Nitto NT555R 305's

Discussion in 'Dodge Challenger SRT Hellcat' started by James White, Dec 26, 2014.

  1. James White

    James White SRT Hellcat Supporter Gold Supporting Member

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    Has anybody actually got a set of these on yet? The factory tires are fun for burnouts but just hold the cat back in friendly contest of speed ;)
     
  2. hellcat1

    hellcat1 Gold Member

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    I believe someone has them.....Just not sure where I seen it
     
  3. Hattrick

    Hattrick Silver Member

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    You will need at least a 11" wide rim to fit those puppies on the Hellcat. Standards are only 9.5" wide. 285s are about widest you should go.
     
  4. hellcat1

    hellcat1 Gold Member

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    Im not sure, The other forum has a guy running 315 35 20,, on stock wheels
     
  5. RadCat

    RadCat Left Shark

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    Actually it requires a 10-12" wheel, which is the recommendation of both Nitto and MT.
     
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  6. Hattrick

    Hattrick Silver Member

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    Tirerack also has good fitment charts also ( for tire and rim sizes). I don't think the sell Nitto. So 11" would be middle ground and would not look too pouched out or tucked in, if you know what i mean. But fender clearance may be a problem. Don't you think Dodge would have put larger tires/wheels on the back if they could have fitted them, ala Z/28? There is a company that makes widebody kits for the Challengers already. Front/rear. So you can go wide as you want. BMC Extreme Customs.
     
  7. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    I ran 275s on 10" wide Viper rims and had plenty of rim width to go up to 305s.... Of course the 30mm difference might be an issue with the wheel well lip if the offset isn't just right.
    Running 305s on 9.5" rims does two things -
    1) makes you tire tech work his @$$ off to get the tires mounted, and
    2) causes inordinate wear in the center of the tire tread (the narrower wheel causes the tread to bulge slightly at recommended pressures).
    A 10" or 11" wide wheel is a much better choice - BUT I suggest you put the rim on the studs BEFORE having tires mounted on them. Better to know the offset is good before mounting and balancing rubber and be disappointed (and out some coin).
     
  8. tsc

    tsc SRT Hellcat Enthusiast

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    Nitto tires run narrow compared to other manufacturers, so their 315 is like a 305 or maybe even 295 from some manufacturers (like Michelin). CT has someone running 315/35/20 Nitto DRs on stock wheels with just a hair of 'meat' hanging off the side. Totally fine on the street and remove tire pressure at the track.

    For non-Nitto tires, the widest you should probably go is 285, maybe 295 on the stock wheel.
     
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  9. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    For "Stock" classes, we've always reduced rear tire pressure on the Goodyear F1s to 23 lbs. Yes, it sets off the TPMS alarm on the dash, but that's expected.
     
  10. James White

    James White SRT Hellcat Supporter Gold Supporting Member

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    Okay, after researching the net for DOT radial street/strip "slicks" I'm leaning toward the Mickey Thompson ET Street Radial II P305/35R20. I think I'll just put them on the stock wheels and let her rip.
     
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  11. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    They were my top choice as well, but I didn't know they came in 20" diameter..... Thanks for the heads-up. I need to search a bit more now. :D
     
  12. KAR Farm

    KAR Farm Hellcat Member

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    I have these (Mickey Thompson ET Street Radial II P305/35R20) on my 905 horsepower 2012 ZL1 Camaro and they are great tires..I plan on putting them on my Hellcat when mine comes in.
     
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  13. James White

    James White SRT Hellcat Supporter Gold Supporting Member

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    More info: Best I can tell the Mickey's recommend a rim width of 10 to 12 inches whereas the stock wheel is 9.5. Close enough I figure and somewhere in the memory banks I'm remembering a rule of thumb tread width plus an inch. The Mickey's are 10.4 wide at tread (compared to stock 9 inches) so our 9.5 stock wheels should be okay. The stock diameter is 28.8 inches vs the Mickeys at 28.9. Section width for the Mickeys on an 11 inch wide wheel is 12.5 vs stock 11.2. That could be the rub. I've crawled around underneath while the car is bearing its weight and there is not a lot of room; some but not a lot.

    So far looking for new wheels is driving me crazy. Offsets, backspacing .... too many variables for me to figure out. I'm betting the Mickeys will work just fine. Anybody else got an opinion?
     
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  14. James White

    James White SRT Hellcat Supporter Gold Supporting Member

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    Hey ChallengerDad, be sure to look for the ET II. Go to their main web site, pull down strip window, then pull down DOT window, then click on ET Street Radial II


    Here's the marketing spiel from their site:

    ET Street Radial
    Optimized For Modern Sports Cars & Sport Compacts
    The ET Street Radial line is specifically designed for modern performance cars including sport compacts, Mustangs, Corvettes, Vipers and others that require bigger wheel diameters for brake clearance.
    • Soft Compound For Superior Traction On The Drag Strip
    • Radial Construction for Excellent Ride Control on the Street
    • Polyester Ply, Steel Belted for Strength and Durability
    • D.O.T. Approved
    • 90000000957 3727R P305/35R20 29X12.50R20 36 R2 10.0-12.0 11 12.5 10.4 28.9 89
     
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  15. James White

    James White SRT Hellcat Supporter Gold Supporting Member

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    Excellent! I'll tell my wife she got me another Christmas present!
     

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