Tire sizes

blk_srt · #1 03-21-2006, 11:40 PM

right now I have 225/40/18's on my car and they are 9 inches wide and I want to get some BFG's next but I'd like to get some that are a little thinner sidewall and 10" wide. would a 255/35/18 be what I'm looking for? I have no idea how the sizes work either

scottsee · #2 03-21-2006, 11:43 PM

225 is the width in millameter for the contact patch, 40 is the aspect ratio from the contact patch to the rim and 18, well duhh..

Reamber any aftermarket rims/tires will effect your wheel speed sensors, altering you MPH, but more importanly change your gear ratio!

blk_srt · #3 03-21-2006, 11:45 PM

Well I dont think it will change much considering I already have 18's and my spedo is dead on

scottsee · #4 03-21-2006, 11:50 PM

Quote:

Originally Posted by busted car

Well I dont think it will change much considering I already have 18's and my spedo is dead on

LOL. Got me their.

Thor06 · #5 03-22-2006, 03:12 AM

My speedometer is dead on with my 17's too. I did that on pupose. Theres a couple formulas at www.tirerack.com that I used to figure out what size tire would be the same outside diameter of the stockers. My guess is you just happened to get one pretty close to or exactly the same size as the stock ones.

xavier3jr · #6 03-22-2006, 07:22 PM

DO NOT GET 35'S!!!!!!!! i work at a tire shop and day in and day out were changeing 35's because they hit a pot hole and blew there tire out or ordering new rims because they hit a pot hole and cracked there rim NO LOWER THEN 40's!!! 245/40/18!!! trust me!

xavier3jr · #7 03-22-2006, 07:24 PM

[quote=scottsee]225 is the width in millameter for the contact patch, 40 is the aspect ratio from the contact patch to the rim and 18, well duhh../QUOTE]
actually you are wrong. to us yes thats it but the first number actually determins the highth and the 2nd number determins the width when they are makeing a tire just thought id share that....

i had to take tire class's before i could work there

blk_srt · #8 03-22-2006, 08:40 PM

The only reason I'm considering 35's is because fromt time to time my 40's look just plain to big lol I dont know how to put it but I want thinner, wider tires(my friend made fun of me for saying that

) idealy I'd like something that is at least 9.5" wide but perferable 10"

xavier3jr · #9 03-23-2006, 06:33 PM

well what width are your rims??? if your rims are wide enuff you could go with the 245

blk_srt · #10 03-23-2006, 06:57 PM

7.5"

Talon69 · #11 03-23-2006, 07:30 PM

[quote=xavier3jr]

Quote:

Originally Posted by scottsee

225 is the width in millameter for the contact patch, 40 is the aspect ratio from the contact patch to the rim and 18, well duhh../QUOTE]
actually you are wrong. to us yes thats it but the first number actually determins the highth and the 2nd number determins the width when they are makeing a tire just thought id share that....

i had to take tire class's before i could work there

YOU ARE INCORRECT The 1st number is the width and the second number is the height. I worked at a tire shop for awhile before i got a kick ass job as a QA for trains

blk_srt · #12 03-23-2006, 07:33 PM

ok well let me make it easy, I want a tire thats 10" wide and low profile so what would be better a 245/35(40)/18 or a 255/35(40)/18?

Black99GST · #13 03-23-2006, 07:54 PM

yeah, i want to get some rims and tires, and i want wide tires, i've been looking into 18" rims, but i've been pushed away because of cost and weight... so... I'm thinking 17"x7.5" rims with 235/45/17 tires. how wide would they be? because i want them as wide as i can (400 WHP GST's need traction too...)

blk_srt · #14 03-23-2006, 07:56 PM

my 18's are pretty light, actually the tire weight more than my rims do

Black99GST · #15 03-23-2006, 07:59 PM

everyone has told me to get 17's For weight reasons... also, 17's are cheaper... so i'll just go with that unless i can find a killer deal... any input on my "setup"?

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