Vehicle & Technical > Discovery
Tyre Pressure
Range Rover Blues:
It's down to weight distibution. The fully loaded front axle carries the same as an empty back axle, there is a massive difference in their loaded weights and if you look at the Disco side-on you'll realilse that the bulk of the body is balanced over the back axle, the engine sits behind the front axle, so the weight is not evenly distributed.
the key element in tyre pressures is that the tread is held evenly against the floor, giving best grip and performance. the height of the sidewall is incidental to that.
I think that tyres are a bit more comlicated than some of you realise :-.
glaggs:
The whole tyre/rubber technology thing is very complicated. Manufacturers have to give a best compromise pressure after testing which should work across a broad range of conditions. Calculating the presure for the new tyre is initially simple maths. I did have a link ti a 'chav' cruiser site that gave a siplish calc - they tend to go the other way - lower profile tyres which then need higher pressure. Will try and find the link and post here.
stuvy:
You guys are sooooo last year,
AIR IN THE TYRES??????
my mate owns a garage and stuck some NITROGEN in the tyres, hate the game not the player :cool:
Range Rover Blues:
Yeah, then we can all carry a bottle of nitrogen round with us when we go off-road :roll:
clbarclay:
--- Quote from: Range Rover Blues on March 11, 2008, 15:03:56 ---Yeah, then we can all carry a bottle of nitrogen round with us when we go off-road :roll:
--- End quote ---
I though we were all carrying one of them anyway for the air shocks :?
There was a rule of thumb posted on here a while ago (by thrasher IIRC) that was along the lines of drawing a chalk line across the read of the tyre*, then driving it for a few miles. The idea is to adjust the pressure so that the line is worn off evanly. If the chalk in the centre wares out first then reduce the pressure and if the shoulders ware out first then increase pressure. Then repeat the test untill you have evan ware. If you have uneven ware then thats probably your tracking or camber etc. thats incorectly adjusted and will need sorting out first.
*as conditions change so does optimum pressure, so best done in the same conditions that you want optimum grip, typical this is a dry day once the tyres have been driven a few miles first to warm them up.
I've also heard another technique involving checking temperaures of the tyres, though can't remeber that one too well.
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