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How to Calculate Offset after Lip and/or Barrel Change

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  • #16
    I have work vs-xx's that are 18x8 et34 with 1.5" lips and im putting on 2.5" lips. So will they be 18x9 et9 or et21? i keep being told different from multiple people.
    Thanks

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    • #17
      there are wheels that the face can be reverse or sandwich mounted, then we can have two wheels with same lip and barrel sizes but different offset...

      i think Capt. Obvious's way of measuring is the best in this case...

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      • #18
        I think the problem with his method is he is measuring the outer width of the barrel not bead to bead. wheels to my understanding are measured bead to bead and the offset is determined by that so If you measure from the outer rim as he has shown your adding another inch in most cases to actuall measure size of the wheel... great thread.....
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        • #19
          I thought wheel width was bead to bead and offset was outer to outer?
          I haz 4 wimz. need 4 more.

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          • #20
            Great info! I wonder if this is the same for all wheels, or just BBS? It would make sense to have an understood way of measuring, but you never know.
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            • #21

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              • #22
                wow... this is good thread. just anyone know about Honda CB4 spect1 model. i just want to know what it's having common errors.
                codesys

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                • #23
                  Hi guys,

                  I have a little dilemma and I hope some of you ran into this so you can give me some piece of advice. I read the whole thread but I'm still confused.

                  I have a set of OZ Futura 18x8J, ET 35, 1.5'' lip that I run with 24mm adapters and 205/40/18 tires.



                  I now want to change the lips with new ones measuring 2.75'' to make the wheels 9.25'' wide and put 215/40/18 tires on them. Will that change the offset of the rim? Since the width of the rim will increase, I plan to mill down the adapters a few mm to a smaller size until it gets to the fitment I want (probably similar to above). Do you guys think it will work?

                  P.S: I would prefer not to do any fender work. I like them the way they are
                  Last edited by daniel_lucian; 01-23-2014, 04:49 AM.

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                  • #24
                    Originally posted by daniel_lucian View Post
                    Hi guys,

                    I have a little dilemma and I hope some of you ran into this so you can give me some piece of advice. I read the whole thread but I'm still confused.

                    I have a set of OZ Futura 18x8J, ET 35, 1.5'' lip that I run with 24mm adapters and 205/40/18 tires.



                    I now want to change the lips with new ones measuring 2.75'' to make the wheels 9.25'' wide and put 215/40/18 tires on them. Will that change the offset of the rim? Since the width of the rim will increase, I plan to mill down the adapters a few mm to a smaller size until it gets to the fitment I want (probably similar to above). Do you guys think it will work?

                    P.S: I would prefer not to do any fender work. I like them the way they are
                    Based to what I understand, your offset will be lower (something around et8 ) therefore you will be poking. The only way you can get it done and be able to run it in your car is redrilling your wheels and ditch the adapters. (someone correct me if im wrong).

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                    • #25
                      help

                      Reading this made me more confused. I have a set of BBS RS. 17x8 +19 and 17x9 +0. What size lips would I need to make it 17x9.5 all around?

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                      • #26
                        Saved for later!

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                        • #27
                          oh my god, there is a chart! SAVED

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                          • #28
                            Use this calculator http://www.tire-size-calculator.info/
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                            • #29
                              Confirmation

                              So I purchased BBS Rs faces (329) which are 17x8 et0.
                              According to previous owner they came with 1.5 lip and 6" barrel. I would like to put 5" lips on the rear which according to that chart puts me at 17x11.5 et - 44.

                              Can anyone confirm that?

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                              • #30
                                Originally posted by Ls1s13 View Post
                                So I purchased BBS Rs faces (329) which are 17x8 et0.
                                According to previous owner they came with 1.5 lip and 6" barrel. I would like to put 5" lips on the rear which according to that chart puts me at 17x11.5 et - 44.

                                Can anyone confirm that?
                                Are they sandwich mounted currently, and if so are you going to leave them sandwich mounted?



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