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I am looking at putting slightly bigger tires on my challenger. I have the 20in rim. It's 245/45. I am looking at trying to put 275 on the back, but was wondering if the rim would be to small to put that size tire on that rim? I don't want to replace the rims because I like the stock rims. I read another forum on here, but was outdated by about 4 years or so. I would like to go bigger then 275, but don't think that would happen at all. Anyone on here experiment with different tire sizes on the 20in rim?
 

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Largest suggested safe size for an 8" wide wheel would be 255. I am sure there are people that will tell you they run a 275 with no issues, but I'll just tell you the recommended safe size. Here is a good reference

https://www.budnik.com/helpful-tire-info

9" minimum suggested for the 275/40r20

A Guy
 

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Some have squeezed a 275 tire on an 8 inch wheel but it's not advisable. For a 275 tire to wear and perform properly, it needs at least a 9 inch wide wheel. Check out the second diagram on the following tire/wheel fitment illustration.

 

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I know a guy who put 275s on his 8" wide wheels. Looked like the tire was over hanging (?) the wheel. I guess if your cruising and not pushing the car, it might be okay but from the looks of it, I wouldn't want to hit an on-ramp or take a tight turn at high speeds.
 

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May I ask why you want to go with a bigger than stock tire on your stock wheel? I actually thought of the same, but just don't want to risk putting a tire that is too big for the stock wheel to safely handle, and I have a hard time thinking that a 255 would offer enough extra traction to even be noticeable. I may start putting some track time in my 09 RT in the spring, and if I can't get consistent times with my stock tires, I may go with some track day only 18X10 inch wheels and put some Drag Radial 305/45/18s. For everyday driving the 245's are a decent tire for the Challenger
 

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255/40/20 for the 20x8" wheel or 255/45/20?




Wider is better, even if it's a bit!
255/45 is what the rear staggered tire option was on '08 - '14 SRTs
 

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Discussion Starter #9 (Edited)
I appreciate the info. So, my next idea is to do a 20x10 rim or 20x9. I was thinking it would be cool to be able to do a 285 or so on the back and then do the stock 245 on the front or go up to 255 on the front. Just trying to figure out what size rim do I need to go up to, to get 285 on the back and that's if I can do that size rim without causing any issues. I feel like 285 would be a nice fit and would give a great look. Here is something I am looking at.

https://www.tirerack.com/wheels/WheelCloseUpServlet?target=runWheelSearch&autoMake=Dodge&autoModel=Challenger&autoYear=2017&autoModClar=SXT&wheelMake=Verde&wheelModel=Parallax&initialPartNumber=V39989015B&selectedRear=V39999020B&wheelFinish=Black+Painted
 

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Discussion Starter #10
May I ask why you want to go with a bigger than stock tire on your stock wheel? I actually thought of the same, but just don't want to risk putting a tire that is too big for the stock wheel to safely handle, and I have a hard time thinking that a 255 would offer enough extra traction to even be noticeable. I may start putting some track time in my 09 RT in the spring, and if I can't get consistent times with my stock tires, I may go with some track day only 18X10 inch wheels and put some Drag Radial 305/45/18s. For everyday driving the 245's are a decent tire for the Challenger
Really the only reason I want to do it is for look. It just so happens to have a couple pluses to doing it as well.
 

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Discussion Starter #11
I was wondering if I can do 285/30zr20 in the back with 245/35zr20 on the front? I'm just confused about that middle number if they have to be the same or is it okay for them to be different?
 

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Those sizes, as far as overall diameter are pretty close. The thing is compared to original tires. If you change from original sizing, your speedometer won't be correct. It might not be far off, just depends on size

Your new sizes compared to each other

Clipboard01.jpg

Your new front size compared to original

Clipboard02.jpg

Compare sizes here:

https://tiresize.com/comparison/

The "middle number" is the aspect ratio. Bigger number, taller sidewall. A 245/45R20 is the same total height as a 275/40R20, and a 315/35R20

245/45r20 in front (stock size), and 285/40R20 are pretty close. If you go 35/30 that's a short tire, you will have more fender gap.

A Guy
 

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I was wondering if I can do 285/30zr20 in the back with 245/35zr20 on the front? I'm just confused about that middle number if they have to be the same or is it okay for them to be different?
The maximum size tire for a 9 inch wide wheel is 275. If you want to go bigger, you will need a 10 inch wide wheel.
 

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Not to highjack, but I have a question very rated to this. A Guy almost answer this already.


I have a 5.7 R/T with 20X8 wheels and 245/45/20. Plan to change out the rims and go with 20X9 with 275/40/20s. That will work without any problems? No rubbing, won't stick out and look silly right?

Always thought the 245s on a 9" rim look a little odd.
 

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As long as the offset is the same as stock 20x9 it will for sure. Probably others who could better answer on different offsets, and what works best. A Guy
 

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Not to highjack, but I have a question very rated to this. A Guy almost answer this already.


I have a 5.7 R/T with 20X8 wheels and 245/45/20. Plan to change out the rims and go with 20X9 with 275/40/20s. That will work without any problems? No rubbing, won't stick out and look silly right?

Always thought the 245s on a 9" rim look a little odd.
It would depend on the wheel offset - a friend has a '13 R/T with the '08 - '10 SRT Alcoa (they're 20" x 9") + 275/40 and had to use spacers on the front to avoid rubbing.
 

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It's funny that tire rack recommends and offset of 18mm for 8.5" but 25mm for 9". Is there that much difference between an R/T and Scat pack?
Brembo hardware vs. the Bosch brakes on 5.7s - calipers are much bulkier on Brembo
 
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I am looking at 255/45 and 255/40 for my 20x9 wheels.
What would look the best ? The 40 or 45.
I have the 245/45 on the car now
 

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I think you'll find more choices, and starting at lower prices if you go 255/45R20. unless you go up to 275/40R20 (which will fit). They are both close (to one side or the other) to the 245/45R20. The 255/45 will have a taller tire if you aren't lowered and want to fill the fender a bit more. The tires that come in both 245/45 and 255/45 seem to be a little lower priced in the 255/45 strangely enough. You only gain a little width with the 255s, and perhaps a bit more rim protection.



A Guy
 
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