Enter your username:
Do you want to login or register?
  • Forgot your password?

    Login / Register



    Results 1 to 12 of 12
    1. #1
      Join Date
      Oct 2015
      Posts
      48
      Country Flag: United States

      wheel measuring help

      I'm looking for tips on how to measure for the correct backspace for my Chevelle. The car is mini-tubbed using the abc performance kit and the rear is narrowed 5 inches. I'm currently running a 313/35/20 on a 20x10 with a 5.5 inch backspace with a 2 inch adapter. If I'm figuring this right this means on a 20x10 wheel I'd need a 3.5 backspace to mount the wheel without adapters. I have the wheels mounted as close to the fender as possible. So if I'm planning on running a 20x12 wheel does 5.5 inches of backspacing sound right? I ordered a wheel fit tool but ordered the wrong one for my bolt pattern so I'm debating on measuring for wheels a different way. Here is a pic of the car.

      Name:  20210303_153735.jpg
Views: 154
Size:  641.1 KB



    2. #2
      Join Date
      Mar 2020
      Posts
      108
      In theory... yes. If both the tire & wheel are 2" wider, adding 2" backspace will keep the outside of the tire where it is currently.
      Are you certain there is 2" clearance everywhere at the inside?

      Also, I'm not sure if you are using the same wheel brand/style, but will the wheel clear the caliper without the spacer?
      You can try using your present wheel/tire combo without the spacer to verify inside fitment.

    3. #3
      Join Date
      Oct 2015
      Posts
      48
      Country Flag: United States
      Current wheel doesn't clear the calipers without a spacer, I'm going to order the wheel fit tool to make sure I get ot right. I'm thinking about going with forgeline wheels.

    4. #4
      Join Date
      Aug 2010
      Location
      Seattle area
      Posts
      354
      Try a local tire shop especially ones that sell performance tires .They have tools to measure wheel offset.

    5. #5
      Join Date
      Oct 2015
      Posts
      48
      Country Flag: United States
      I got the wheel fit tool in the other day. Had to mount it backwards to figure out the backspacing. The instructions for it aren't very clear. Looks like a 4.75 backspace on a 12 inch wheel with 335 30 20 with an inch clearance all around. Name:  20210407_204552.jpg
Views: 99
Size:  312.8 KBName:  20210407_204827.jpg
Views: 99
Size:  242.3 KB

    6. #6
      Join Date
      Feb 2018
      Location
      London, Ontario Canada
      Posts
      36
      Country Flag: Canada
      Very nice set up. How many inches do you have from the inside lip of your fender to the mini tub?

    7. #7
      Join Date
      Dec 2010
      Location
      Fredericksburg, VA.
      Posts
      3,125
      Country Flag: United States
      When you order wheels sounds llike you need to specify a tall center pad in order for the caliper to clear the back side of the wheel.
      Steve Hayes
      "Dust Off"
      68 Camaro

      Speed has never killed anyone. Suddenly becoming stationary, that's what gets you!
      "Jeremy Clarkson"

    8. #8
      Join Date
      Oct 2015
      Posts
      48
      Country Flag: United States
      Quote Originally Posted by Canadianwraith View Post
      Very nice set up. How many inches do you have from the inside lip of your fender to the mini tub?
      15 3/4 inches

    9. #9
      Join Date
      Oct 2015
      Posts
      48
      Country Flag: United States
      Quote Originally Posted by TheJDMan View Post
      When you order wheels sounds llike you need to specify a tall center pad in order for the caliper to clear the back side of the wheel.
      Yeah I ended up going with forgelines so I had to measure the caliper height, width and thickness. Placed the order Monday, I ended up going with the ZX3P wheels, can't wait to get them.

    10. #10
      Join Date
      Sep 2010
      Location
      Orange County, CA
      Posts
      578
      Quote Originally Posted by lawrenq View Post
      Yeah I ended up going with forgelines so I had to measure the caliper height, width and thickness. Placed the order Monday, I ended up going with the ZX3P wheels, can't wait to get them.
      Nice choice! What finish did you go with?

    11. #11
      Join Date
      Oct 2015
      Posts
      48
      Country Flag: United States
      Quote Originally Posted by 65 drop top View Post
      Nice choice! What finish did you go with?
      Polished lips with satin gunmetal centers.

    12. #12
      Join Date
      Sep 2010
      Location
      Orange County, CA
      Posts
      578
      Quote Originally Posted by lawrenq View Post
      Polished lips with satin gunmetal centers.
      Thatís gonna be sweet!