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  1. 7th January 2015, 11:07 PM #1
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    Tyre Question...Sort of...

    Hello Forumites,

    I have two sets of wheels/tyres for my D2.

    245/70-16 Bridgestone Dueller M/T's for play (about 2000km old) and 245/70-16 Silverstone/Goodyear A/T's for daily drive duties. Both sets on alloys.

    The A/T's are real close to needing replacement. Maybe a few '000 Km.
    I recently acquired two steels which eventually will hold the M/T's.

    In hindsight, I really wanted taller M/T's, maybe 265/75-16 but at the time I wanted the 'swap-ability' of being able to use a common spare so bought the 245's.. Next set of M/T's will be taller and fatter!

    Anyhoo, now it's time to buy new A/T's, I am thinking about going taller. Maybe 255/75, 265/70 or 265/75. I do have a 2" lift so no concerns there.
    Having read many of the numerous tyre threads, I am really starting to convince myself that going taller won't actually be much advantage on the bitumen as a daily. If anything, I need to offload the M/T's and go taller there. Having same size on all rims would make it easier and cheaper managing spares though...

    Anyone like to weigh in? Any thoughts?

    Cheers
    Ralph
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  2. 8th January 2015, 08:26 PM #2
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    loanrangie
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    Not sure if the D2 speedo is 5-6% over like a D1 but going up to 265/70 in AT's could correct that plus give a bit better cruisability with a larger rolling diameter.
    I went up in MT's and my at's are 245/70 which i havent used since as i prefer the larger tyres even for road use.
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  3. 8th January 2015, 09:25 PM #3
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    On my D2 I run 235 85 16 AT for my daily tyres with the standard alloys and when I want the harder stuff I use the 265 75 16 MT on P38 alloys. I just bought a second hand tyre for the spare, for each set. The 235 tyre I got for a 6 pack of beers off a member here. Its just nice to have an AT that's not noisy on road like the MT.
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  4. 8th January 2015, 09:26 PM #4
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    I forgot to mention with those size tyres your speedo will be out by about 8%.
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  5. 9th January 2015, 12:49 PM #5
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    Quote Originally Posted by SPROVER View Post
    I forgot to mention with those size tyres your speedo will be out by about 8%.
    Cheers,
    Will the speedo read 8% faster than ground speed or 8% slower than ground speed?
    I always get it confused.

    Cheers
    Ralph
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  6. 9th January 2015, 03:46 PM #6
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    That would be slower so at 100 on the speedo you will be doing 108 .
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  7. 9th January 2015, 06:07 PM #7
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    I recently put a set of 265/70 D697LT on the D2. Originally had 255/70 fitted. The 255 were 3.7% oversize and the 265 are 5.7% oversize. Using the GPS to get the tyre co-efficient setting on the nanocom right, so the road speed shown on the nanocom matched the GPS, I ended up using 4% and 6% respectively ...

    ... Therefore it's safe to say that with std tyres (235/70 or 255/65 or 255/18) the D2 speedo is spot on. What it says is what your doing if your running one of those 3 standard tyre sizes.

    Now, if I'm doing 100 on the speedo, the GPS & nanocom read 106km/hr.

    I think 245/70 is about 1.6% oversize.

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  8. 9th January 2015, 06:44 PM #8
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    Thanks,
    I'll be shopping around in the next few weeks for some new donuts. I suspect I'll probably go for 265/70 or 255/75 AT's then when I wear out the MT's, go tall with them as well.
    I have a nanocom, so interested in being able to 'correct' a lttle for tyre size.. mmmm, I'll have to look into it.


    Ralph
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