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Thread: 285 tyre's

  1. #11
    Join Date
    Oct 2009
    Location
    Sorrento Victoria
    Posts
    400
    never really understood why so many defender/110 owners choose to fit wider wheels/tyres when the stock standard 235/85 do the job fine both on/off road with better fuel mileage.

  2. #12
    Join Date
    Aug 2012
    Location
    Mackay
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    2,778
    Quote Originally Posted by mattmac View Post
    never really understood why so many defender/110 owners choose to fit wider wheels/tyres when the stock standard 235/85 do the job fine both on/off road with better fuel mileage.
    I agree somewhat, however I found 255/85 seemed to get just as good milage if not a bit better. That might be me... or maybe just my D90.

    '13 D90-TF A bar, APT steering guard/drag link/track rod, snorkel, Rijidij dual bar, cruise cntl,150hp Basremap.
    '75 S3 88-200tdi, R380/LT230, 33s, Paras, disco axles, 4.75HD R&P - Parting, PM me
    '89 FFR - ARN49-047 33's, P/S, leaky canvas, snorkel

  3. #13
    Join Date
    Mar 2018
    Location
    Tasmania
    Posts
    110
    Someone said that they thought the 285s can run on lower pressures than a 255.. I'm interested in this idea why would that be the case? Due to the taller side walls? I've actually felt more comfortable running lower pressures in thinner tyres thinking that due to their 'thinness' they would be less likely to come off! Maybe I have just been lucky.

  4. #14
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    13,933
    Quote Originally Posted by Landy Red View Post
    Someone said that they thought the 285s can run on lower pressures than a 255.. I'm interested in this idea why would that be the case? Due to the taller side walls? I've actually felt more comfortable running lower pressures in thinner tyres thinking that due to their 'thinness' they would be less likely to come off! Maybe I have just been lucky.
    All things considered, yes, the 285/75 should be able to run lower pressures.
    BTW, sidewall height is damned near identical in both sizes.
    A tyre is just a big air spring, the greater the volume (in theory) the lower the pressure needed for a given load.

    This doesn't take into account case construction which can require quite different pressures even in the same size.
    e.g. I needed to raise pressures by about 5psi on road when going from BFG MT's to Maxxis 762's in 255/85.
    The Maxxis was more compliant in the sidewall and so needed more pressure to 'stand up' in highway use.

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