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Home > General > Does larger wheels mean better MPG.? |
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The Road Toad Member Since: 02 Mar 2010 Location: Warwickshire Posts: 280 |
Am I right in thinking that larger diameter wheels mean more miles to the gallon.
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18th Mar 2012 8:32 pm |
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taztastic Member Since: 03 Feb 2011 Location: North West Posts: 8652 |
No.
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18th Mar 2012 8:35 pm |
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RazMan Member Since: 18 Nov 2011 Location: Essexshire Posts: 336 |
Theoretically a larger diameter wheel would give you more mpg - like selecting a higher gear. However, if you are reducing the tyre profile height to compensate for the larger diameter, the only thing you will change is ride quality - the larger the diameter gets, the worse the ride quality gets...... fashion hurts sometimes doesn't it Cheers,
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18th Mar 2012 9:51 pm |
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Tigger Member Since: 30 Mar 2011 Location: L15KRD Posts: 2555 |
It's not quite that easy. The gearing is already very high; take it higher still and the engine simply won't be able to pull it effectively and you'll start to slow down. You'll either then press the accelerator harder, or change down a gear and use more fuel that way instead. Gearing has an optimum level for economy and the gearing on the Freelander is about right as standard. |
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18th Mar 2012 10:15 pm |
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mikehzz Member Since: 04 Sep 2009 Location: Springwood Posts: 749 |
Larger tyres trick the car computer into thinking it hasn't gone as far as it has. The wheel does less revolutions to go the same distance and the car computer gets its distance from the number of revolutions. Therefore, mpg will go down on the computer but will really be about the same in actuality. The diameter of the wheels has little bearing because as stated above, the circumference of the tyre is about the same on standard 17's and 19's. The extra wheel size is compensated by less rubber by approximately the same amount. If you replace the standard 235/65/17 with 245/65/17 then the tyre diameter increases by about 15mm. The speedo starts to read about 3% slower and fuel economy according to the trip computer will increase by about 3% but its not real. What is real is you start to run out of puff going up hills because it affects gearing the larger the tyre diameter. |
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19th Mar 2012 12:12 pm |
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mikehzz Member Since: 04 Sep 2009 Location: Springwood Posts: 749 |
There are other effects. You wear brakes out quicker and risk damage to diffs and axles due to the higher torque pressure of the bigger diameter. There is a benefit where you get more warranty because the odometer is reading lower. I have checked this on mine with 245/65/17 tyres measured against the 5km odometer check areas of our motorways. My odometer reads short by over 3% at around 4.8km. |
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19th Mar 2012 12:25 pm |
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garioch43 Member Since: 24 Feb 2012 Location: Aberdeen Posts: 158 |
You could find that your warranty is invalid because of the non-standard wheel/tyre combination. garioch43
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19th Mar 2012 2:16 pm |
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Mona Geeza Member Since: 22 May 2010 Location: Devon Posts: 1293 |
If you put tractor tyres on then it would. |
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19th Mar 2012 3:38 pm |
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Hicksy Member Since: 29 Apr 2011 Location: Nr Oxford Posts: 355 |
Mines got 19's on and been out in td4s with auto and 16 inch wheels and mine is the worst out of the two on fuel |
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19th Mar 2012 8:17 pm |
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mikehzz Member Since: 04 Sep 2009 Location: Springwood Posts: 749 |
What size tyres are on yours and what size are on theirs? You can do a comparison of the diameters and circumference pretty easily online. From memory, the overall size of 19's is 5-7mm larger than 17's with standard tyres, probably more for 16's. Therefore your speedo will be reading slightly slower than theirs. It also comes down to how much air is in the tyres. |
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19th Mar 2012 9:10 pm |
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RazMan Member Since: 18 Nov 2011 Location: Essexshire Posts: 336 |
This might help....
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20th Mar 2012 12:19 am |
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AndyC Member Since: 30 Nov 2007 Location: Where the snow dosen't melt when the sun is shining! Posts: 4165 |
MPG is also dependent on tyre type (not size as earlier mentioned). Using winter tyres for example will result in less MPG than summer tyres in the same driving conditions. 2007 Freelander 2 HSE TD4 Manual with Premium Pack & Moonroof.
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20th Mar 2012 7:42 am |
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Gecko Member Since: 04 Feb 2008 Location: St Pauls square Posts: 157 |
Not in the snow it won't |
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23rd Mar 2012 6:13 pm |
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Dave Member Since: 04 Jul 2007 Location: Somewhere Near You Posts: 2666 |
Gecko,
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23rd Mar 2012 8:30 pm |
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