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Discussion Starter #1
Hi all. Just a heads up that I'm not a hardcore car enthusiast, but learning.

Anyway, recently, after years of waiting, saving, and more waiting I went and bought some used 17" RTX rims and tires.

Fast forward a couple of months in and I go over a bad pothole/construction section, car starts vibrating...turns out 2 of my rims were bent...they're garbage 馃槥

So I go back searching and find these used and cheap OEM Nissan 18" rims, which I don't know how offensive this is to everyone, but I thought they looked nice and the bolt pattern and center bore works. However, the tires are 245/45/18 and tire guy takes a quick look and says they won't fit 馃槥

Was told that 215/40/18 would work.

I guess my question is, can anyone confirm that my current tires won't work? I believe it, but hoping for that 1% chance it's not. And any advice for what tire size works best before I go and make another mistake? Looking online the suggestion I got seems good. I have a 2013 coupe lx btw.

Thanks!
 

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We are missing information here, such as how wide is your wheel from bead to bead. Which model and trim level of Nissan are your 18s from?

245s are generally quite wide for a stock Japanese wheel. Civic SIs are 225s. LX/EXs are 205s.

One size up is generally considered the safe and/or workable limit. My LX now has 215s, and they work well and look good. Speedometer accuracy is perfect, if the speed cameras in the school zones are any indication.

The 40 or 45 measurement is the sidewall height, but that number works as an aspect ratio with the larger first number (215, for example), meaning, the ratio of sidewall height to width (in mm).

Not all tires with the same designation are the exactly the same, either. 215/55-16 for example, will not be exactly the same diameter and/or width from brand to brand or model to model, although the last number, the wheel diameter, will be the same. All tires with a last number of 16, for example, will fit on any 16 inch wheel, assuming that the other numbers work for that wheel, in that the tire is not too wide (245 in your case) or narrow.
 

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225/40R18 should work. 215/40R18 would as well, but there aren't many options in that size.
 

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Yes, if I had an Si, I wouldn't go smaller, though. Stock is 225, as mentioned above.
 

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Depends on the year. My 2013 came factory with 215/40R17 but modrids came with 225/40R18s
Yes, I was thinking of my year because the OP said be bought 18s, although his car came with 17s.

Now you know why I often ask so many questions. haha
 

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Depends on the year. My 2013 came factory with 215/40R17 but modrids came with 225/40R18s
215/45/17 on the '12-'13

As for the OP's question, those tires are way too big, almost 2" taller than stock. The Speedo will be way off and the car will accelerate slower. Swap them for a proper size

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215/45/17 on the '12-'13

As for the OP's question, those tires are way too big, almost 2" taller than stock. The Speedo will be way off and the car will accelerate slower. Swap them for a proper size

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Yea thats what i meant
 

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Discussion Starter #10
Sorry for the slow reply, but thank you all for the different insights. Not sure if it matters anymore, but for more info, the rims are off a 2010 nissan maxima. So based on online:
8Jx18 ET50
5x114.3
66.1 center bore

My civic stock is
6Jx15 ET45
5x114.3
64.1 center bore
195/65R15

Based on all the replies I'm thinking of sticking with what was suggested of
215/40/18 new tires.

Thanks again!
 

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If the center bore of a wheel is bigger than the hub it's going on, all the weight of the car will be carried by the wheel studs. Not sure if that's gonna be an issue, but it's something to be aware of.
 

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Discussion Starter #12
If the center bore of a wheel is bigger than the hub it's going on, all the weight of the car will be carried by the wheel studs. Not sure if that's gonna be an issue, but it's something to be aware of.
Ya I asked the tire guy I go to about this and he said if there's vibration then it's an issue, otherwise it's fine. Though to be safe he recommended I get hub centric rings, so that's the plan.
 
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