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View Poll Results: What diameter tires you are running on. (choose closest option)
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Bigger diameter
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5 |
17.86% |
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P235/75R15 Diameter = 733 mm = 28.85 inch
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1 |
3.57% |
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P225/55R17 Diameter = 679 mm = 26,73 inch
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1 |
3.57% |
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P215/60R16 Diameter = 664 mm = 26,14 inch
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3.57% |
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P195/60R15 Diameter = 615 mm = 24,21 inch
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4 |
14.29% |
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P185/65R14 Diameter = 596 mm = 23,46 inch
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7 |
25.00% |
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P145/80R14 Diameter = 587 mm = 23,11 inch
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10.71% |
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P175/70R13 Diameter = 575 mm = 22,64 inch
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4 |
14.29% |
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P155/70R13 Diameter = 547 mm = 21,54 inch
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1 |
3.57% |
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Smaller diameter
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1 |
3.57% |
09-11-2011, 05:14 PM
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#1 (permalink)
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Mechanical engineer
Join Date: Jan 2009
Location: Kitee (Finland)
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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  .
Last edited by Vekke; 09-11-2011 at 05:47 PM..
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 Today
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Other popular topics in this forum...
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09-11-2011, 05:23 PM
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#2 (permalink)
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Master EcoModder
Join Date: Nov 2010
Location: Atlanta
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25.5"
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This ain't a war, anymore than a war between men and maggots. Or, dragons and wolves. Or, men riding dragons, throwing wolves at maggots!
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09-11-2011, 05:26 PM
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#3 (permalink)
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Driving the TurboWeasel
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25" or so, the ones the came on the car OEM. 215/55-17.
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2012 Chevrolet Cruze Eco 6MT
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09-11-2011, 06:17 PM
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#4 (permalink)
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Pishtaco
Join Date: Jun 2009
Location: Bay Area, California
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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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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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09-11-2011, 06:35 PM
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#5 (permalink)
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...beats walking...
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...OEM on our 2011 Cruze LTZ is P225/45R18 on "flangeless" alloy rims.
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09-11-2011, 06:39 PM
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#6 (permalink)
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Pokémoderator
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Location: Southern California
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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.
CarloSW2
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09-11-2011, 07:20 PM
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#7 (permalink)
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Corporate imperialist
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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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1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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09-11-2011, 08:02 PM
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#8 (permalink)
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Master EcoModder
Join Date: Jul 2010
Location: Belgium
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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:
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Oh and the new very low rolling resistance nokian tire is not yet on the market
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It definitely needs testing then. 
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Strayed to the Dark Diesel Side
Last edited by euromodder; 09-11-2011 at 08:08 PM..
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09-11-2011, 09:10 PM
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#9 (permalink)
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EcoModding Lurker
Join Date: Sep 2011
Location: Canada
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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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09-11-2011, 11:04 PM
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#10 (permalink)
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Pishtaco
Join Date: Jun 2009
Location: Bay Area, California
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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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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
Last edited by SentraSE-R; 09-11-2011 at 11:24 PM..
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