Larger rear tires?

Discussion in 'Challenger Wheels, Tires and Brakes Forum' started by Hopslayer, Oct 24, 2018.

  1. Hopslayer

    Hopslayer Full Access Member

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    Saw a guy on Youtube made a video about what his top 5 mods for the Challenger would be. He said he didn't like the gap between the fender and the rear tire, so he recommended putting 275's back there and keeping the 245's on the front. Anyone do this? What are the pros and cons? I assume he's just adding the taller tire on the same rims, correct? There is a good gap there, but I'm not sure if I would gain much by doing it. Thanks.

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  2. 70-426_10-SRT

    70-426_10-SRT Full Access Member

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  3. IntimidatorRT

    IntimidatorRT Moderator Staff Member

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    well you could always lower with with some eibach springs and shocks. should do for about 2 in drop
     
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  4. 70-426_10-SRT

    70-426_10-SRT Full Access Member

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    Agree, that would improve the looks and handling
    but then you have the Speed Bump Scrapes, parking curb hits to the spoiler, and steep exits out of some parking lots.
    Did that on my Stealth & Stratus RT :(
     
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  5. Diehard

    Diehard Full Access Member

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    I would strongly suggest that the first thing you do is get familiar with tire size designations and what they do when changed.

    For example, the 275's you mention is the width of the tire, not the diameter or height.

    Typically you want to maintain the same (or close to the same) tire diameter when making tire width or height(diameter) changes.

    If you're wanting to reduce the space to the fender without changing tire diameter very much....
    1. Remember when you change the tire diameter, only half of that change impacts the space, since it's actually the radius that counts. for example...increasing tire diameter by 1" adds 1/2" to top(reducing space to fender) and 1/2" to the bottom(raising the entire car).

    2. By lowering the car with its suspension.

    3. You can increase the tires profile. For example: assuming your tires are 245/45/20 or 275/40/20. Both of which have about a 28.7" diameter. Changing the 275's to say 275/45/20 would make the diameter about 29.7". 1/2" off the gap but 1/2" higher car, slight error on speedometer and a slight reduction in torque due to the larger diameter rear tires.

    In 70-426_10-SRT's case I believe it calculates to about a 1/8"+ increase in profile width. If he wanted to go much more, without changing his tire diameter very much he'd have to go with a smaller wheel diameter.
     
    Last edited: Oct 26, 2018
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  6. Diehard

    Diehard Full Access Member

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    Putting 275's on in place of the 245's would not change your tire to fender space. You would have to change your tire sidewall height which can reduce your tire diameter. However, if you stay reasonably close to your stock diameter, enough so as not to affect speedometer much, it would make very little difference.

    Sounds like you saw the video I just saw about the 5 modes, but the guy I saw did go to 275's in the rear but not to change the space. He said he was going with air cushions, so he could adjust his height.

    Here's the one I saw.

     
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  7. Hopslayer

    Hopslayer Full Access Member

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    What does he mean by 10 inch wheels and 8.5 inch wheels?
     
  8. 70-426_10-SRT

    70-426_10-SRT Full Access Member

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    Width of rim
     

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