 | Home > Wheels & Tyres > Fast motorway tyre pressures? |
 
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| ZeDefender Member Since: 15 Sep 2011 Location: Munich Posts: 4731   
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Quick straw pole...
Any suggestions about ST/Maxx 265 R16 tyre pressures for distance motorway driving in a 110? I'll be covering 1500km traveling 120-140 km/h. I usually run at 28/32 (unloaded) but I'm wondering if e.g. 35/40 would save rubber/fuel etc. with a "full house". Not sure about the "physics"... Cheers for any advice. Matt Tell someone you love them today because life is short. But shout it at them in German because life is also terrifying and confusing... |
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4th Jul 2013 2:34pm |
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| foxkilla Member Since: 01 May 2009 Location: J23 M1 Posts: 156  
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Personally I use 30/40 for high speed motorway driving even when towing.
27/38 normal use. |
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4th Jul 2013 3:23pm |
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| ZeDefender Member Since: 15 Sep 2011 Location: Munich Posts: 4731
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Cheers
 Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing... |
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4th Jul 2013 4:40pm |
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| BigWheels Member Since: 21 Mar 2010 Location: Somerset Posts: 1405 
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Very exact figures! Do you use digital or dial pressure gauges? Land Rover Defenders. 67 years heritage, minimal appearance changes, still going strong all over the world. Not a fashion vehicle, but fashionable to own. Made for the needy, not the greedy. Ta ta Defender
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5th Jul 2013 1:32pm |
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| Kraut Member Since: 28 Dec 2011 Location: Westphalia Posts: 336 
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I'm going on 2,1 bar front and 2,3 at the back with 265 summer tires, never change when loaded, just gets too bumpy and most of the defender tires have reinforced sides anyway, so had no problems yet.
Doing 25.000 km per year mostly on motorways/Autobahn with permanent speeds up to 150/160 kmh (depending on winddirection and slope  ). I haven't realized much tire wear yet, seems to be a good compromise between durability and comfort |
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5th Jul 2013 4:32pm |
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| ZeDefender Member Since: 15 Sep 2011 Location: Munich Posts: 4731
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Well, I learned a lot today. Somehow I started the journey (cold in Germany) at 4am with 35/40 psi and finished (very hot in Spain) with... 41/46
Cheers all and good point Jose 
Never realised the difference between cold/hot would be that big! I'll be letting some air out tomorrow morning - the good weather can do the rest Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing... |
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5th Jul 2013 8:56pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11240 
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Surely listed tyre pressures are for use when cold, which allows for heat build up after driving? The ambient temperature will be largely irrelevant - the temp difference you've noted will be down to the distance you've driven. 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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5th Jul 2013 9:04pm |
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| ZeDefender Member Since: 15 Sep 2011 Location: Munich Posts: 4731
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I recon I got the tyres up to nearly max temperature after a few hundred km...
I wonder what the "target" pressures should be? Could then work backwards  Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing... |
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5th Jul 2013 9:12pm |
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| tacr2man Member Since: 02 Oct 2008 Location: J10 M40 Posts: 20 |
Its abit long winded but you can work out what optimum tyre pressures for any given load by trial and error .
Take tyre pressure before journey. record pressure at end (that is if the journey is over about 10/20 miles) If the tyre pressure has increased by more that 6 psi then you started at Xpsi below the optimum that you are above the 6psi increase. If the tyre fails to reach the 6 psi then it was X psi above the optimum that you are below the 6 psi . HTSH |
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6th Jul 2013 8:23pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5745 
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I tend to run 36psi all round regardless of load. 235/85 16 BFG AT. 110 / td5 sw. 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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6th Jul 2013 9:05pm |
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| Arierep Member Since: 13 Apr 2013 Location: Portugal Posts: 258  
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In fact ambient temperature can change tyre pressure, but lets not go that way.
The problem is that I belive that people tend to forget that at highway speeds the tyres heat up a lot, and with that heat comes the extra pressure. Try to touch your tyres in various situations and you'll the notice the temperature variation. I once started a 100km motorway run (+-110km/h) with 2.15Bar, and ended with over 2.5Bar. At 2.5Bar the tyre is already getting a weird shape, imagine if I started with the high pressures some guys use. By the way, I measure with an ARB analogic gauge or a Schwalbe digital, depending on the situation. Both quite precise |
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7th Jul 2013 4:39pm |
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