LR90 Posted January 21, 2006 Share Posted January 21, 2006 Found an easy way to lift the 90 Put air in the tyres Was pulling to the left a bit and low speed steering was heavy so I though it was about time to check the pressures. NSF was down to 8psi. But with all the recent talk of rolling radius and tyre sizes I thought I'd do some measuring as I inflated. At 8psi the hub centre was 15" from the ground At 14psi - 16" and at my preffered 18psi it is back up to 16.5" (so 33" effective diam on a 35" tyre) Note BFG give the effective diam of their 35x12.5 MT as 33.7" Rears where prob ok at 12 but I've brought them up to 15psi and the rear hubs now sit at 17.5" off the ground which tends to indicate 15psi is a bit on the high side for the rear. Think I'll get my anorak now. Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted January 22, 2006 Share Posted January 22, 2006 So am I totally OTT running 32psi in my 235/85 TracEdges on 100% road use? Quote Link to comment Share on other sites More sharing options...
LR90 Posted January 22, 2006 Author Share Posted January 22, 2006 Maybe. What's their max load and what load are you subjecting them to? Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted January 22, 2006 Share Posted January 22, 2006 Max load 1380kg per tyre, the Ninety weighs 1600kg(?) ish - so less than a quarter of their rated load each. Quote Link to comment Share on other sites More sharing options...
bishbosh Posted January 22, 2006 Share Posted January 22, 2006 Not wanting to teach any body's Grandmother to suck eggs, but you need to be extremely careful running tyres on the road at low pressures. The excessive sidewall flex causes the tyre to overheat and in the worst scenario - explode with disastrous consequences. Contrary to popular belief, under inflating is far more dangerous than over inflating, not that I'd advocate either for road use though. As I said, not saying anyone here is doing anything wrong, I just felt it should be said so anyone experimenting with tyre pressures knows the pitfalls. Quote Link to comment Share on other sites More sharing options...
LR90 Posted January 22, 2006 Author Share Posted January 22, 2006 Too true. Must admit even now after a long (200+ mile) Mway trip I'll still feel the sidewall temp (cooler than my Disco's) just for reassurance and I also keep a close eye on tyre wear patterns which is now much improved. TC, if your 90 weighs 1600kg your a lucky man. Quote Link to comment Share on other sites More sharing options...
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