68 riv aftermarket backspacing

Discussion in 'The Hides' started by 68riviera430, Feb 22, 2011.

  1. 68riviera430

    68riviera430 BRRRRAAAAP!

    http://www.coyswheel.com/coys-c57.html
    Looking at these, probably 18's. They only come in select backspacing (4.5 5.5 etc.) does anyone know what size would be best for the riv? Especially to clear those huge drums
     
  2. CameoInvicta

    CameoInvicta Well-Known Member

    You might want to consider going with 17's. When I was pricing out new wheels/tires before I picked up my slot mags, 18in rubber was WAY more expensive. Just something to consider.
     
  3. 68riviera430

    68riviera430 BRRRRAAAAP!

    Hmm, good point, still need to know backspacing options though. It'd probably look better with 17's so it doesnt look like a lowrider and looks more pro touring, meatier tires
     
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member


    Why don't you measure the back spacing on your current wheels? The backspacing requirements will be the same no matter what diameter wheels you use. The only thing you need to do, is keep the overall tire/wheel diameter within 1/2" of stock, so that your gear ratio and speedo calibrations are close. If you go to a wider wheel, you will need a bit more back spacing to keep the wheel centered.
     
  5. 68riviera430

    68riviera430 BRRRRAAAAP!

    I would have done that but I'm not at home. I am thinking of possibly going wide but not too crazy
     
  6. Briz

    Briz Founders Club Member

    Mine are 5" BS Tires fit under the wheel wells.
     

    Attached Files:

  7. 68riviera430

    68riviera430 BRRRRAAAAP!

    Original drums? Think 4.5 or 5.5 would have room?
     
  8. Steiner99

    Steiner99 Well-Known Member

    How do you feel about the C-55? If you like it, the MB Wheels Old School at www.discounttiredirect.com is an identical wheel. I really believe it and the C-55 are the same but at a better price and with a better warranty (lifetime). They also come in chrome which is what I have. They've gone up a little in price since I bought mine a year and a half ago. However, mine came mounted and balanced and shipped free for under $1000.....

    2 - 17x8, 4.5" backspace, 235/45ZR17 tires
    2 - 17x9.5, 5.5" backspace, 275/40ZR17 tires

    There's a Discount Tire fifteen minutes from my house but it was actually cheaper to order them online.
     
  9. Briz

    Briz Founders Club Member

    Original drums but I did trim off the fins along the outside edge.
     
  10. 68riviera430

    68riviera430 BRRRRAAAAP!

    I assume that really wouldn't affect heating up or performance?
     
  11. 68riviera430

    68riviera430 BRRRRAAAAP!

    well, seeing as your 5 backspace was a tight fit, I dont think 4.5 would be worth the trouble around the drums.
    Which leaves me with the only option being the 18x9.5's with the 5.5 backspacing, but that leaves me with no options for a smaller tire in the front...unless I go to disk...gah
     
  12. RAMKAT2

    RAMKAT2 Randy

    Briz, are those aluminum slots 15" or 17"? I tried to put 15" aluminum wheels on my 67 years ago, and they would not clear the fins. Grinding off the tops of the fins on the aluminum front drums wasn't too hard, but the cast iron rear drums were another matter entirely. I ended up going back to the stock wheels on mine. Of course, you couldn't buy aftermarket 17" wheels or tires to solve that problem in 1978! Later, Randy
     
  13. Briz

    Briz Founders Club Member


    The slots are 15x10 and 15x8 Rear/Front. It took some time to get the fins off and cleaned up but it was worth it. Theres just enough room to get stick on weights between the drum and rim.
    Once the fins were trimed off I started the car with the rear off the ground and let it idle while in gear then put the grinder to it while it was turning. Cleaned it up pretty nice. I let the grinder spin the fronts to clean and even them up.
     

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