From my own experience, 245s slipped too much. Morning due, light throttle, concrete, traction control on, rolling at 45, I would slip it I blipped the throttle... which is unsafe im my opinion.

Some of that is due to the all seasons, some of it is due to the tire width. If you do get 275s, make sure you get at least a 9" rim, 9.5" is ideal

 

Very noticeable difference from what I've experienced.

The stock 245's would go into smoke just looking at them. 😂

The Conti 275's are much better in every way.

Good luck

 

Big difference

 

is there that much difference to upgrade to the 275"s

Well, besides the obvious 30mm difference, the stock Goodyear RS-A’s are some of the worst tires I’ve had on a vehicle (I have them on my Charger).

A better compound in the same width would be miles better, but a wider tire even in the same terrible RS-A’s would most likely be much better.

For comparison, I have the 275 all-season Perelli P-Zero’s on my Challenger. While certainly not the best tire out there, they are immensely better than the 245 RS-A’s that come standard on the Challenger and Chargers.

 

Tire Compound makes more difference then Size.......

 

Get Summer Tires like Firestone Indy 500 or Nexen Sur4g. 275 or greater.

 

I’ve actually spied some P275/40R20 Pirelli P-Zero Summer take-offs with under 200 miles on them for $500.

I may actually buy them before they get gone, then mount them on a set of these American Racing Wheels:

 

Summer performance tires of any size won’t slip like All season anything. If you must have all seasons you need two sets of wheels and tires or a different car.

 

My experience with the OE (optional) summer performance 245 Goodyear Super Car tires does not support this statement. Regardless of ambient and road temperature they would basically go up in smoke with minimal throttle pressure in first and second gear and could be spun easily in third. On the other hand the 275 Continental DWS 06+ have far greater traction in all conditions. If you want to spin them you have to put a little effort into it.

If you go wider, you also have to get new wheels. The wheels on 245 cars are 9". You need a minimum of 9.5" wheels to use a 275. Mounting a 275 on a 9" wheel just rolls the tread up into the sidewall and it remains a 245 (which is why people claim to have no fitment issues when doing that... it narrows the tire when you mount it to a wheel that's too small).

Most 275 tires are rated for use on 9" to 10" wheels. I have seen many 275's on 9" wheels with resulting correct contact patch.

 

12.5% wider can only help. I think a lot has to do with members also changing brand/make of tire. Better traction tire AND 12.5% wider

A Guy

 

If you go wider, you also have to get new wheels. The wheels on 245 cars are 9". You need a minimum of 9.5" wheels to use a 275. Mounting a 275 on a 9" wheel just rolls the tread up into the sidewall and it remains a 245 (which is why people claim to have no fitment issues when doing that... it narrows the tire when you mount it to a wheel that's too small).

 

Wrong.

275/40/20's need a minimum 9" per tire manufacturers.

They all show what width range is acceptable.

Conti says 9", and they work well. No contact patch issue with these.

 

I wanted to keep my forged Alcoa aluminum wheels on my 2009 SRT but wanted wider tires. A 275/40-20 will safely work on a 9-inch wheel. I can see a noticeable increase in tread width over my old 245/45-20 tires.

 

IMO the right tires give the car a certain "attitude" 315 on the rear. New Rims Required.

 

FWIW I have 315 nittos on the back and in cold weather they smoke with more easy than my 245 all season tires. The 245s look too skinny for a muscle car but other than that they should give better MPG as they are thinner and have less rotating mass....not to mention they are cheaper to replace.

 

Here is a photo of two new 245/45-20 and 274/40-20 tires. Even unmounted, there is a significant contact patch difference.

 

Here is a photo of two new 245/45-20 and 274/40-20 tires. Even unmounted, there is a significant contact patch difference.

View attachment 1114489

It would be nice to take a yard stick to those and tell us the width of the tread, the overall width and the overall height. The DOT should be disbanded for many reasons, one of them being their inability to assure every xxx/yy-zz tire matches every other xxx/yy-zz tire in size.

 

My 2019 Scat M6 came from the factory with lightweight forged wheels with 245 tires…that should have been illegal. First gear pulls were scary..tires could not hold the power and the rear was dancing all over the place. Upgraded to 275’s in all four corners and problem solved…highly recommend going 275.

 

🤷‍♂️Not sure about all that. What I know is that 9.5" rim is ideal for 275/40/20. Why argue about cooking a frozen pizza in a toaster, just do it right the first time and put it in the oven 🤣.

It read to me like you are advocating for running 275/40/20 on a smaller rim. Granted I didnt read everything, a couple of the links you provided suggests that it is acceptable to run a 275/40/20 on 8", 8.5" and 9" rims. I will agree that 9" is the absolute smallest rim for a 275/40/20, but for ideal contact patch and proper rim-to-tire fitment, I suggest a 9.5" rim.

 

Wow, lol............didnt think i would get this much info.........im gonna go with the 275 later this summer........but im not having too many traction problems with the 245"s..........i can take off pretty good without spinning them to death. You boys must have a heavier foot than me........lol

Once thanks for the great info

Rich

 

Just another vote for the 275, on the rear especially. I kept the 245 upfront so now have the staggered set-up. I also experienced way too much tire spin with the Goodyears that came on the car. I definitely feel the difference but you need to get a quality brand as well. With tires, you get what you pay for. I went with the Goodyear Exhilarate which is amazing on both my '14 Mustang GT and now my R/T. Just as pricey as the Michelin Pilot Sports but it's about as good as it gets. 'Top of the line' and Made in USA. They look great on the R/T as well.

 

21 pounds? I'm sorry, but I can't see how that would safely handle the weight, speed and cornering forces put on those tires. Maybe if you drove it like a grandpa

 

The 275s fill the fender width better and the 9.5 rims are the way to go. Tire brand affects traction immensely. My 275 Firehawks grip better than my friend's 315 Pirellis.

 

If you can afford it, I had good experience with Michelin Pilot Sport 4S

 

Inches matter 😂

 

If the DOT would step up to the plate:

245 tire should be 9.6".
275 tire should be 10.82".

 

Wow, still talking about these tires.........lol, i think i might go smaller than the 245"s..............thanks for the info guys.

Rich

 

If you thought that was funny, ask about oil or oil filter

 

lol, go with the 275's, you will be happy.

 

Upgraded from the stock 245s to 275s on my Challenger RT and never looked back! Here's a thread with some more info on what that decision looked like for me, hope it helps!

https://www.challengertalk.com/threads/2015-rt-with-wrt-clearance-question.514105/

 

I only wish that I could find 9.5 inch wheels similar in appearance to my factory 8-inch machined wheels with granite pockets that came on my 2022 Challenger RT Plus. I could keep 245 tires up front on the factory 8-inch rims, but different 9.5 inch rear wheels to fit 275 tires would ruin the 4-wheel match in appearance. I've yet to find a wheel design that comes close to the standard RT Plus wheels (no Performance Handling Group package). I am hesitant to swap out factory wheels for aftermarket cast wheels. I wonder if 9.5 inch MOPAR wheels, normally available for the PHG equipped Challengers, would fit the front spindle on my 2022 RT Plus.

 

Frame it tub it

Weldcraft Wheels

weldcraftwheels.com

 

Wow, now that's a real possibility for me. Will the wheel maintain its roadworthiness? I guess testimonials in the gallery may testify to their safety.