Vehicle & Technical > Discovery

Tyre pressure

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Tig:
What tyre pressure would you suggest for a Discovery running 235/85/16's please?

cardiff_gareth:
I run 245/70's which are 28 front and 36 rear but I'm gonna try them on 30 front and 38 rear  :wink:

glaggs:

--- Quote from: "cardiff_gareth" ---I run 245/70's which are 28 front and 36 rear but I'm gonna try them on 30 front and 38 rear  :wink:
--- End quote ---


Why?

If running bigger tyres then a lower pressure than std is usually best. Its air mass that supports the vehicle weight. The same mass of air in a larger space gives lower pressure. Having said that the type of use can mean a change of pressure ie constant high speed - increase slightly; larger load/weight - increase slightly. Higher pressure can give better mpg but taken too far will dangerously reduce grip. Having said that, 245/70's aren't significantly larger so std recommended pressure should be close to OK.

cardiff_gareth:
I ran them at lower pressures and they were nearly running on the side walls so they were increased  :wink:

Range Rover Blues:
Wider tyres will tend to look flat anyway, especially road biased ones that aren't as stiff.

I'd stick with the handbook settings for now.  Larger tyres tend not to like being inflated to the same pressure when fully loaded, the tread is more flexible and suffers from uneven wear.

But tyres work by the car hanging from the chords in the rubber, a bit like a spoked wheel, the pressure is secondary to that and not directly related to how much the car weighs.

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