Will 3 3/4" BS work on front with 15"x7" wheel and drum brakes

Tires and Wheels (Mopar Hubcaps Too)

  1. 69rrvert

    69rrvert Member

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    Been looking at new wheels for the 69 RR and the ones that I would like to get only come in 3 3/4" back spacing on a 15"x7" for the front. The only other option would be to go with 15"x8" on all corners to get the 4 1/2" bs. The wheels are the Torq-Thrust 605D. Thanks, Steven
     
  2. davek

    davek Well-Known Member

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    3 3/4" back spacing on a 15"x7" for the front,I think you need more BS that might hit the fender wheel opening aka lip. I hope someone with more knowledge will chime in. I have 8 with 4.25 bs on front and 10 with 4.5 bs on back
     
  3. 33 IMP

    33 IMP Well-Known Member

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    I think they will work just fine.
    As you know, wheels are measured from inside bead to bead, and most aluminum wheels have about 1/2 thick beads. So a 15x8 is nine inches outside measurement. The 4 1/2 bs put the mounting flange dead in the middle of the wheel. This seems to be a size that fits almost everything, on the back.
    15x7 with 3 3/4 bs means the wheel is a quarter inch farther toward the fender than dead center (center would be 4"), but still a quarter inch farther from the fender than a 15x8 would be.
    It should fit fine with a normal width tire for the wheel size. I would use a 215 in whatever aspect ratio you want.
     
    • Agree Agree x 1
    • 69rrvert

      69rrvert Member

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      Thanks for the input. I was thinking of 245/60/15 (26.5") up front and 275/60/15 (28.0") on the rear. If I went with a 215 on the front, what size would compliment it on the rear? I would like a little rake but not too much. Currently, it has the factory 14" mag 500 with 195/70's i believe on all corners and it seems to be a little lower in the rear. Thanks, Steven
       
      Last edited: Dec 19, 2020
    • 33 IMP

      33 IMP Well-Known Member

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      I personally like to run a tall tire, to visually fill up the wheelwell. The 215 rec is Very conservative, i have had 225x60s on a six inch rim, and 235x70 on a seven.
      A tall tire wont handle great, but i dont think our cars handle great, no matter what tire, unless lots of work toward that goal has been done.
      With 28 tall on the back, id shoot for 27 tall on the front.
       
    • mopar 3 B

      mopar 3 B Well-Known Member

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      Sorry most feel that their mopars don't handle well. Tires and alignment are key factors. Visuals are not.
       
    • 69rrvert

      69rrvert Member

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      Been looking through the tire threads and it seems people like the 215/70/15 front (26.69") and the 275/60/15 (28.07") rear. I'll keep reading but may look into that combo. Thanks, Steven
       
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