 | Home > Wheels & Tyres > Tyre pressure help |
 
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8050   
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30/36f and 45/55r i would be looking at for economy but it will be hard off the tarnac!
For handling prob 10psi in rear more than what you normally run and i doubt you would notice difference Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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15th Jun 2023 8:02am |
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| Joe22 Member Since: 28 Apr 2023 Location: North West England Posts: 23 
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Cheers James. By 30/36f do you mean anywhere between 30-36 psi in the front??
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15th Jun 2023 8:18pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324 
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As an aside, 265/70 is a slightly odd size for a Defender. They're typically 235/85 or 265/75, which are the standard sizes and are as close to the same diameter as makes no odds. Yours are about an inch smaller in diameter and so your speedo will under over read slightly. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia Last edited by LandRoverAnorak on 30th Jun 2023 9:47am. Edited 1 time in total |
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16th Jun 2023 8:34pm |
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| Joe22 Member Since: 28 Apr 2023 Location: North West England Posts: 23
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Good to know! Do you think the previous owner just put the ‘wrong’ tyres on?
Other than the speedo issue should I be worried about anything else? |
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16th Jun 2023 8:47pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8050
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Yes Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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16th Jun 2023 9:09pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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I imagine they were cheaper than standard sized ones.
It's not the end of the world but might impact your MPG (more revs for a given speed) and your ground clearance is slightly reduced. On the plus side, it'll be slightly nippier off the mark due to the effective lower gearing. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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16th Jun 2023 9:10pm |
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| I Like Old Skool Member Since: 23 Feb 2015 Location: Manchester Posts: 814 
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Your MPG calculations will be meaningless because the reported miles from the speedo will be 'miles' out (see what I did there?
 ).
You are also highly unlikely to be prosecuted for speeding because your normally optimistic landrover speedo will now likely be reading crazy speeds (possibly only doing 23-24mph for an indicated 30mph). You really need to test your speedo against a GPS device or a timed known distance. You also need to check the mileometer by driving a known distance and seeing what the mileometer reports (at least 10 miles should help you get somewhere close to accurate). As far as tyre pressures go, I run my 110 at 30-32 psi all round (currently on 255/85R16 BFG MTs) and this seems to be the optimal balance between comfort, economy and even tyre wear. If I am towing or running heavier laden for a big distance then I will go to maybe 35Fr/40Rr just to firm things up but not sure the difference is really noticeable? |
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17th Jun 2023 10:46pm |
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| wyvern Member Since: 13 Dec 2009 Location: Cornwall Posts: 2117 
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to help aid your tyre pressure choice there is a little plate inside one of the front door pillars giving the recommended range of pressures - its also in the handbook.
I have a camper conversion so have a little more weight to carry all the time than most and with standard wheels and tyers run with 35psi front 50psi rear which is comfortable for my style of driving.  Poppy - TDCI (Puma) 110XS 2.2 - Camper conversion - see the build here - https://www.defender2.net/forum/topic56530.html
Elgar -TDCI(Puma) 110XS Dormobile - now sold Devon & Cornwall 4x4 Response - DC126  |
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18th Jun 2023 7:32am |
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| Penfold_6290 Member Since: 22 Sep 2021 Location: Dorset Posts: 320 
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Make of this what you will - your speedo will over read but not by much. You could look at fitting a Speedo Healer, which is pretty easy, or just drive in the knowledge that you have a safety margin for the indicated forward speed.
As has been stated - 235/85R16 and 265/75R16 are near enough identical https://tiresize.com/comparison/ Click image to enlarge |
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23rd Jun 2023 8:31pm |
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| Joe22 Member Since: 28 Apr 2023 Location: North West England Posts: 23
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Really useful, thanks all. I think I’ll end up buying the *correct* size tyres in the near future..
Good news is I made the 400 mile round trip without speeding  |
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29th Jun 2023 10:40pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17441 
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No, the speedo will over-read with smaller tyres. The speedometer will display a higher speed than that at which the vehicle is travelling, not a lower speed. |
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29th Jun 2023 10:49pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Yes, you're right - I got it the wrong way around. Original post edited for clarity. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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30th Jun 2023 9:46am |
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| Benland Member Since: 01 Nov 2023 Location: MONTELIER Posts: 4  
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Thank you Penfold_6290 for the link
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1st Nov 2023 1:01pm |
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