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View Poll Results: What diameter tires you are running on. (choose closest option)
Bigger diameter 5 17.86%
P235/75R15 Diameter = 733 mm = 28.85 inch 1 3.57%
P225/55R17 Diameter = 679 mm = 26,73 inch 1 3.57%
P215/60R16 Diameter = 664 mm = 26,14 inch 1 3.57%
P195/60R15 Diameter = 615 mm = 24,21 inch 4 14.29%
P185/65R14 Diameter = 596 mm = 23,46 inch 7 25.00%
P145/80R14 Diameter = 587 mm = 23,11 inch 3 10.71%
P175/70R13 Diameter = 575 mm = 22,64 inch 4 14.29%
P155/70R13 Diameter = 547 mm = 21,54 inch 1 3.57%
Smaller diameter 1 3.57%
Voters: 28. You may not vote on this poll

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Old 09-11-2011, 04:14 PM   #1 (permalink)
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What diameter tires are you using at the moment?

I need some back up data on ecomodders tires when I will go to nokiantyres to talk about some special purpose tires which I will need on my Lupo 3L. I suggest that they would make about 5 different sizes with about 8% diameter steps :/.

You can legally change the diameter of tire 5% to each direction in EU, is it the same in the states?

Oh and the new very low rolling resistance nokian tire is not yet on the market .

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Last edited by Vekke; 09-11-2011 at 04:47 PM..
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Old 09-11-2011, 04:23 PM   #2 (permalink)
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25.5"
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Old 09-11-2011, 04:26 PM   #3 (permalink)
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25" or so, the ones the came on the car OEM. 215/55-17.
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Old 09-11-2011, 05:17 PM   #4 (permalink)
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25.07" (P205/50-R17). OEM were P185/60-R15, 23.7" diameter. New tires are 5.31% taller. US mfrs don't recommend going above 3% taller.
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Old 09-11-2011, 05:35 PM   #5 (permalink)
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...OEM on our 2011 Cruze LTZ is P225/45R18 on "flangeless" alloy rims.
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Old 09-11-2011, 05:39 PM   #6 (permalink)
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Vekke -

195/65 15, one size up from stock, about 2+% larger diameter and 1 lb heavier than stock. I don't know of a specific law in the USA that prohibits tire size change. It's more a physical thing of fitting in the wheelwell. I could have fit two-sizes up from stock for a 4% larger diameter, but the tire jumped to 3+ lbs heavier.

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Old 09-11-2011, 06:20 PM   #7 (permalink)
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In the US we can do pretty much what ever we want with tire size as long as it with in reason.
On my car I run P225/60R16.
Taller and narrower that the dead (245/45) 16 inch OEM size my car came with.

On the truck I use 31x10.5R15. That is between 2 to 3 inches taller a little wider than what it left the factory with. I went taller for less rotations per mile and wider for the load rating.
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Old 09-11-2011, 07:02 PM   #8 (permalink)
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I'm running the very popular 205/55/16 24.87 in 631.69 mm diameter
Can't do a range of tyres in Europe without this size.
(As an OEM alternative to the stock 195/65/15 24.98 in 634.49 mm.)

In Belgium, we're limited to - 2 % and + 1,5 % differences in tire diameter.


Quote:
Oh and the new very low rolling resistance nokian tire is not yet on the market
It definitely needs testing then.
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Old 09-11-2011, 08:10 PM   #9 (permalink)
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Dumb question everyone,
has anyone noted a significant gain in MPG's due to lower cruising RPM's with bigger wheels, in spite of possible losses in aerodynamics and gains in weight?
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Old 09-11-2011, 10:04 PM   #10 (permalink)
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Yes. Tall tire test. Note page 1 of that thread shows the heavier, less aerodynamic wheels/tires don't give significantly worse performance than the OEM stockers.

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Last edited by SentraSE-R; 09-11-2011 at 10:24 PM..
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