If you are not lowered, you can run any factory challenger wheel. I had (barrowed) SRT hellcat wheels on mine for a short time with 275/40/20.
Hemi4us

 

If you don't use a 3mm spacer up front then you're probably going to rub at full lock, particularly when backing up. Otherwise, no issues.

 

Clearance

With no spacer I have only 3/16 clearance between tire and control arm at top. Is that safe?

 

I was wondering the same, being that I have been looking into this possibility. Like the look of the WRT rims and was trying to see of I could install them with the mentioned 275/40/20 tires on my RT.

Any information would be appreciated!

 

The clearance between the tire and control arm is common. My SXT has that. But they move together, so should never get closer to each other barring the tire really deforming for whatever reason. And since 245/45, 275/40, 315/35 are all the same height, a change to one or lower wouldn't be an issue

2015 SXT PLUS Eibach Pro

Hey I'm new to this chat and I'm looking to have the Eibach Pro installed on my 2015 Dodge Challenger SXT Plus. I was just wondering how much does the install cost and is t only the springs that are being replaced or will this cause a domino effect for other things to be change? Sent from my...

www.challengertalk.com

A Guy

 

Update
So I got my hands on some WRT rims with an offset of 19.2 at an awesome deal! I was also able to purchase a used 275/40/20 tire, with the intention of checking the fit of this combo on the front.

Took pictures of the existing clearance with my Hyper Black rims and the stock 245/45/20 tires.

Finally got the new tire installed on the WRT rim and mounted it on to my car to check the fitment. Looking at the fit I did not see any rubbing issues! Even though the control arm clearance from the new wheel was a reduced a bit more. This gave me piece of mind in knowing I would be able to upsize from my 245/45/20 tires into 275/40/20 on my new WRT rims!

Took pictures for those interested.

 

Finally completed this mod over the long weekend! Changed out my existing rims for the WRT rims I purchased. Love the look with the wider stance on the new 275/40/20 tires. Got my vehicle aligned in the morning and have not had any issues with the new rims and tires.