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Old 08-20-2003, 09:18 PM   #1
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Tire Sizes

Okay. So. I have a set of 18x9s in the mail. Now I'm looking at two different tires... One is a 215/35ZR18, the other is a 225/40ZR18. Will either (both?) of these fit the rims? What is the difference between the two as far as looks go? I talked to some tire shops and they all said they would look "funny" and "low profile"... But that's sort of what I want. : Somebody help, please.
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Old 08-20-2003, 10:13 PM   #2
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Those tires aren't wide enough for a 9" rim at least I don't think they would be, I would say go with a least something like a 255 or 265/40 or maybe a 255-95/35or40/18
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Old 08-20-2003, 10:15 PM   #3
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I have 245/45/17s on my GT, that is the stock size, I am going to put 275/40/17s on the rear soon. My rims are only 8" wide.
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Old 08-20-2003, 10:22 PM   #4
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Well. I know almost nothing about tire sizes, but, I have 225/55/R16 on my 16x7.5 inch rims.. So these appear to be -smaller- than the ones I have now... But I don't know of any 18 inch rim that is less than 7.5" wide. : So why would they make 18" tires that won't fit the most popular width?
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Old 08-20-2003, 10:49 PM   #5
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Easy one, to fit rice cars man, Hondas, Mitsubishis, Nissans, Toyotas, etc. Focus for instance has an 18" rim available in a 7 or 7.5 inch width. :
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Old 08-20-2003, 11:00 PM   #6
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OK, take a ruler, and measure the tread width of those 225 tires you have, or just do it with the metrics. .35X225=78.75" better really if you convert it to inches, then you can double it and add 18 for the wheel height. I think you would find that your wheel height would be less than your 16 inch rims with your 255/60/16 tires. What you need to do is get as close to your stock total tire height as possible, that way you don't throw off gear ratio or speedometer/odometer.
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Old 08-20-2003, 11:16 PM   #7
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I don't mind if it throws off my speedo a little... What I'm primarily concerned with is: #1: If its "safe" to put either of those tire sizes on my rim. #2: That the tires don't look weird on the rim. Like, I saw a picture where a wider tire was used and it sort of bowed out. I only have found those two sizes... Which one would have better fitment and throw off the speedo less? It's raining so I don't want to go measure the tread.
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Old 08-20-2003, 11:34 PM   #8
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I really don't know, I would be afraid that a 225 with tire wouldn't seal right on a 9inch rim, other than that I guess it would be fine. IMHO it would definitely look weird though, just not wide enough for your rims. Go with at least a 245 or 255/40/18 for proper fit on that wide rim. Of the two sizes you mention a 225/40/18 is the taller and closer to stock tire height, but is still likely to be 1/2inch ot an inch shorter than stock.
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Old 08-20-2003, 11:41 PM   #9
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a 255/40/18 the tire height itself in mm is 114.75 that is actually half of it.

a 225/40/18 the tire height itself in mm is 90 mm, so from that you could see there would be almost 50mm difference in total tire height. Not good.
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Old 08-20-2003, 11:41 PM   #10
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I just found this really cool tool off google.

http://www.1010tires.com/tiresizecalculator.asp

It lets you enter the specs for two tires and it compare everything about them. According to this, the 225/40/ZR18 is only 2.8% difference in diameter than the 225/55/R16, and that's only a 1mph and +11 revolutions per mile difference. The 215/35/ZR18 is a 7.0% difference, which is 4mph. According to this the 225 is better, if any of them will actually fit on that wide of a rim.

edit: And it says that the 215/35 will only fit a 7"-8.5" wide rim. But that the 225/40 will fit on a 7.5"-9".
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Old 08-21-2003, 09:41 AM   #11
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Before I bought those tires, I would look at the specs on tire sizes of mustangs that come with 18 inch tires like the S281 Saleen and see what size they come with, I really think that size tire is going to look silly looking on your car, but if its what you want, go for it, in my opinion the 245/45/17 looks sort of small on my GT.
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Old 08-21-2003, 09:50 AM   #12
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I just checked for you. The saleen S 281 comes with the same size rims you have, the 18X9 five spoke saleens, they have Pirelli 255/35zr18 front tires and 265/35zr18rear tires, so that gives you sort of an idea how small 225/40 is going to look on your car.
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Old 08-21-2003, 09:52 AM   #13
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Ashentep has 305/35/18 Drag radials on the rear of his Cobra, they really don't look that big on there, the width does, but they fit right in his wheel wells perfect!
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Old 08-21-2003, 10:09 AM   #14
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Stop!!!! Please listen to Rick and do NOT buy anything less than a 245 for those 9" rims!!!! 225 is extremely too narrow for a 9" rim!!!! Not to mention it would look funy as hel as its a smaller tire overall than you would want on a Stang!!!

