widest tire/rim combo

Discussion in 'Race car chassis tech' started by 87GN@Tahoe, Aug 10, 2006.

  1. 87GN@Tahoe

    87GN@Tahoe Well-Known Member

    what is the widest tire/rim combo that anyone has been able to fit into the rear wheelwell of a '69-69 skylark... what backspacing was used? what modifications were made (frame notch, rolled fender lips?)


    wes :3gears:
  2. Dubuick

    Dubuick CMDR Racer

    Well right know I have a 30x9 hoosier on a 15x8 which is 12" sectional with 4.5 back spacing tomorrow I'm trying to put on 29.5x 10.5 Mickey Thompson which is 30" tall i'm going to try it on the 8" rim to see how much room is left if any to see I want to get a 10" rim with a 5.5 back spacing going by the chart the sectional of that tire is 13.1 on a 10" rim so i'll give you an update on how I make out and some pictures of how much cutting I'll have to do :Dou:
  3. 87GN@Tahoe

    87GN@Tahoe Well-Known Member

    how much cutting have you done so far?.. and yes, detailed pictures would be MUCH appreciated... you could post them for everyone and/or email me at bilgerat671@gmail.com


  4. mike s

    mike s Well-Known Member

    Had a 12 tire on a 10 centerline in a 68. Had to cut fender lip until it fit. No tubbing or frame notch. The car was also lowerd alot. The car also had a 10 bolt rear so i think that also helped.
  5. 87GN@Tahoe

    87GN@Tahoe Well-Known Member

    you remember what the backspacing was & what the crosssection of the tire was? diameter of the tire.... all the rim specs (dia, width, B/s)? pictures?
    how much narrower is the 10 bolt or how is it different from the 12 bolt for it to "help"?


  6. Todd69GS

    Todd69GS Silver Level contributor

    Wes my brother and I are running a 15X8 with 4.5" BS on his 69. It has a 12 bolt and I would say that a 5" BS would have been ideal for proper clearence. The 4.5" works but it is still tight on the outside.
  7. mike s

    mike s Well-Known Member

    I dont know the what the specs were. It was 10 years or better. The 10 bolt is narrower. Its not that hard to measure your setup. Its a good idea to check your car because its not uncomman for the body to be off center. I have pics but they are not that good.
  8. standup 69

    standup 69 standup69

    I have a 64-67 width housing which is slightly narrower than the 68-72 housing and use a 5.5 inch backspace 10 inch wheel this is about max with a 30x9 slick the goodyears seem to be a little more narrow in their section width than the Hoosier and MT. I now run a 30 x10.5 Hoosier radial but I had to cut and section the frame a half inch to make them clear,I also can now fit a 295/65/15 MT drag radial. Hope that helps good luck. :3gears:
  9. wieland125

    wieland125 wieland125

    Hey Todd, what size slick were you able to fit and did you have to trim anything?
  10. Todd69GS

    Todd69GS Silver Level contributor

    We ran a 30x9 radial slick on that car. I wanna say when we first bought the car it had a 28x10 or maybe even a 28x10.5 (can't remember honestly). It rubbed a lot even w lip trimming. Especially during turns with the spool. That's when we went 30x9.

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