After one day of driving on my 235/40/18 wheels. I've concluded I could use more rubber. I want to go with a higher profile tire but I'm not sure if I should get 225/45/18 or 235/45/18.

My questions are if anyone has experience with these tire sizes which is the best for comfort? I'll be selling the 2 day old 18" tires I'm roling on now when I buy higher profile tires if anybody is interested.

 

I believe 235/40/18 are the correct size for your wheels.

If you go larger, you're speedo's going to be off.

 

how was the ride with 40's??

i just ordered 18's with 235/40/18 on them. I was thinking about goin with a 45 tough for a lil more rubber.

 

I've had mine on since Sunday, and the only thing I've noticed is wheel hop when I toasted this popop in a GS300 this morning. I was afraid of the potholes etc but am no longer afraid. Haven't parallel parked yet though, that could be ouchey. I think both the 235/45-18 and 225/40-18 would be mistakes. Why not sell your rims and tires and get 235/45-17's. But I like the idea of parking next to a 2k2 Vette or Carerra and knowing my bad boys are bigger in front.

 

I've actually gotten use to the ride of the 40 profile. However I think I will have to have more frequent alignments performed with the Low profile of the tire. I try to avoid potholes as much as possible but when going 60+mph my steering whell vibrates like the alighnment isn't good. I bought lifetime rotation/balancing and alighnment from firestone for $180.00. I would definately like to know the affects of the low profile tires on my suspension though. I'll keep you posted.

I would definately go with a 45 series profile tire though if I could do things over again.

 

i just ordered a set of 18 in rims with 225/40/18 tires. hopefully the ride is not all that bad. i know the speedo's goin to be off and that most people have 235/40..but it was a package price deal. well see..

 

What type of tires are you going to be selling? How much?

 

Nitto NT555 235/40/18ZR 3days old and counting.

 

I wish I would have gotten 235/45/18. I have 225/40/18 now on my 18x7 wheels. I have already bent the front two on the inner lip when I ran over a crack in the road. I had to get them fixed. Probably due to the lack of sidewall. I did the calculations and my speedo would only be over by 1 mile if I had 45 series tires. I can deal with that for more security on the road. And a more comfortable ride.

At high speed, my car vibrates at the steering wheel like a bit**. I have had it aligned and had the wheels balanced. It helps some but it still doesn't get rid of it.

Get either the widest profile 18-inch tire you can get (235 or 245) or go with 45 series tires. Oh, and get 18x8! Nothing less.

My 2 cents.

 

http://www.geocities.com/jgadlage/tirecalc.html

Based on the link about it takes the Stock 17" wheel 25.86 inches to complete 1 rotation so the 225/45/18 tire would be the better choice: taking 25.97 inches to complete a rotation where as the 235/45/18 takes 26.32 inches. That is what i'm basing my decision on.

 

You should go with 235 or 245. 225 is too narrow! You WILL dent the sides of your wheels. Also the extra "bulge" will help protect the face of your wheels on curbs. Preferably 245. What calculator are you using.


Here, try this one

http://www.venommotorsports.com/howt...ldiameters.htm

 

Tire calculator

 

What is the stock offset My 18" wheels should have the same offset since i didn't request any special offset? I think I would go with the 235/45 18 instead but 245/45/18 sounds too bulky and might weigh too much.

 

U shouldn't have to specify that. It would be like telling Verizon you'd like touch-tone. The basic theory is that when you increase width via +1 or +2, you do not put 1/2 on the outside and 1/2 on the inside. You'd have problems if you did. More than 50'% would go on the outside, that's why you need the correct offset.

WTF is up with 45-series 18"? The only legit width I know of is 255 which is not suitable for the Max.

 

seems to be the most popular/effective combo here on the board. i had 225/40/18 and like that one guy said i was constantly screwing up my rims. 235s also have hella grip.

 

I think the 225-235/45/18's are too bulky looking.... Either way the common ratio is 225-235/40/18. The 45's are hard to find... Tirerack doesn't carry 225 or 235/45/18's in any brand.

Just go with the 235/40/18, it's not that much of a difference.

 

too bad i already ordered the 225/40..im screweeeeeddd in ny i think im gonna change over to at LEAST 235/40 next year..dont wanna ruin any of these rims dammit!! most people on the board either have or favor the 235/40/18 setup so i dont see why it can be so bad..

 

i recently got 235/40/18 wheels. the rim is 18x7.5, and i noticed that someone mentioned "noyhing less than 18x8" can someone please specify if i will have any problems with the 18x7.5's.


thanks

 

looks is the reason they say 18x8. you will be absolutly fine with 18x7.5. it just wont look as wide compared to a 18x8. unless your trying squeeze every bit of cornering ability out of your max you should be alright.

 

I'm pretty sure that on a 235/40-18 all mfg. specify a 8-9.5" rim, so 7.5 is out of that range. It is acceptable for a 225/40-18 though.

When I got my wheels aligned the guy looked over my car, and when I told him 235/40-18 on 18x8, he goes "you're lucky." I'm like how so? He said whoever sold me this package did it right. Most of the time people come in with plus 1 or plus 2 and they don't have the right size or rims. I was kinda skeptical but after reading these posts I realize the Tire Rack probably is very knowledgable and wont sell you the wrong setup. But it seems other places will. I'd say if the 225's are on the way, then just refuse them via UPS or FedEX. They may still charge you the shipping though. Pilot Sport A/S sizing

 

thanks a lot for the info guys. for a minute i thought i had wasted two grand for something that might easily get f*cked up.