No announcement yet.

Wheel backspace

  • Filter
  • Time
  • Show
Clear All
new posts

  • Wheel backspace

    What is the wheel backspace for a 1963 stock Stude drum brake car? thanks jimmijim
    sigpicAnything worth doing deserves your best shot. Do it right the first time. When you're done you will know it. { I'm just the guy who thinks he knows everything, my buddy is the guy who knows everything.} cheers jimmijim*****SDC***** member

  • #2

    Sep 2004
    It turns out there is a wheel wholesaler warehouse here in fargo that
    has some of the ford rims in stock.

    I went over there friday with a tape measure and got some dimensions.
    I also remeasured my stock '53 rims this weekend and also a '63 lark
    stock rim I have around. So here for future reference is what I

    Stock '53 rim:

    Tire bead inside Width: 5"
    Overall outside width: 6-1/8"
    Backspacing: 4-3/8"
    Offset (tire centerline to inside edge): 1-5/16"
    Center hole ID: 2-3/4"

    Stock '63 lark rim:

    Tire bead inside width: 4-1/2"
    Overall outside width: 5-5/8"
    Backspacing: 3-5/8"
    Offset (tire centerline to inside edge): 1-1/16"
    Center hole ID: forgot to measure

    6" Ford rim, NWRA X-40273:

    Tire bead inside width: 6"
    Overall outside width: 7-1/8"
    Backspacing: 4-1/8"
    Offset (tire centerline to inside edge): 9/16"
    Center hole ID: 2-3/4"

    Currently, my '53 has a stock mid 70's Maverick 8" rear end in it.
    With the stock '53 rims, my track width from center to center of the
    rear tires is about 54-1/2" to 54-3/4". I have 205/75R15 tires on it
    and there is about 3" to 3-1/2" clearance from the tire sidewall to
    the fender lip on each side.

    While at the zone meet in WI last month, I took the opportunity to
    check out some other cars. There was a '54 Champion hardtop there
    with stock sized bias tires (6.70-15). I'll assume it had the stock
    wheels since everything else about it was stock.... Track width was
    56-1/4" center to center and about 2 to 2-1/2" clearance from the
    sidewalls to the fender lips. I also checked the rear track on a '58
    packard hawk and it was also 56-1/4".

    Soooo. It would appear that the Maverick rear end is about 1-1/2" to
    1-3/4" inches narrower than the original rear was in my car. Taking
    into account the rim width increase and change in offset, if I put
    these wider rims on the back, I should increase my track width about
    1-1/2" and get back what was lost. The outside of the wheel should
    push out 1-1/4" over what I have now and will make my fender clearance
    essentially the same as the stock setup was like I measured on that

    Jeff Hopman
    '53 Starliner

    '63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires
    '63 Avanti R1, '03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, TKO 5-spd, Ported heads w/SST full flow valves.
    Check out my disc brake adapters to install 1994-2004 Mustang disc brakes on your Studebaker!!
    I have also written many TECH how to articles, do a search for my Forum name to find them