When you go from one wheel size to another you're doing what is called a "Plus 1" fitment. 1 for 1 wheel size. So, going from 16s to 18s is a Plus 2 fitment. A good rule of thumb in Plus sizing is to increase width and decrease aspect ratio. This offsets the gain in wheel diameter and keeps overall circumference nearly the same. a 245/40R18 is .1" larger than a 225/55R16. A 275/35R18 is .5". This isn't enough difference to matter.

Remember, the tires hieght is dependant on the width and aspect ratio. A 225/40 has a height that is 40% of 225mm. So its a really short sidewall and relatively narrow tire.

But in any case with a 9" width on the rim, I wouldn't go below 245mm in a tire's width. Good luck finding a shop to even attempt to mount them.

Go back to yout tire calculator and comapre using a 245/40, a 255/40 and a 275/35R18. All are less than 1 mph difference on the speedo, less than 1" diff in circumference. The 245/40 is almost a perfect replacement in terms of overall size.
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Old 08-21-2003, 10:48 AM   #15
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Thanks Sarge!
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Old 08-21-2003, 10:50 AM   #16
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no, prob, you'd pretty much already covered eveerything. I just couldn't resist saying something! Sold tires for too many years...
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Old 08-21-2003, 05:44 PM   #17
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275mm wide on a 9 wide AT least.
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Old 08-21-2003, 05:47 PM   #18
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Quote:
275mm wide on a 9 wide AT least

Nah, you can do 245's with no problem. wouldnt go smaller than that though
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Old 08-21-2003, 06:46 PM   #19
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Okay. I'm going to believe you guys that they won't fit. It just seems weird they only offer the 18" in sizes that are way too small to fit. Here are all the sizes:

245/55HR17
245/50HR17
245/45HR17
255/55HR17
255/50HR17
215/35ZR18
225/40/ZR18

They only make two 18" and they are all -smaller- than the 17" tires they make? : I just don't understand that.
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Old 08-21-2003, 09:57 PM   #20
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What on earth brand of tire have you been looking at man? Look at some Kuhmo Ecstas, BFG, Bridgestone, Michelin, There are lots of good brands, apparently the ones you are looking at aren't. Those 17 sizes are mostly wierd, and all HRs??? 245/45 is the only common 17 inch size I see, the others are all oddball sizes.
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Old 08-21-2003, 10:29 PM   #21
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Those -are- BFG. Scorcher T/A's though.
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Old 08-22-2003, 07:53 PM   #22
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I found a spec sheet for the tires. http://www.bfgoodrichtires.com/asset...corcher_ta.pdf

BFG says the 225/40ZR18 fits on a 7.5 to 9.0 inch rim and that the 215/35ZR18/RF fits on a 7.5 to 9.5 inch rim. Are these numbers incorrect? Why does the smaller tire fit on a larger rim? Why would BFG post unsafe numbers if it really doesn't fit? : I'm confused as hell.
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Old 08-22-2003, 08:02 PM   #23
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BF Goodrich never mean that size tire to be run on any Mustang, I will guarantee you that, they make plenty of tires that will fit a Mustang, in the correct sizes for a Mustang, just not that particular tire which apparently is mostly made for Hondas and other small Japanese Sports Coupes or sedans only.
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Old 08-22-2003, 08:07 PM   #24
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Does that mean it won't fit though? I know its a mostly sport compact tire... I saw them on one mustang, but it had 17s, so it obviously fit better. Sorry if I'm being persistant, but I kind of had these picked out before I even bought the new rims.
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Old 08-22-2003, 08:07 PM   #25
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If you want to make your Mustang look like Rice, then go ahead and put those silly looking undersized tires on it, if you want it to look good, get some 275/35/40/18s and forget the tiny little rice tires. I really think this thread has gone on too long already!
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Old 01-09-2004, 09:51 PM   #26
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reopened for future use.
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Old 01-10-2004, 01:22 AM   #27
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Right on. I love this thread. BTW: Instead of those tires I got 275/35/ZR18s mounted on 18x9" rims. They're sweet. Thanks to Rick for .. uh.. "helping" me choose.
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