a mish mash of tires.

    This was her husbands hunting rig. It is really well built and in fantastic shape. Outside of new springs and tires it is darn neer perfect. It does have a v-6 and an arb air locker in the rear.

    A tall 33 may be a good choice over a 35. I’ll start looking into those...

    Thanks everyone for your input. Keep it coming!
     
  11. Oct 27, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
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    Jul 25, 2018
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    Once I decode that I’ll have to look into them...
     
  12. Oct 27, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
    Joined:
    Jul 25, 2018
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    James,

    I need to do a lot of work to figure out what I have here. It is new to me and I am still in the honeymoon phase with it.
     
  13. Oct 27, 2018
    Sierra Bum

    Sierra Bum Member

    The High Sierra
    Joined:
    Oct 23, 2017
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    145
    Wait, this was free? ARB in the rear, V6, and in great shape? Score! sounds like a 70' or 71' to me, because its gotta have a 30 spline, flanged rear-end with that air locker.

    If you indeed have a truck 4 speed, its probably either a T18 or an SM420.

    33x10.50's on these short nosed jeeps is a nicely balanced size with around 3-3.5" of lift.

    I have non-power discs in the front (dana 30) and it stops quite nicely. Makes a big difference.

    Now we need to see pics of your new, old jeep!....
     
    Jrobz23 likes this.
  14. Oct 27, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
    Joined:
    Jul 25, 2018
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    34
    I posted a few before but you can never get enough. Not free but a deal I couldn’t pass on...

    [​IMG]
    [​IMG]
    [​IMG]
     
    txtoller likes this.
  15. Oct 27, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
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    FWIW, the title is ‘65 but I know from viewer here that it is a mix of years...
     
  16. Oct 28, 2018
    Sierra Bum

    Sierra Bum Member

    The High Sierra
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    I know this was originally a tire question, but i get i little carried away with a great potential old jeep. I checked out your introductory thread...

    That thing has some really desirable upgrades, as you're probably learning. The even fire V6, swing pedals, a truck 4 speed?....

    Its probably a twin stick dana 18, so it will take an Overdrive. I'd think with that, and skinny 33's you'll be doing 60 on the highway...and in relative comfort with some suspension work.

    ...And it has a 30 spline full floater rear axle. With so many upgraded parts from so many places, the r&p gearing could be several different possibilities. 5.38, 4.88, 4.27......You'd have to open it up to know for sure.
     
  17. Oct 28, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
    Joined:
    Jul 25, 2018
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    Thanks for that. The first thing on my current list of things to do is drain and fill the tranny. It’s quite noisy. Yes it is very past due for springs as well. The more I think about it 33’s make good sense to me. This will be used for hunting and that’s about it. No need for monster meats....
     
  18. Jun 4, 2019
    Alan28

    Alan28 Well-Known Member Sponsor 2019 Sponsor

    Châtillon en...
    Joined:
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    I have some difficulties to understand how to get the good tyres for my CJ5.
    Today I have 4 old Michelin 6.50 x 16.
    Old because I know they are cracking, very hard, and one of them cracked.
    But I cannot find them in the shop. No more production.
    I can get tyre for agriculture, but spee limit is legally 50 Km/h maxi so I cannot use them.
    I can find some "new old military" tyres but I wanted an other look.
    Do you have an idea of existing tyres available for my rims ?
    I see very expensive typres for Jeep, but for wide big rims.
    I also find some tyres size 6.00 x 16, what is the difference with 6.50 x 16 ?
    20190103-snow.jpg
     
  19. Jun 5, 2019
    fhoehle

    fhoehle Sponsor Sponsor

    Harford Township, PA
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    Apr 11, 2012
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    803
    If you drive the road a lot, I'd suggest looking at radial tires in the 215 size or the 235/85R16 size. Depending on what you want for height. There are tons of options. If you want to look for bias ply tires, look at Coker tire or Miller tire, they are online and have antique style tires in many different tread patterns.
     
  20. Jun 5, 2019
    fhoehle

    fhoehle Sponsor Sponsor

    Harford Township, PA
    Joined:
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    For the OP, BFG, General and Interco make tires in the 33/10.50/15 size. Stay with 15 inch trims for the largest sidewall section and offroadability.
     

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