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Thread: 265 75 16's v 235 85 16's

  1. 1st January 2013, 07:09 PM #11
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    benji
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    Wouldn't the lower revs at highway speeds lead to better fuel economy? The 4.6 could easily do 2000 at 100kph.

    Would you think Gippslander, that standard ratios would still be okay for the occasional jaunt up Butcher Country / Dingo hill etc? As I was planning to run a set of standard size road tires.
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  2. 1st January 2013, 08:35 PM #12
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    I was like you and thought the size difference would help but sadly it didn't i use a lot more fuel than before i realise the tyres drag more air as they are mud terrain and directional but all said and done i lost fuel economy. Yes you can do Butcher country and all the others the only problem is you use your brakes a hell of a lot more. Hope you enjoy the trip as i do every time i get away just expect to use more fuel and be careful on the steep down hills rest your brakes when you can.
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  3. 1st January 2013, 09:03 PM #13
    highrr
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    I have gone the 265 70 17, I have a Gen 3 in it so it has awesome low down grunt, it has 4.11s and lockers and big vent brakes so my only issue was the clearance, but the manual bypass kit allowed me to pump it up, so I am happy.
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  4. 2nd January 2013, 04:24 AM #14
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    Got 17's on ur Rangie eh highrr?

    Gippslander, are your figures based on the trip computer or measured kms versus pump litres? I have been getting better mileage in my P38 with the bigger tyres @ the pump.
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  5. 2nd January 2013, 08:30 AM #15
    highrr
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    Yeah got 17's on it, but don't like them, I bought 16's but the stud pattern was different so i am stuck with the 17's
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  6. 2nd January 2013, 11:47 AM #16
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    Fuel usage is based on trip computer and across reference to GPS haven't gone right into it but i do believe it is worse off than before.
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  7. 2nd January 2013, 07:23 PM #17
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    Unreal! My trip computer says I'm doing worse - naturally because I've gone from 94kmh at indicated 100, to 100kmh at 100 indicated. By the GPS and bowser I'm about a litre per hundred better off!
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  8. 3rd January 2013, 05:26 AM #18
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    According to my GPS i am doing 100 when speedo show 93 which is i would expect bigger tyres travel further per revolution and all. Fuel at best on flat highway shows 14.7 per 100 as compared to 11 per hundred before.
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  9. 3rd January 2013, 07:03 AM #19
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    Probably because your trip computer doesn't know you are actually travelling at 100 instead of 93!

    Ill let you know in a few years when I upgrade to larger tyres again.
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  10. 3rd January 2013, 07:30 AM #20
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    Gearing aside the higher profile tyre will always be better in sand. It's not width, but rather length of footprint and the shallower and less aggressive approach angle of the taller tyre to the sand. Picture the wedge build up. And effort to roll a log through sand - you don't want that. The taller tyre gives better protection to the rim. All the above applies rock hopping etc. I have experimented with fat v tall skinnier on my D2 which is far heavier than standard and does quite a lot of beach towing and tall skinnier wins even on the heavy vehicles.

    Cheers
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