Definitive CR-Z Tire Size List - Page 3 - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums
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post #21 of 85 (permalink) Old 04-11-2013, 09:23 AM
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Originally Posted by Shanghaidilly View Post
Very good thread, btw.

I have one question though. Doesn't the width of the wheel affect the overall diameter?

For instance, wouldn't a 205/45/17 on a 17"x7" wheel be a larger diameter than on a 17"x9" wheel?
Diameter is a 2 dimensional measurement, defined as the distance of a straight line reaching from edge to edge of a circle that passes through the center point of the circle. So the thickness of the wheel doesn't change the diameter.

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post #22 of 85 (permalink) Old 04-11-2013, 02:50 PM
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Originally Posted by Geopardy View Post
Diameter is a 2 dimensional measurement, defined as the distance of a straight line reaching from edge to edge of a circle that passes through the center point of the circle. So the thickness of the wheel doesn't change the diameter.
Uh, yeah, I know what diameter is.

But it would seem to me that if you stretch a tire on a wider wheel, the profile drops. And if the profile is in affect less, then so would the diameter. For instance, let's say you take the standard tire, 195/55/16, which is installed on a wheel that is 7" wide. If you put that same tire, on a 9" wide wheel, you have to stretch the tire, thus the profile is no longer 55mm and would be less. The same goes if you put it on a narrower tire, thus "bulging" the tire, and making the profile higher.

Is this not so?

Edit: This stemmed from Art's comment, when he said "The only thing is that the chart and calculator don't consider stretch."



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Last edited by Shanghaidilly; 04-11-2013 at 02:54 PM. Reason: Put Art's comment in here
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post #23 of 85 (permalink) Old 04-11-2013, 03:02 PM
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nice post!

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post #24 of 85 (permalink) Old 04-11-2013, 03:08 PM
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Originally Posted by Shanghaidilly View Post
Uh, yeah, I know what diameter is.

But it would seem to me that if you stretch a tire on a wider wheel, the profile drops. And if the profile is in affect less, then so would the diameter. For instance, let's say you take the standard tire, 195/55/16, which is installed on a wheel that is 7" wide. If you put that same tire, on a 9" wide wheel, you have to stretch the tire, thus the profile is no longer 55mm and would be less. The same goes if you put it on a narrower tire, thus "bulging" the tire, and making the profile higher.

Is this not so?

Edit: This stemmed from Art's comment, when he said "The only thing is that the chart and calculator don't consider stretch."
Nope, for wheels they are measuring the diameter of the wheel not the tire, which is why for OEM at least when they increase the wheel size the tire wall profile decreases to help maintain the amount of clearance between the tire and the wheel well. I think Art's comment refers to how some people alter how the wheel and tire are positioned to make them more flush with the car, rather than the recessed position most stock cars use.

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post #25 of 85 (permalink) Old 04-11-2013, 03:29 PM
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I thought stretch would make the diameter smaller too but I guess not according to this...



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post #26 of 85 (permalink) Old 04-11-2013, 03:59 PM
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Originally Posted by Geopardy View Post
Nope, for wheels they are measuring the diameter of the wheel not the tire, which is why for OEM at least when they increase the wheel size the tire wall profile decreases to help maintain the amount of clearance between the tire and the wheel well. I think Art's comment refers to how some people alter how the wheel and tire are positioned to make them more flush with the car, rather than the recessed position most stock cars use.
But I was talking about mounted tire diameter, not wheel diameter. Regardless, you sir, are correct. Here's what I found on TireRack - Tire Specs Explained: Rim Width Range for Street/Highway Tires

Quote:
The width of the rim will influence the width of the tire. A tire mounted on a narrow rim would be "narrower" than if the same size tire was mounted on a wide rim. NOTE: Because the overall diameter of a steel-belted radial is essentially determined by the steel belts, there is little, if any, change to the overall diameter of the tire due to differences in rim width.



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post #27 of 85 (permalink) Old 04-11-2013, 04:30 PM
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I'm really worried that my setup isn't going to work like I planned. I'm nervous!

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post #28 of 85 (permalink) Old 04-11-2013, 06:05 PM
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I'm really worried that my setup isn't going to work like I planned. I'm nervous!
How far out of specs are you?

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post #29 of 85 (permalink) Old 04-12-2013, 01:46 PM
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Not far out. The front will be fine 225/40/18 on 18x8 +35. The rear is what has me worried. 235/40/18 on 18x9 +40. Does anyone know if this will fill the fender wheel gap without me lowering it?

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post #30 of 85 (permalink) Old 04-24-2013, 04:20 PM
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Just to update my setup. They fit perfectly without any rubbing at all. I'm stock height at the moment. I think the 235/40/18 in the rear is a perfect fit on the 18x9 rim.

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