Tire Clearance Concern

Discussion in 'SRT Hellcat General Discussions' started by rollieman, Jun 15, 2016.

  1. rollieman

    rollieman Silver Member

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    Gents I need your expert opinion on this tire/wheel combination for the rear of a 2016 Hellcat Challenger:

    295/40/20 Pirelli mounted on an 11" wheel with a 25+ mm offset.

    According to a tire/wheel/offset program I found on the WEB this combination will cause the tire to stick out on the outer fender side by .10 compared to the original 275/40/20 mounted on the factory 9.5 wheel which is extremely minimal; however, on the inside it will move the side of the tire inboard by .70 which is my concern.

    So the bottom line and my question is do you think this additional .70 inward will hit any of the suspension components or the inner wheel well?

    As a point of reference when I run a 305/35/20 through the same program it has the tire inward by .60 when mounted on either a factory 9.5 wheel or a 10.0 replica. As we know there're a number of our members who run this combination, but also the 295 tire is .90 taller than the 305 tire!

    Note: the 295/40/20 Pirelli has a cross section of 12.0" and is 29.20" tall.

    Thank you very much !!
     
    Last edited: Jun 15, 2016
  2. BIG DAWG

    BIG DAWG Hellcat, 1st Florida Cavalry Hellcat Car Club Gold Supporting Member HCC National Exec. Director HCC Charter Member

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    rollieman...I would PM Tire God, who is on this forum...he knows a ton and has always proven ready to help
     
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  3. Bayou Teche

    Bayou Teche Rookie

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    Hello, Rollie.

    I currently run pirelli 295/40/20 106y at all four corners on stock wheels at all four corners. There are no clearance issues.
     
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  4. Bayou Teche

    Bayou Teche Rookie

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    Note: this is on a non-lowered car.
     
  5. rollieman

    rollieman Silver Member

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    Thank you Bayou Teche,
    That set up will definitely clear because it only moves the side of the tire inboard by .40 from stock, actually even less because the section width spec for that tire is based on a 10.50" rim, so by mounting it on a 9.50 rim it effectively reduces the cross section by .20 per side which means your tire is only inboard by only .20 from stock; however it will stick out by .20 further than stock which isn't bad. So in this case, using a smaller 9.50 rim with a 295/40/20 tire actually reduces the effective cross section by .40 total (.200 per side). Accordingly I'm guessing your 295/40/20 tires are about even with rear fender @ 12:00 when looking directly down?
     
  6. rollieman

    rollieman Silver Member

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    I've come to the conclusion this isn't going to work ---- a 295/40/20 tire with a section width of 12.0" X 29.2" tall mounting on a 11.0 X 25 mm offset wheel will very likely rub on the inner wheel well, not to mention the section width spec. which is based on a 10.50 wheel will expand it by another .10 per side because of the wider rim size, thus the tire will move inboard .80 and outboard .20. I'm better off using the stock 9.50 wheel same as Bayou Teche has done which will have the same outboard and inboard increase of only .20.
     
  7. HellCat_child253

    HellCat_child253 Gold Member

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    Tire God 2.0 Please help our fellow member here your the expert in this my friend
     
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  8. rollieman

    rollieman Silver Member

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    Thank you Hellcat_child253 because I'm a rank armature in this subject matter.
    I've based my calculations purely on the Wheel / Tire Comparator: Custom rims, wheel tire packages for your ride - RIMSnTIRES.com and by applying the Tire Track explanation which states for every .50" change in rim width, the tire section will correspondingly change by approximately .20 (with wider rims reducing and narrower rims increasing section width).
     
  9. HellCat_child253

    HellCat_child253 Gold Member

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    No Problem at all that's what this community is all about helping one another and sharing vital knowledge of our cats.
     
  10. Puffy

    Puffy Gold Member

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    I currently have 10.5s with a 305/35 with no issues. I ran a 295/40 tire on my stock 9.5s with no issues in the past with no issue as well. I wouldn't recommend putting a 40 series on an 11" wheel. Is there a reason you are staying away from 35 series tires?
     
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  11. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    I don't think you will have an issue. Unfortunately I have yet to get a chance to take a tape measure to a HC. I actually just put 4 tires on a charger HC an hour ago, but he was waiting and was in a hurry so I was not able to measure. By the way I love these cars, they are the pinnacle of performance engineering and the interior is super nice as well.
     
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  12. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    Also with an 11" width I would run a 315/35-20. :cool:
     
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  13. rollieman

    rollieman Silver Member

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    Puffy I just prefer the looks of a taller tire in the back whereas the 295/40/20 is .25 radially taller than stock (29.2 vs 28.7) and yes I have thrown out the idea of using a 11.0" wheel in favor of stock 9.50 wheel.
    Thank you !
     
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  14. rollieman

    rollieman Silver Member

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    I decided against using the 11.0 rim and will mount the 295/40/20 tires on the stock 9.50 wheels to avoid any possible rub concerns with the wheel wells.

    Thank you!
     
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  15. dragrcr

    dragrcr Gold Member

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    It likely will not rub with an 11" rim. If it was my car I would go for it. I now have 18X10.5 +25 rims and I have plenty of clearance. I run a 305/45R18 ET Street "R" tire that is 29.1" tall. The closest place it is possibly going to hit is that rib in the front of the wheel well/ plastic tub. And that will not be catastrophic unless it is a major interference (which it's not). Keep in mind you still need to do the wheel tub mod I posted on here to keep the lower bottom from rubbing.

    Keep in mind there is way more extra clearance to the inside than there is on the outside. Way more. You seem to think it is equal inside/outside?

    . DSCN1859.JPG DSCN2005.JPG DSCN2010.JPG DSCN1997.JPG
     

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