I am new to the site and I thank everyone for all the info i have recievd about the RDX. Just purchased mine 1 week ago and purchased 20" rims I was wondering about tire size for the 20 x 8.5 rim. If i get a 255/45/20 toyo proxes ST tire does anybody know if this tire size will cause any rubbing? and if my spedo will be off?any suggestions on tire size? I would like to keep as close to the stock in terms of comfort as possible.
Thanks for your help

 

i had 245/45 on my 20s

http://www.miata.net/garage/tirecalc.html

 

congrats on the ride, post pics. !

 

Here's some info I posted in an earlier thread regarding 20" tire sizes:

You're considering 255/45/20, which have an even larger diameter than the 245/45/20, so the speedometer will read even lower than I mentioend above. Probably not very smart, unless you figure out a way to re-calibrate the speedometer.

Also, you mention wanting to retain a stock level of comfort. This simply will not be achievable with 20" wheels while retaining the correct-sized tires, as you're giving up a lot of sidewall thickness, which results in a stiffer ride. Plus, your handling and acceleration will be adversely affected (much higher unsprung weight, unless you're getting some VERY lightweight 20" wheels, which I doubt is the case), your replacement tire costs go up, tire availability decreases, you have greater risk of bending a wheel (due to less sidewall protection), higher theft rates, more likely to "curb" wheel when parallel parking, etc.

But they'll look really cool, right?

 

ddb, come on, theres NOTHING WRONG with puttin 20's on, hell, infiniti comes std with 20's and alot of other higher end manufact are moving that way too.

there will always be bigger....remember when 16 inch was uppermarket.....dont hate on the 20's.

 

I didn't say there anything WRONG with 20s, but I think it's important to be aware of the pros and cons of the decision. The ONLY "pro" is that they look nice.

 

the way u wrote look cool right? sounded pretty sarcastic,

 

Thanks for all the input.

DNP when you had your rdx did you have 255/45/20s? or 245/45 i was reading your other posts and that is what was stated.

by the way how did your rdx ride when u had 20's compared to stock when you had it?

I ask this cause i got the same wheels, but on a black rdx. Sorry to copy but your pics where awsome.

 

oops im sorry it was 255/45s its been so long lol. the ride was a little rough but nothing that my 2 year old at the time couldnt handle. it was just a tad bit rougher than stock. plus the wide 255s looked great!

 

Thanks last question. do you remember when u had the 255's on if it rubbed anywhere or was your turning radius more limited then stock.

thanks again in advance for your help.

 

did not rub at all. not a single issue with the tires/rims