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Folks Of Interest Quick wheel bs question

Discussion in 'The Hokey Ass Message Board' started by StefanS, Jan 4, 2022.

  1. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    Does anybody have the backspacing measurements from a '55 Chevy 15" wheel? Not interested in offset or any of that mess, only backspacing. Thanks
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 50,933

    squirrel
    Member

    no, but I could get one in a few minutes, if you can wait.
     
    VANDENPLAS likes this.
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 50,933

    squirrel
    Member

  4. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,826

    oldiron 440
    Member

    12 minutes, impressive...
     

  5. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    Thanks man I appreciate it. You dont happen to know any 15x5 Chevy steel wheels with 3" of bs do you?
     
  6. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    I sold my Belair and picked up a '49 Ford coupe. I'm putting an s10 axle and t5 in it so I have to be careful of the wheel size
     
  7. twenty8
    Joined: Apr 8, 2021
    Posts: 938

    twenty8
    Member

    SPECIFICATIONS
    SKU OEPR155SG300
    Brand SpecialtyWheel
    Bolt Pattern 5x4.75
    Finish Primed
    Wheel Size 15x5
    Backspacing 3.00
    Vehicle Application OE Style

    From Coker Tire.
     
  8. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    Hell yeah I completely forgot about Coker. Thanks man I appreciate that. Any factory wheels that may be a little less expensive? If there aren't any I'll just go with them
     
  9. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,818

    Johnny Gee
    Member
    from Downey, Ca

    A little late to the came. Pulled "stock" spare that's a 15x5 and it's 3 1/4" exactly at the inside of the rims lip.
     
    Last edited: Jan 4, 2022
  10. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,826

    oldiron 440
    Member

    That's how I have always measured wheels, where the bead contacts the wheel but now some wheel manufacturers measure at the widest part of the rim, the part that the weights went on.
     
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  11. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,306

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    That likely would be the same wheel spec that @squirrel measured and reported. Including the rim lip in the measurement of ‘backspacing’ is standard practice so far as I know. That is because that is the full rim width. Now, rim width, for tire mounting purposes is measured inside the flanges. :confused: :D

    Ray
     
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  12. squirrel
    Joined: Sep 23, 2004
    Posts: 50,933

    squirrel
    Member

    yeah, I measured back spacing, from the wheel mounting surface to the very edge of the wheel.

    I doubt there's a stock wheel with 3" back spacing, but I could be wrong.
     
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  13. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,818

    Johnny Gee
    Member
    from Downey, Ca

    That's what suck's about it. If one is building a tight set up they best be on your toes about what to order.
     
    oldiron 440 likes this.
  14. partsdawg
    Joined: Feb 12, 2006
    Posts: 3,148

    partsdawg
    ALLIANCE MEMBER
    from Minnesota

    What’s Hollander say?
     
  15. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    Yeah I figure it has to include the lip. Summit has a "smoothie" wheel with dual bolt pattern and 3" bs for $75 ea. They'll be behind a set of Foxcraft skirts so even though they don't look so hot they wont be seen anyway. I'm hoping they (whichever company that makes them and provides the specs) measure theirs to the outer edge.
     
  16. twenty8
    Joined: Apr 8, 2021
    Posts: 938

    twenty8
    Member

    The stated wheel width (eg: 15 x 5) is measured from inside the tire bead mounting surfaces. Always has been.
    The total outer width of the rim is nominally 1" wider than the stated size (half an inch per side). A 5" wheel will actually measure up at six inches total overall.
    Backspace is measured from the inner most rim edge to the inside of the wheel mounting surface.
    It can be a bit of a trap if you are unaware.

    Now, who wants to dive down the rabbit hole that is "offset"..............o_O
     
    Last edited: Jan 4, 2022
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  17. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    Not trying to be disagreeable or anything but I just Googled the correct way to measure wheelback spacing and went to images. Literally every single picture had a straight edge across the wheel on the outer edge
     
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  18. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,826

    oldiron 440
    Member

    I agree with what you said but some wheel manufacturers are using the outer most part of the wheel for width and back spacing. And that's a problem when you only have an inch or less on both sides to work with. The last time I switched from Center Lines to Weld Wheels the Center Lines measured as you said and the Weld Wheels were just opposite. The Welds were a half inch farther out. Same size same offset.
     
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  19. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    We'll leave offset to the import crowd
     
  20. twenty8
    Joined: Apr 8, 2021
    Posts: 938

    twenty8
    Member

    Straight edge across the inner-most edge and measure outwards to the wheel mounting surface.

    All the big guys in the business have been using backspace and offset in the US for quite a while. Check out Speedway, Summit Racing, Jegs, and Wheel Vintiques (just to name a few). Offset is simply another way to measure and define backspace.
     
  21. squirrel
    Joined: Sep 23, 2004
    Posts: 50,933

    squirrel
    Member

    it's just that offset makes us have to think too hard...and I never know if positive or negative offset means the wheel sticks out more.

    Backspace is pretty easy to understand.
     
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  22. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    Yeah, I caught the innermost edge thing after I posted mine lol
     
  23. LOWDUG37
    Joined: Jan 31, 2007
    Posts: 971

    LOWDUG37
    Member

  24. junkman8888
    Joined: Jan 28, 2009
    Posts: 813

    junkman8888
    Member

    Gentlemen, I humbly recommend that we all step away from the "circle of confusion" and let this guy solve his own problem. Steel wheels back in the day were riveted together so it is an easy process to drill the rivets out, bolt the wheel on the axle then move the hoop either in or out on the wheel center as needed for clearance (this also lets you know if the hoop is too wide or too narrow). Once the wheel hoop is centered in the opening, the rim and hoop can be tack-welded together, removed from the car and finish welded, job done.
     
  25. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    How do you get the wheel square, How do I change my Ford bolt pattern to a Chevy bolt patternand then does it then need to be balanced before mounting the tire? Or better than all of that, I could buy a Chevy wheel with the backspacing that I need since I need new wheels anyway, hence the reason for this post
     
    Last edited: Jan 6, 2022
  26. twenty8
    Joined: Apr 8, 2021
    Posts: 938

    twenty8
    Member

    What are the regulations relating to wheel spacers in your area. If they are acceptable, it may be the answer.
    https://www.summitracing.com/search...ending&keyword=wheel+spacers&kr=wheel+spacers
     
    Last edited: Jan 9, 2022
  27. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    I initially thought about 1" spacer/adapters with the Ford wheels. The issue with that is I want to run the s10 axle because it's an inch narrower on each side. That'll make it easier to get the wheel on and off. If I space it out with spacers I'll be in the same position I'm in now.
     
  28. twenty8
    Joined: Apr 8, 2021
    Posts: 938

    twenty8
    Member

    The only way the wheel will be easier to remove is if there is more space between the wheel and the skirt, regardless of where the wheel mounting surface is. You still have to be able to clear the wheel studs.........
     
  29. StefanS
    Joined: Oct 7, 2013
    Posts: 1,256

    StefanS
    Member
    from Maryland

    Correct. They'll be in an inch further with the s10 axle compared to the factory axle. That'll give me an inch more clearance which will be more than enough room
     
  30. twenty8
    Joined: Apr 8, 2021
    Posts: 938

    twenty8
    Member

    But if you go from 3.75" backspace to 3" backspace, you move the outside of the wheel/tire out 3/4 of an inch.
    That would mean you have only gained 1/4" more space between tire and skirt........:confused:
    New axle moves it in 1"........... New backspace moves it back out 3/4".
     
    Last edited: Jan 9, 2022

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