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Discussion Starter · #1 ·
I have a 2008 RT/RT performance package (daytona 20's) I've heard mixed opinions on if they are 8" or 8.5"

Either way I think the 275/40's are oversized as far as recommended rim width but I've heard of people on here saying they've got as big as 295's on the rear on the same rims...

I am looking at and torn between the Yokohama Parada X-spec 255/45 20's to remain within spec or going slightly over or pushing the limits and going with the Hankook Ventus ST RH06 275/40 20's....

The hankooks have less review info but they look better and have a higher speed rating, while the yoko's have a lower speed rating, not as attractive a tread design but glowing reviews and even great (#1 in class) comparitive reviews from another unmentionable site....

What kind of ill-effects can I get from running the "out of spec" tires... wearing the middles, or is it risk of going around a corner fast and popping of the rim.... I'd really like to put this to bed... On that note... I'm heading there myself...

If you got any insider info on which is better as well, that's always appreciated... There really was no direct comparison of these found anywhere.... I'm looking for a tire that doesn't blow goats like the OEM Goodyear RSA's. I drive easy with the family most of the time so I want a quiet comforatble long lasting ride but when I let loose and have fun, I like the tires to take anything I can give em, so performance is very important to me as well... The good years were ok when new but they wear fast and horribly, I am barely at the wear indicators at less than 17k and have been hydroplaning badly and generally have no confidence in my grip anymore. They have always made vibrations and noise that I assumed was the drivetrain but from other reviews I suspect is them... We'll see soon enough.

BTW, these seem to be asymetrical tires, both my choices, so do these only get rotated only same side front to back instead of the standard cross the rears to opposite fronts and move the fronts straight back....

Thanks in advance, sorry for the long post.
 

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Thank you for the post. We would be happy to help you with your tire needs.

According to my information, the factory Daytona wheels are infact 9" wide. This means you can run the 255/45-20 or 275/40-20 as both sizes are approved for a 9" wide wheel. From what you describe, I recommend you run the RH06 in size 275/40-20. This tire handles very well in both dry and wet conditions. With proper rotation (front to rear only) you can expect a smooth and quiet ride. This model also offers a 50K miles tread life warranty which is fantastic for a performance tire.

As far as mounting a tire on an unapproved rim goes, tires are designed to flex in certain areas of the shoulder, when you pinch or stretch a tire on a wheel that is too narrow or too wide you force the tire to flex where it is not deigned to do so. This makes the tire hold more heat and heat (a tires worst enemy) breaks the tire down faster resulting in shorter life and higher chance of failure. Also every major brand tire is covered by a manufacturer's warranty for workmanship and manufacture defect. This warranty is void if the tire is mounted on a wheel outside the tire manufacturer’s recommendations.

I hope this information helps. If we can be of further assistance please let us know.

-Matt
 

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Discussion Starter · #3 ·
Not sure where everyone gets this conflict of information but as far as I can tell they are, in fact, 20x8 rims... the service department looked it up in their parts window and it comes up as a 20x8... Now, the chryslerpartsdirect site lists it as a 20x9.... but then, when you open up the actual item it doesn't specify, they are just listed under the 20x9 rim category along with the SRT rims as if it's an alternate finish or something...

So I guess I'll be going with the Paradas... I don't need any more problems or reasons for them to deny warranty. They are convinced that going with wrong size tires will mess up traction control computer... which as long as they are all the same size and the same circumference as originals I know it's fine, I worked on guided missiles, everything to a computer is delta(or change) in this case rotational speed, there is no way for car to compute tire width. However, I don't want them making notes on my car's history that will invalidate my lifetime powertrain warranty...

This post is for the benefit of anyone who is going through the same research process, hopefully it will help someone else.
 

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If you really want to know the true width of the wheel, take it off and look on the back. The wheel size and offset will be stamped somewhere on the spokes.

Going with the Parada Spec-X is not a bad option at all. It's not as performance geared like the RH06 but the ride quality is fantastic and it does very well in wet and light snow conditions. This model is also unidirectional like the RH06 so once mounted, the tires can only be rotated front to rear.

-Matt
 

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Discussion Starter · #5 ·
Thanks. Didn't think to look on back... I'm probably going with the yokos but good to know. I'll be ordering soon, gotta scrape together the cash... didn't think these'd be bad so soon, the stock good year RSA's really do stink!
 

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If you really want to know the true width of the wheel, take it off and look on the back. The wheel size and offset will be stamped somewhere on the spokes.

Going with the Parada Spec-X is not a bad option at all. It's not as performance geared like the RH06 but the ride quality is fantastic and it does very well in wet and light snow conditions. This model is also unidirectional like the RH06 so once mounted, the tires can only be rotated front to rear.

-Matt
Just replaced my brake pads w/ some Wagner pads and I looked at the stamp code on the 20"chrome clads. It starts off w/ 20X8, so they are a 20 x 8 rims. That means a 275 size tire wont work then, correct?
 

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Just replaced my brake pads w/ some Wagner pads and I looked at the stamp code on the 20"chrome clads. It starts off w/ 20X8, so they are a 20 x 8 rims. That means a 275 size tire wont work then, correct?
The approved rim width range for most tire models in size 275/40-20 is 9" to 11" with 9.5" being the most ideal. The 275's can certainly be mounted on an 8" wide wheel but it is not recommended. Tires are designed to flex in certain areas of the shoulder, when you pinch or stretch a tire on a wheel that is too narrow or too wide, you force the tire to flex where it is not deigned to do so. This makes the tire hold more heat (a tires worst enemy) which breaks the tire down faster resulting in shorter life and higher chance of failure. Also, every major brand tire is covered by the manufacturer's warranty for workmanship and manufacture defect. This warranty is void if the tire is mounted on a wheel outside the tire manufacturer’s recommendations.
 
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