Thread: Tire Advice

  1. #1
    HPD2000's Avatar
    HPD2000 is offline Junior Member
    Join Date
    Aug 2019
    Posts
    2

    Tire Advice

    I am looking to buy a 2006 TJ Rubicon. It currently has 315/75/16 tires and a 4.5" lift. It tachs 2800-2900 rpms at 60 mph with a 4.11 rear differential. What size tire does this Jeep need to bring it into an acceptable rpm range?

  2. #2
    TerryMason's Avatar
    TerryMason is offline Administrator
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    7,886

    Re: Tire Advice

    I'm not up on Rubicons - is 4.11 the factory gearing, or did you regear it?

    Manual or automatic?

    I've got a 2005 TJ - 3.73, automatic, and 33x12.5 tires. It is fine, but I don't think I could go any larger without regearing.
    My 2005 Wrangler Build Thread

    He who is without oil shall throw the first rod. -Compressions 8.7:1

  3. #3
    Jeepergeo's Avatar
    Jeepergeo is offline Senior Member
    Join Date
    Dec 2010
    Location
    California
    Posts
    416

    Re: Tire Advice

    Back into your answer from this table or one like it.

    https://images.app.goo.gl/qa9QdGePh8mCvtWWA

    Your gearing and tire size sounds like it is delivering an RPM that sounds about right to me for general around town and off road use, but not for a lot of highway driving.

    Here is a site for converting tire sizes to inches.

    https://www.crawlpedia.com/tire_size_converter.htm
    Last edited by Jeepergeo; 08-18-2019 at 12:32 PM.

  4. #4
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    4,764

    Re: Tire Advice

    Using Jeepergeo links, which are good, you should have favorable low RPM at highway speeds with 35" tires on 4:11 gears. And those numbers seem correct.

    What range rpm are you desiring?

    I'll have to run some basic calculations to verify


    Regards,
    JPNinPA

    Sent using TapTalk
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  5. #5
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    4,764

    Tire Advice

    So if you have an automatic in 3rd at 2850 rpm you would be doing 72mph if I calculated correctly. You might not have a corrected speedo /odometer from factory. So 31" tires will have you at 65mph at 2850rpm in 3rd gear.

    Alternative is regearing to 4:56 or 4:88
    Regards,
    JPNinPA

    Sent using TapTalk
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

Similar Threads

  1. Tire pressure advice
    By Rebel_Frontier in forum CJ YJ TJ and JK
    Replies: 19
    Last Post: 06-06-2013, 08:14 AM
  2. Tire Advice
    By Rebel_Frontier in forum CJ YJ TJ and JK
    Replies: 5
    Last Post: 03-30-2013, 11:26 PM
  3. YJ Body Lift and Tire Advice
    By EricUYJ in forum CJ YJ TJ and JK
    Replies: 6
    Last Post: 08-06-2009, 08:26 AM
  4. tire advice for newbie
    By 30yrheel in forum CJ YJ TJ and JK
    Replies: 5
    Last Post: 08-27-2005, 12:02 PM
  5. need advice on tire selection for my XJ
    By dingus in forum General Chat
    Replies: 4
    Last Post: 07-20-2003, 07:00 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Log in

Log in