im actually getting a new set of wheels, but i have 18x7.5's kicking around i might use for daily driving and the other a track set

could i put 245/40/R18's on the 7.5 inch? or would that not fit well?

8.5 X 18" ET30 FRONT 235/40/18

9.5 X 18 ET35 REAR 265/35/18

Stock height....
Will these fit?

^Yes.

And to answer learycd's question. 245 is usually the biggest you want to go with the stock 8" wheel. So with a 7.5" wheel I wouldnt go any bigger than a 235.

well, i got my wheels and tires on, thanks to this thread.

now i just gotta resolve some rubbing issues. rubs the front against the plastic inside when i max out the steering, and the rear just needs to be rolled. i hope.

i actually just looked on the bridgestone website and they say for 245/40/R18 the smallest is 8 inches

BUT for 245/45/R18 the smallest is 7.5 inches. any reasoning for this?

EDIT: is it just because there is more sidewall to go around?

the sidewall size does not calculate the sidewall exactly. a 45 series tire will have more stretching capacity than a 40 series tire.. one because of the bigger sidewall, but there is also a lateral calculation in that also... one that im not aware of how it works.

I still would not put that on a 7.5 " wheel... would just look way too goofy.

I want to know why lower profile tires are rated for going on wider rims. It sounds counterintuitive.

Lower profile = less sidewall and less adaptability in width

Higher profile = more sidewall and more adaptability in width

The tire manufacturers have recommended widths for different rim widths...check it out

http://nittotire.com/#index%2Etire%2Einvo%2Esizes I'm talking about where it says 245/45/17 and 245/40/17 have different approved rim sizes. It says the 245/40/17 is good for 8-9.5 with 8.5 being best, while 245/45/17 is 7.5-9 with 8 being best. Every tire manufacturer I've checked has it this way.

Overall tire width matters also......The tire width and profile are ratios...

In this case the 245-40 is a wider tire than the 245-45..if they were the same width you could stretch the 45 over a larger size of rims...doesn't mean it's a good idea.....as the flexier sidewalls need to be supported better....

Not so easy really...thats why \i look at what the manufacterer recommends and go from there

I knew some tires were wider (Neova, Azenis, etc.) than the numbers let on, but I guess I never thought there would differences between profiles on the same tire lol. Damn millimeter should be standardized or something.

http://icanhascheezburger.files.word...by-algebra.jpg

I'm thinking of these rims in 19x8 front and 19x9.5 in the rear with a 40mm offset. 245/35's front and 275/30's or 255/35's in the rear. Tein S Techs and Tokico D specs. Will they fit?

Thanks.
blstony1


http://www.tsw.com/img/vairano_black_reg_pop_white.jpg

looks ugly, but yeah they will fit.

So that means you wont be putting them on your car I guess......:)

Thanks for the response.

thanks for your help guys, ill pick up 235s

need help on my rear tires. i don't know if i am posting in the right place but i got a 19x10 +43 with a 285/35/19... only reason why i went with those tires because i got them dirt cheap. i already rolled and trimmed some of the rear bumper but it looks like the white mounting tab for the rear bumper is where my tires are getting chewed up at. i was wondering what i can do to not rub on that part. i tried throwing some camber but no go.. i want to run a skinnier tire but this needs to do for now. can i cut off the tab? need help!

pics?

don't have the picture of the white tab. (looks like that where the rear bumper fits up to the fender) but heres a pic of the whole car
https://i455.photobucket.com/albums/...3/P1010741.jpg
http://i455.photobucket.com/albums/q...3/P1010744.jpg

^Wow your car looks very nice man!

19's should be 30 series at the most...tires are kinda tall.....

evey your car = sex

i agree that the 35 series is too tall.. i wanted to go with a 275/30 tire but the tires were $100 bucks so i had to try to fit it. somebody has to have a solution for that white bracket looking thing that mounts the rear bumper to the fender. still need help... and i am glad that the wheels came out great, thanks

First off - Evey, your car looks EXTREMELY CLEAN :yesnod:

Second, a pic would really help, otherwise i'm gonna have to go in my wheel well and see what you're talking about (which i'm a really lazy guy, so that's gonna be unlikely :()

and 3rd...(O/T)

i just got some new 245's KDW2's on teh stockies. Looks and feels like sex. I highly recommend :)

okay i took this picture from the Shine Auto Project forum so disregard the red squares, but right above the guys right index finger is where my tire is rubbing against when i hit a good dip and bump. after looking at this picture it looks like there is no way of cutting that tap without my bumper not fitting right. i guess i might have to go to a skinnier tire or raise my coilovers. give me some suggestions guys!
http://img345.imageshack.us/img345/9...img23282rd.jpg

What is your spring rate?
How much are you lowered?
What size tires are you running?