N90 Z28 wheels VS Monte Carlo SS wheels? Same?

Discussion in 'Suspension, Steering, Brake & Wheel Topics' started by DGulliver, Jun 12, 2010.

  1. DGulliver

    DGulliver Member

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    I was looking at some 15" N90's for my '78 4-speed car to use for road trips. It came with the 14" Rally's, which I would keep for shows, and for originality's sake. It's just a little too wound up on the highway with the 14's, and I felt like the 15's would help with that..

    A local guy has four Monte Carlo SS wheels that he says are 15". Is there a difference in offset, or other differences I should be aware of? I don't really care if the casting numbers are different, these wouldn't be original to my car anyways.. Any thoughts?


    thanks, guys!
     
  2. GoldenOne7710

    GoldenOne7710 Equal Opportunity Offender Lifetime Gold Member

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    I'm pretty certain the lug holes are different. The Camaro wheel takes a lug nut with a short shank on it like this [​IMG]

    The Monte Carlo wheels take a tapered style lug nut like this.....
    [​IMG]

    As far as the backspacing.....the N90 for a Camaro has a 4.25" backspacing. I'm not sure what the backspacing is for the Monte Carlo aluminum wheel.....it COULD be the same.
     
    Last edited: Jun 12, 2010
  3. AKohler883

    AKohler883 Veteran Member

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    Backspacing is slightly different, and yes lugs are different, but if you don't care about that, go for it, they will fit. I have a set of Monte SS wheels that I have not tried out yet because they need some work to look decent.
     
  4. quadriderkyle

    quadriderkyle Member

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    unless you are going to put taller tires on the 15" rims, the rpm's on the highway aren't going to change based on the rim size.
     
  5. GoldenOne7710

    GoldenOne7710 Equal Opportunity Offender Lifetime Gold Member

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    Not understanding your comment....

    If he's currently running a (example) 235/60R14.......and on the 15" rim decides to run a 235/60R15.....the overall tire height has increased by 1 inch. It will certainly change the RPM's at a given MPH.
     
  6. woody80z28

    woody80z28 Veteran Member Lifetime Gold Member

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    And he is saying if he changed tire sizes on his 14s it would change his RPM with the same wheels.

    When most people go with bigger wheels they keep the tire height the same with a shorter sidewall. I went from a 205/60/15 to a 225/45/17 on my Beretta so the height and speedo would be the same. The shorter sidewall with the larger wheel is what helps cornering.
     
  7. DGulliver

    DGulliver Member

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    thanks for the input guys...

    I just like the look of the N90, it's still a factory wheel, and yes- I want to reduce rpm's on the highway. I'm funning F70-14's now, a 15"er would definitely reduce rpm's.

    I don't care about the lug nuts being different, if there's not an offset issue..
     
  8. 81BirdMan

    81BirdMan Veteran Member

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    http://www.montecarloss.com/SS_FAQ_7.html

    80-81 Z/28 wheel (N90 option)
    -15x7 w/ 5x4.75" bolt circle
    -Take a shanked nut/washers (or "shoulder" style shanked nut)
    -Have 4.25" BS (therefore less of a "dish" compared to SS wheels)
    -slightly different (flatter & wider) outer wheel lip than SS wheels
    -"Z28" centercaps

    86-88 SS wheel
    -15x7 w/ 5x4.75" bolt circle
    -Take regular acorn nut
    -Have 3.75" BS
    -slightly different (taller and narrower) outer wheel lip than Z/28 wheel
    -"Chevrolet" centercaps
     
  9. Brown`77Z28

    Brown`77Z28 Veteran Member Lifetime Gold Member

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    I bought a set of Monte Carlo wheels awhile ago on Ebay and I love them.
    They have different lug nuts (as stated above) and different Backspacing (stated above too)

    [​IMG]
     
  10. THOMAS81Z

    THOMAS81Z Veteran Member

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    nice stance!!!!
     

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