Tire fitment

[iBoost]

Sup all. Have a buddy with an extra set of tires in his garage that he told me i could have if they fit my stock wheels.
They're 215/35/18.
Will they fit, will it cause any issues? They're almost brand new, used a few miles maybe, and my stockies are almost as flat on the front as Britney Spear' head, so i could use some new ones.
Thanks.

 

[happy and angry]

They will fit on the rims relatively fine, but your overall tire diameter is going to be smaller by about 7%, which will screw up your speedometer and may also mess with your traction control/stability control. I'd shy away from that tire size.

 

[Mike240SX]

They'll fit. Keep in mind that your mileage is going to go down and your speedometer will read high.

 

[iBoost]

So... yes or no (flash)???

 

[happy and angry]

They will fit on the rims relatively fine, but your overall tire diameter is going to be smaller by about 7%, which will screw up your speedometer and may also mess with your traction control/stability control. I'd shy away from that tire size.

 

[iBoost]

dude, i'm not blind i got what you said, but if its like on my lexus where my speedo is off by ~2mph that doesnt really matter.. give me some numbers!!!! lol

 

[CnoTataymo]

They'll fit alright. You'll just be more prone to getting your wheels bent from potholes or sharp bumps in the road since the profile of the are way thinner then the stock size.

 

[iBoost]

They'll fit alright. You'll just be more prone to getting your wheels bent from potholes or sharp bumps in the road since the profile of the are way thinner then the stock size.

cool, thanks.

Anyone in here who actually runs this tire size? Any personal experience with this size?

 

[happy and angry]

Okay. Let me be more clear. It's actually a 9% reduction in total diameter, and as a result a 7% reduction in total diameter. You'll be off on the speedometer by about 7% (low). So when the speedometer reads 60 mph, you'll be doing ~56 mph.

Depending on how traction control/ABS figure out when to activate (IE: comparing speedometer to number of wheel revolutions per minute with the assumption of a given tire diameter) you may be putting yourself into a situation where these systems will not work properly. I do not recommend you do this.

 

[happy and angry]

It's actually a 9% reduction in total diameter, and as a result a 7% reduction in total circumference.

 

[Ghost Rider]

Just reset the ECU before switching tires and everything will be fine.

 

[happy and angry]

Explain how that addresses the problem, exactly?

 

[john blutarski]

Negatives:

1. Speedo reads low/gear ratios different
2. Rims get bent from running rubber band tires
3. Sidewalls too short making wheel gap look even worse than it does now
4. TCS/DSC ****** up

I'd pass on those...

 

[Ghost Rider]

Explain how that addresses the problem, exactly?

The ECU will relearn the cars new wheel diameter and correct itself.......

 

[CHIEFSMS3]

The ECU will relearn the cars new wheel diameter and correct itself.......

I think you are giving the ECU more credit than it deserves for being smart.

 

[happy and angry]

The ECU will relearn the cars new wheel diameter and correct itself.......

And, uh, just how exactly is it going to perform this magical feat?

 

[iBoost]

k, thanks guys. I guess I'll pass on them then.

 

[mordant80]

Ah come on.. free tires. dude, get them. That's not a major jump down in circumference. It's not going to affect TC/ABS much at all if any. The only thing you might notice is the speedo difference, maybe SLIGHTLY worse mpg. What would affect ABS, would be difference circumference tires installed on the car at the same time. (Even with that, there are tolerences, but it wouldn't take as much to screw something up) From H & A's posts and posts I've seen before he is a friggin specification nazi. (No offence, that's cool, it's a safe way to be) Don't worry about disconnecting the battery, the computer doesn't know what size tires you have and has no way of knowing. It just thinks you're goin a tit faster than what you actually are.

 

[happy and angry]

Not so much a specification nazi, really. I just want people to have all the information they need to make informed choices. I'm pretty anal about tires, though. Most important part of the car.

I wish I could find an article about potential problems with smaller circumference tires and the impact it might have on ABS/TC, etc. Anyone know of a good place to look? So far google has failed me.

 

[Ghost Rider]

Not so much a specification nazi, really. I just want people to have all the information they need to make informed choices. I'm pretty anal about tires, though. Most important part of the car.

I wish I could find an article about potential problems with smaller circumference tires and the impact it might have on ABS/TC, etc. Anyone know of a good place to look? So far google has failed me.

Google isn't the only thing that has failed you..