Bluest wrote:

Chicken Drumstick wrote:

Bluest wrote:

I'm going to be the killjoy fun-police here, but I'd just caution against running pressures on the road substantially different than what the manual says. The factory pressures will have been chosen for a reason. Comfort is only one factor. Tyre life, handling, wet grip etc are all part of the mix. An issue introduced by running a different pressure may not become apparent until you have to make an emergency manoeuvre and could result in the car rolling rather than sliding, or under/oversteering when it shouldn't, aquaplaning/skidding more easily, heat build-up leading to tyre failure and so on.

I'm not saying you'll definitely die in a ball of fire and a couple of PSI here or there probably won't make any difference, but tyre pressures do play in important role in vehicle safety.

Cobblers. If it was a 'real' issue, there would be legislation around it. And there isn't.

Sure a flat tyre is still a flat tyre. But there is a huge array of usable pressures depending on use, surface, driving style and the actual tyres you are running.

I don't want to get into to an argument, obviously, you can set your pressures to whatever you want. But, as the drivers/owners we aren't in possession of the full facts as to why a given pressure is specified and where the threshold is for things to become dangerous when you deviate from that.

By way of an extreme example. A long time ago now, but there was a serious issue with tyre failures leading to rollovers in American Ford Explorer SUVs. Firestone argued that had the specified tyre pressure been 4 psi higher the tyre failures would not have occured.

As I said, I'm not stating a couple of PSI will be life or death, but I read of people running 110s at 8-10psi under the factory rear tyre pressure for reasons of comfort which for me is pushing it too far. My question is why did LR set it at 46psi or whatever it is? It isn't for heavy load/towing as there is an even higher pressure specified for that.

Once off-road, and speeds are much slower and grip with the surface is lower, go to town on lowering pressures.