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Old 09-19-2011, 12:14 PM   #21
PratoN
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Originally Posted by BetaDnB View Post
Just curious as to why nobody is going for the 16s. I find them to be a very happy medium between handling and ride comfort. There's also less rotational mass which = faster acceleration and better mileage (as minimal as it may be).
The 18" rims look so pretty... My winter tires will be 15s, however.
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Old 09-19-2011, 12:29 PM   #22
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The 18" rims look so pretty... My winter tires will be 15s, however.
I guess I'm a function over form kind of guy. I'll be doing 15" steels for winter as well. I don't want to ruin my alloys with salt and I live in pothole hell. It gets real bad in the winter here.
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Old 09-19-2011, 12:48 PM   #23
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Originally Posted by e350 coupe View Post
I think that people are mis-interpting what the size of tires actually are.

On the 18" wheel option the tire is a 235/40/18
235 is the tread width in mm
40 is the sidewall height percentage in relation to width
and 18 is the rim diameter in inches on which they are mounted

in this case width is 235 mm and sidewall height is 40% of the width, or 94mm
(3.70")

when we compare this to the 17" wheels which are 215/50/17
the tread width is now 215 mm (20mm less)
50 is the height of the sidewall as a percentage of width.
and the diameter is now 17"

for 17" oem, the sidewall height is 50% of 215mm or 107.5mm (4.23")

thus the difference, between 17" and 18" oem wheel package is 13.5mm or .531 of an inch.

this difference is about 1/2" in sidewall height which if you double it accounts for the difference between 17 and 18 inches.
I was just going to post that.. It is amazing how many people have no Idea what these #'s mean
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Old 09-19-2011, 12:54 PM   #24
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I was just going to post that.. It is amazing how many people have no Idea what these #'s mean
And if you go back and read my post a few after that the person you're quoting didn't exactly know either.
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Old 09-19-2011, 01:22 PM   #25
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Originally Posted by BetaDnB View Post
Incorrect. The first number of a tire size is known as the nominal width and is measured sidewall to sidewall, not tread width
Now we are talking semantics here as a properly inflated tire on a properly sized rim will have a 90 degree relation of the sidewall to the tread, thus the sidewall will be parallel to the outer edge of the tread and have the exact same measurement.

However over inflated tires will have a protruded sidewall and thus will have an exaggerated width which will not reflect the proper reference to the sidewall measurement. This same effect will also occur when a narrower rim is used for the same tire.




example 265/75R15
265=the tread width in mm
75=aspect ratio, or the sidewall is 75% as tall as the tire is wide
R15=radial tire and rim diameter is 15"

The bigger the 265 # the fatter the tire
The smaller the 75 # the lower profile it has
The 15 indicates the rim diameter
Source(s):Quoted from
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Old 09-19-2011, 01:53 PM   #26
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Originally Posted by e350 coupe View Post
Now we are talking semantics here as a properly inflated tire on a properly sized rim will have a 90 degree relation of the sidewall to the tread, thus the sidewall will be parallel to the outer edge of the tread and have the exact same measurement.
This is not true at all. Go look at your tires and tell me the sidewall is flush with the edge of the tread. You can't because they're not. The sidewall still sticks out past the tread by a good 1/2" to 1".

I may not be ASE or GM certified, but I spent a good amount of time working in tires as a tire tech specializing ONLY in tires. Everything else you said is correct, but the first number of the tire measurement is sidewall to sidewall. It's not an argument. It's a fact.
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Old 09-19-2011, 03:00 PM   #27
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The tires on a BMW Mini Cooper might be labeled: P195/55R16 85H

P — these tires are for a passenger vehicle. However 'P' denotes P metric size load & speed rating changes for P tire & non-P tires.
195 — the nominal width of the tire is approximately 195 mm at the widest point
55 — indicates that the height of the sidewall of the tire is 55% of the width (107 mm)
R — this is a radial tire
16 — this tire fits 16-inch-diameter (410 mm) wheels
85 — the load index, a maximum of 515 kg per tire in this case
H — the speed index, this means the maximum permitted speed, here 210 km/h (130 mph).


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Old 09-19-2011, 03:06 PM   #28
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so my 235/40/18s is just 235 mm at widest point, 40% of the side wall height to the 235 mm width and 18 inch rim.... All i care about is all four tires are inflated and got tread on them....lol
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Old 09-19-2011, 06:20 PM   #29
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Or you could try to avoid potholes and not hit them at high speeds? I live in Cleveland, which is *relentlessly* known for its potholes and constant construction (because of our harsh winters and hot summers the roads wear out quickly). I've never dented a rim from a pothole. Why? Because I slow down before making contact so that it doesn't do damage.

Either way, the tires that come with the 18" wheels on this car actually have quite a bit of sidewall and a large amount of overlap. You'd have to *really* hit a pothole to actually damage a wheel.
Well I miss about 90% of the pot holes my wife less. At night or when they are filled with water it's easy to say avoid them but the ones I hit I typically am not aware they are even there. And you don't need to being going any more than 15 mph when you drop a 215/50 tire into a 6" or more deep pot hole to bend a rim.

A 215/50 or a 235/40 tire has very little sidewall when compared to most cars on the road having a 60 or 65% aspect ratio in those sizes.
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Old 09-20-2011, 08:06 PM   #30
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I guess I'm a function over form kind of guy. I'll be doing 15" steels for winter as well. I don't want to ruin my alloys with salt and I live in pothole hell. It gets real bad in the winter here.
Yeah, you are in a rough area. My wife and I were going back and forth about the 18's or 17's. We are going with the 17's but the 17 polished alloy ones. I'm just not a fan of the sport alloy rims.

We ordered our Titanium Hatchback this evening. We hope to have it by the middle of November...
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