Tire Size

[msbaugh]

Quick stupid question, my daily driver is a 5.7 hemi charger r/t... and its time for new tires.  the ones I've always had are the stock 245-45-20s on all 4.   I was thinking of getting a different size in the rear, maybe a 255-45-20 in rear and leaving 245-45-20s in front... this would give me an extra 1/2" of width in the rear as well as about a .354 " taller tire. 
I know this would probably hurt performance, but would it really? It doesn't seem like that much of a difference height wise and I like the wider tires.  The extra width may even actually help with acceleration. Also, I have a pretty manageable tuner that I'm good at using, so I can correct my speedo and ABS brakes very simply adjusting to tire height.  Sorry I hope you guys don't mind me posting about this car, I know most Mopar guys hate the new 4 doors. I just don't care enough about it to be active on a modern Mopar site.
What do y'all think?

[jimynick]

Where's the downside? If you like 'em AND are able to re-calibrate for them- go for it! It's your car. 

[msbaugh]

I guess the downside would be worse acceleration, I'm just wondering how much worse it can be

[Fastd]

In my opinion it is not worth switching sizes in the rear. I speak from experience. I have about 12 years of tire experience under my belt. Any slight gain you may get would Not out way the benefit of having the same size at all 4 corners. IE: lack of rotation (very important for to get the mileage out of these tires), Balanced handling and braking as well.

I put a set of SRT8 wheels with the factory 245/45r20 on the fron and 255/45r20 on the rear. They were Badyear tires as I like to call them. got less than 12000 miles on cause I could not rotate them. The front edges worn due to the Wifes city driving, constant turning starting and stopping.

Pulled them off went 245/45R20 all 4 corners and have not looked back. Oh I have not problems hooking up or cornering, I like to to push it.

Again just my opinion.


IS your an 08 ? I beleive that was the first year you could get the 20 inch wheels on the R/T. Do you have automatic climate control? If so you can add Auto headlamp feature, He He. 

I 'm actually working on Adding memory seat feature to the drivers seat. (Hopefully it can be done) I'm 6'4" and the wifes 5' it's a pain to adjust the seat and pedals between us

[msbaugh]

Thanks for the advice.  Yes it is an 08 with the R&T performance package so it was upgraded to the 20 x 8s.  You could get them in 2007 I think which was the first year.  I do have automatic climate control, what do you mean auto headlamp feature? lol
Luckily Im usually the only one to drive it so it stays at my 6' 2'' position

[Fastd]

With auto headlamp the lights will turn on as it gets darker outside. It uses the climate sensor on located on the dash for this. I rarely hava to manual turn the lights on/off. This feature was only available on the 300c in 05/06. check out the link below.

http://www.lxforums.com/board/f92/installing-automatic-headlight-switch-factory-11331/
 

         

[72bluNblu]

If the 255/45/20's will fit in front why don't you just go that size all the way around? The change in height is pretty minimal, you probably wouldn't notice any change in the acceleration. Not sure how the steering feels on those cars, the wider fronts might make it feel a little heavier, probably not much though. I know going from the 225's I had on my '72 Challenger to the 275's I run now made a HUGE difference in the steering feel, I'd say its a lot better now. Before with the power steering it was so boosted it hardly felt like you were driving.

[Jamie]

You will never notice a thing going one size up. I did on my R & T charger.you could also go 275-40-20 ,much wider contact patch and close to same height.  The only thing I hate besides cylinder de-activation is the little tiny silly looking tires these large cars have. From the back they look like neon tires on a bus!!!! 
 Head to the charger forums to see pics of larger tires.