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I just called Yokohama directly, and they told me I should put 50psi of pressure in my tires, yokohama parada spec-2 215/35/18? Does that make any sense what-so-ever? How much should I put?!?!

 
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what.. doesnt sound right.. i have like 35 in my 215-40-18 and even then things are pretty stiff. it also depends on cars weight... did you tell them it was a civic and not a bmw?

 
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You should call them back and ask someone else. You almost never put more than 35 in a passenger car especially a civic. It is recommended by honda that you put 35 psi no matter what tire size.

 
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I agree, I have 35 in my 215/35-18's. I would'nt go much more than stock psi.

 
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Who at Honda told you to put 35 PSI in the stock tires? Read the manual, it says 30 PSI. Then I think theres some rule that you add 2 or so pounds for every inch larger the rim gets. So stuffing 35-36 PSI in an 18 sounds right.

 
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uh oh.. i put in 35psi in my stock rubber.. but in the winter, i put in 35, but would be around 38 in the summer (colder than poo here)

 
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I run 35 on my stock wheels. Everybody I know with 18s run around 30 unless their racing.

 
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50psi I don't think so. I run my 17's at 32psi except at the track when I drop it down a tad.

 
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I work at Discount Tire. We usually put 35 in all passenger tires. I had a set of 215/35/18 Paradas on a set of Enkei CDR9s, and I cannot imagine how hard the ride would have been if I put the max in them. I would reccomend 30-35, any more than that and it's going to ride like a rock. Yokohamas crazy I guess!

Peace

 
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I would not put 50psi. You should put 35 to 40 max.

 
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they probably meant thats the max you could put. cause i think the max on mine is 52 or something

 
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That's what I thought they were talking about at first, but the girl told me it was because these tires couldn't handle the weight of my car, so therefore I would have to fill it to the max. I was like if it can't handle the weight of a civic, then what car did they design these tires for?!?! [IMG]i/expressions/face-icon-small-confused.gif[/IMG]

I think I'll give them a call back tomorrow and try to talk someone else...

 
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ive got 18's as well and at first i thought i should put less since its a bigger rim like 25 or so, then it was wearing really weird so now i have 36 and they run just as smooth and dont wear funny anymore.

riley

 
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When I had 17" rims, I needed to fill up to the max psi (44 psi) to support the weight of my Civic. You guys who are running 17's and 18's with low profile tires and filling them up to 30 (!) or 35 psi are taking a real big risk of bending and damaging your rims, not to mention lower gas mileage (underinflated tires = greater rolling resistance) and genuine safety concerns.

Think about it - with the stock Firestones, you need about 30-32 psi to properly support the weight of the car. Now you're switching to a low pro tire that has considerably less volume than the stock Firestones. Simple common sense will tell you that you need to fill up your tires to a much higher pressure to compensate for the lower available volume.

Of course, you ride is going to be a bit stiffer, and in some cases it may ride like total ****. But what do you expect if you upgrade to a ridiculous wheel size like 18" on a Civic?

Do yourself a favor - and call up the tire manufacturer and ask them what psi you should inflate to. You can calculate this stuff yourself (using the stock and current dimensions of the tire and your vehicle weight), but it's a lot easier just to call them up.

 
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htown from all the peeps i know with 18's and thier all running 35-37 and there fine and when i get 19's i'll be running 37 i think 40 is way to high. with my 17's i ran 29 in front and 26 in back and i hit a speed bump at 80 one time and nothin happened. also with higher inflation if you run over nail etc its more likey to punture tire than to just roll over it.

riley

 
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The only way to be absolutely sure your rims are ok is to put it on a balancing machine. When I had 17" rims and 205/40/17 tires, I had my tires balanced one time and the guy at Discount Tires was like, "we can't balance your tire because the rim is bent..." I looked over at the tire/wheel on the machine and sure enough, you could tell it was wobbling while it was spinning around.

So moral of the story is - it's impossible to know for sure if your rims are ok just by looking at it and riding around on it. Underinflated tires greatly increase the risk of damage to your rims. My 17" rims were heavy as hell (25 lbs. each) and I still ended up bending them, which got me pretty upset. Now I'm not saying that everyone who runs low pro tires is guaranteed to mess up their rims, but it happened to me. And now I say screw it with huge rims and skinny tires - I switched to lightweight 16's and fat 215/50/16 tires. My current tire volume is actually MORE than the stock Firestones (because they're so much wider), so I can actually get away with inflating it to about 27 or 28 psi.