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308 bolt pattern Question

Discussion in 'Technical Q&A' started by Sean F., Oct 13, 2004.

  1. Sean F.

    Sean F. F1 Rookie

    Feb 4, 2003
    3,003
    Kansas
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    Sean F
    Isn't the 308 Bolt Pattern the same as a 90's mustang or t-bird?

    5x108 or something like that. The offsets are different I know.

    Thanks

    PS for you search nazi's, I checked and didn't find what I was looking for! ;)
     
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  3. don_xvi

    don_xvi F1 Rookie

    Nov 1, 2003
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    Don the 16th
    I think Fords are 5x112.?.

    Regards,
    ASN Don
     
  4. Mike C

    Mike C F1 Veteran
    Lifetime Rossa Owner

    Aug 3, 2002
    6,075
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    Mike Charness
    same as Volvo through 1989 and Ford Thunderbird through 1989
    5 x 108mm = 5 x 4.25"
     
  5. don_xvi

    don_xvi F1 Rookie

    Nov 1, 2003
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    Not that THOSE are gonna yield a lot of aftermarket or alternate fitments! LOL
     
  6. Sean F.

    Sean F. F1 Rookie

    Feb 4, 2003
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    Sean F
    And the offset is what again? +9mm??
     
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  8. Mike C

    Mike C F1 Veteran
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    Aug 3, 2002
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    No, it's +11 (actually something like +11.2 and +11.45, slightly different front and rear, but I doubt a portion of a mm will make a noticeable difference!)
     
  9. atlantaman

    atlantaman Formula 3

    Mar 31, 2002
    1,726
    Roswell, Georgia
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    Charles
    A weird fact here--

    I did a CAD drawing of my hub when I made my brake rotors and the bolt hole diameter is dead on 4.25"

    however---if you measure how you are told in drawings 9 from tirerack and others) --from center of 1 hole to outside edge of 2nd bolt over you will get something closer to 4.33 inches.

    What to use? dont know... I am thinking about getting sometrack wheels for my car and I think I will just give them my CAD drawings and tell them to " match this".
     
  10. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    20,141
    Texas
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    Any measurement method involving the OD of the lug bolt/stud is just an approximation.

    For a 108mm bolt circle and a 14mm lugbolt, the method you describe (measuring in a straight-line from center of one to outside edge of 2nd over) will overestimate the 108 mm BC as 109.7mm

    The other method shown on the tirerack site (shown below) will underestimate a 108mm bolt circle using 14mm lugbolts as 104.7 mm

    For a better result on the 5-lug pattern, measure from the center of one bolt to the center of the 2nd bolt over and then multiply by 1.0515 to get the true BC.
     

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