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Thread: Wheels and tires for a 55 C4 conversion

  1. #1
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    Wheels and tires for a 55 C4 conversion

    I have a 55 2 door HDTP with the Newman Chassis using a 86 C4 suspension. Per CN calculator it looks as if my wheels and tires I'm leaning towards will fit. On the rear Im still undecided if I want 17 or 18 x 10 7" BS with 275 maybe 285 x 40 x 17 or 18. Will I regret going to 18 on the back and 17 on the front? Is a 285 too much for a 55 as it is I will have to remove the lower shock mount to install either way I go. Front is simpler 17 x 8 6" BS 245 45 17.

    Any opinions on the NITTO NT555 G2?

    Thanks
    Mike

  2. #2
    Registered Member chevynut's Avatar
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    If the car is mini-tubbed you could go with a 295 tire max. A 275 should be an easy fit and is as big as you can go in a stock tub. The dogbones are really what limits the inside of the tire, but the tub is just about in the same place so you need some tire clearance. You only need around an inch and a half more.

    The 86 C4 rearend is 62 1/4" wide at the wheel mounting surfaces. A 10" wheel with 7" BS has 1 1/2" positive offset. That makes the tire track 59 1/4" wide.

    The outside of a pair of 275 tires would then be at about 70 1/8". That leaves about 5/8" from the tire to the fenderwell lip depending on the body dimensions and centering.

    A larger diameter wheel will make it easier to remove them from the car. One trick I learned is to rotate the tire UNDER the disc when installing and removing. Also, use a shock that's longer than necessary so it will extend further, if you have the room, which you may not have with a Newman frame. Every little bit helps.

    My Nomad has 18s in the rear with 295s and 17s in the front with 245s. I think they look good. When I get the final custom wheels they will probably all be 18s. I might go 20s just to piss off the old schoolers. LOL

    20120325_0005.JPG
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

  3. #3
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    CN Thanks for the response. The car is not mini tubed. Is 5/8 from tire to fender acceptable?

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    Registered Member Custer55's Avatar
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    I have 90 Vette suspension on my 55 using 90 Vette wheels, 285/40/17 on the rear, 255/40/17 on the front. no issues with rubbing at all. I do have a 3/16 spacer on the rear to gain a bit of clearance on the inside, no spacer on the front. I wouldn't go any bigger than the 285 in the rear. In the front I had the stock size Vette tires, 275/40/17 and did not have any rubbing issues so you should be fine with 245's as long as the backspace is right. Not sure if 6" would be enough on an 8" wheel. Stock wheel is 9.5" with 7 7/16" backspace so the outside of the tire will be about the same place but the tire center line would be closer to the fender. I would go with more backspace if it were me. You can always move the wheel out with a spacer and longer wheel studs until you find the sweet spot that puts the wheel farther out without any rubbing.
    I have Nitto NT 555 tires on mine (older version on the G2) I like mine. I think you will be happy with them.
    Brian

  5. #5
    Registered Member chevynut's Avatar
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    Custer, the 86 C4 front and rear are 1" narrower than the 88-96 suspensions you have. That will affect the backspacing needed.

    I typically like the tire outside width to be 67 3/4" or less if the car sits low in front. I'm not sure how Newman sets his ride height. With the 61" front end width of the early C4 and a 245 tire you need a wheel offset of 1 7/16" or more to keep the tire width at that limit. On an 8" wheel that's just under 6" backspacing. So 6" should work fine.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

  6. #6
    Registered Member 55 Rescue Dog's Avatar
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    Depending on your goal, I think a 245/45-17 is a little undersized, since the stock tires in a lighter/smaller C4 is either a 255/45-17, or 275/40-17 both of which have a load index of 98. The 245 is 95 load index. I don't think is quite possible to make the front of a 55 lighter than a C4. For me, I want maximum cornering traction on the front so I will go as big as possible on the front, which will determine what I go to on the rear. I might go with a square setup instead of staggered too. The biggest issue for me depending on wheel/tire combinations is how many tire choices are out there. On staggered setups with matching tires you are lucky to find one or two, if any. With something like a 255/45-18 there are like 48 different brands/models to pick from. Little front tires and big rears are a recipe for an understeering car plowing through the turns, which is safer, but not as fast/fun as a balanced car.

  7. #7
    Registered Member chevynut's Avatar
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    Quote Originally Posted by 55 Rescue Dog View Post
    Depending on your goal, I think a 245/45-17 is a little undersized, since the stock tires in a lighter/smaller C4 is either a 255/45-17, or 275/40-17 both of which have a load index of 98. The 245 is 95 load index. .
    A 95 load index tire can carry 1521 pounds. I don't think the front end of a tri5 is anywhere near 3042 pounds, even with passengers, so there goes your theory....again.

    https://www.tirerack.com/tires/tiret....jsp?techid=35


    The BFG G-Force Comp-2 A/S tire in a 245/45-17 size is rated at 99 and can carry 1709 pounds EACH.

    https://www.tirerack.com/tires/TireS...earDiameter=17

    And we all know that load ratings, like most everything, are conservative.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

  8. #8
    Moderator NickP's Avatar
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    5/8 is tight. Easiest thing to do, manually run the suspension through its articulations.

  9. #9
    Registered Member chevynut's Avatar
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    I don't know Nick....I think 5/8 is plenty if the body is centered and you have that on both sides. My calculations actually showed 11/16 but that's splitting hairs . And he may be able to get more depending on the actual tire size, body width, etc. Also keep in mind that camber increases as the suspension compresses, so the top of the tire tilts inboard.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

  10. #10
    Registered Member chevynut's Avatar
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    I forgot to mention that with the above measurements, the INSIDE of the rear tires would be about 48 7/16 wide using a nominal 275 tire. The stock wheel tubs are 46 1/2" wide inside. The dogbones are about 45 1/4" wide outside to outside in the CENTER of the dogbone between the bushing ends. That's 1" clearance from the 275 tire to the inside of the stock tubs which is about perfect since the tire leans inward at top.

    My Nomad can handle a larger tire in front but only on the inboard side as the outside width is already at about the limit at 67 3/4". I think I have about 3/4" clearance from the tire to the frame there at full lock which should just barely fit a 275 tire. The narrowed rearend will handle a 345 tire but I'll likely never go that large. Now, wait for it, here comes RD's BS about how narrowing the rearend screws up the geometry, even though he doesn't know how. We've been through all of this nonsense before....more than once.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

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