Results 1 to 7 of 7

Thread: +10 or -18 Backspacing? Need help picking the right wheels.

  1. #1
    Fresh Catch texasbryan's Avatar
    Join Date
    Feb 2018
    Location
    Texas
    Posts
    34

    +10 or -18 Offset? Need help picking the right wheels.

    I am considering the Black Rhino Chase wheels for my JLUR with a 2.5 in lift. My choices are:

    17x8 with +10 Offset or 17x9.5 with -18 Offset

    I want to run 37x12.5R17 tires (Nitto Ridge Grappler).

    Will both wheels fit fine with zero rubbing? I assume the +10 will stay under the wheel wells better?

    Is an 8 inch rim a little too narrow for a 12.5 in tire? Will the tire balloon out too much?

    I appreciate any advice.

    Thanks!
    Last edited by texasbryan; 03-15-2020 at 08:55 AM.

  2. #2
    Administrator wayoflife's Avatar
    Join Date
    Mar 2017
    Location
    Carson City, NV
    Posts
    7,563
    I assume you're asking about offset? Because, back spacing is typically measured in inches. With a 12.50" wide tire, you really want to run wheels with about 5" of back spacing or less. The less you have, the more your tires will stick out. It should be noted that most aftermarket wheels will come with 3.5" of back spacing.

  3. #3
    Fresh Catch texasbryan's Avatar
    Join Date
    Feb 2018
    Location
    Texas
    Posts
    34
    Quote Originally Posted by wayoflife View Post
    I assume you're asking about offset? Because, back spacing is typically measured in inches. With a 12.50" wide tire, you really want to run wheels with about 5" of back spacing or less. The less you have, the more your tires will stick out. It should be noted that most aftermarket wheels will come with 3.5" of back spacing.
    Doh! Yes, that is the offset. Iíll correct my post. Black rhino doesnít list the backspace but it looks like the 8 inch wheel might be 4.89 inches of BS and the 9.5 inch wheel is 4.54 inches of BS.

    Does that mean the 9.5 in wheels will only stick about .35 inches more than 8 in wheels?

  4. #4
    Administrator wayoflife's Avatar
    Join Date
    Mar 2017
    Location
    Carson City, NV
    Posts
    7,563
    Quote Originally Posted by texasbryan View Post
    Doh! Yes, that is the offset. Iíll correct my post. Black rhino doesnít list the backspace but it looks like the 8 inch wheel might be 4.89 inches of BS and the 9.5 inch wheel is 4.54 inches of BS.

    Does that mean the 9.5 in wheels will only stick about .35 inches more than 8 in wheels?
    What it means is that it isn't enough to really matter. You probably won't even be able to see the difference.

  5. #5
    Fresh Catch texasbryan's Avatar
    Join Date
    Feb 2018
    Location
    Texas
    Posts
    34
    Quote Originally Posted by wayoflife View Post
    What it means is that it isn't enough to really matter. You probably won't even be able to see the difference.
    Agreed! Thanks for your input!

  6. #6
    Knows a Thing or Two WiscoHR's Avatar
    Join Date
    Nov 2017
    Location
    Wisconsin
    Posts
    769
    Quote Originally Posted by texasbryan View Post
    Doh! Yes, that is the offset. Iíll correct my post. Black rhino doesnít list the backspace but it looks like the 8 inch wheel might be 4.89 inches of BS and the 9.5 inch wheel is 4.54 inches of BS.

    Does that mean the 9.5 in wheels will only stick about .35 inches more than 8 in wheels?
    The 9.5 inch wheels will stick out 1.85 inches farther then the 8. They have 1.5 inches more rim on the outside and .35 less on the inside but in all reality thatís really not that much.


    Sent from my iPhone using JL Wrangler Jeep Forum mobile app

  7. #7
    Fresh Catch texasbryan's Avatar
    Join Date
    Feb 2018
    Location
    Texas
    Posts
    34
    Quote Originally Posted by WiscoHR View Post
    The 9.5 inch wheels will stick out 1.85 inches farther then the 8. They have 1.5 inches more rim on the outside and .35 less on the inside but in all reality thatís really not that much.


    Sent from my iPhone using JL Wrangler Jeep Forum mobile app
    Thatís a good point. Looks like the Nittos recommend at least 8.5 inches for the wheel so that alone may make the decision.

Posting Permissions

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