Quote:
Originally Posted by kandor
In researching the idea of putting 20" rims on my 2006 awd 300c I've come across several things that give me concern:
The offset for the awd is said to be 55mm, yet many people seem to recommend 42 - 45mm for a replacement rim? Confusing...!
People report that gas milage will suffer going from a 225 (stock on 18") to a 255 - this makes sense to me and I'm not that interested in making the milage worse - but how much worse is it?
General performance concerns - one thread talks about how the 300c is engineered for an 18" rim i.e. the brakes, unsprung weight etc. I'm unschooled about this so....chime in!
Potential rubbing as reported in this thread.
I like the look of 20" rims and also like the look of a wider tire, but I don't want to drop $2500 on a set of rims and rubber and later regret it because of the above mentioned issues.
What are your thoughts?
Thanks,
Kandor
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Someone with +40 offset said it was about dead even with the fender so that should tell you that +42 or so would make it a good setup. I would doubt gas mileage should vary more than 1 or 2 at most mpg.
The car is going to be fine varying from the stock setup, there are cars out there that are actually engineered for performance, this isn't one of them. We would have seen problems listed on here before when people put 22's and 255 tires on if the case was that the car was engineered for the exact wheels and tire sizes that are on there. Here is a tire size calculator for you
http://www.1010tiresdotcom/tiresizecalculator.asp That will let you know what size tire to put on a 20inch wheel. For example, putting a 245/45R20 tire on a 20inch wheel will be 6 hundredths of an inch different than a stock wheel and tire combo, total diameter is 28.68 vs 28.62 for stock.
Go with the 245 tire if you want to prevent rubbing, or even 235 if you want to be 100% sure.
