Blippie
Well-Known Member
Land Rover advise 30psi all round. IIRC they did go down to 26psi for a while but that was a supposed fix for uneven tyre wear - tunred out to be transmission problems and nowt to do with tyre pressure - or at least that is how I understand it.
On the road tyres (Goodyear Wrangler 195/80R15) we use ours at 32psi. No real wear problems but the tyres do reach the minimum tread indicators in the middle third of the tyre first - but only by 0.5mm/1mm at most. I think the improved handling and fuel economy make up for that.
The off road tyres are BFG ATs and we run those at 36psi (i.e. vehcile manufacterer's recommended plus BFG's advice of an extra six). This leads to a firmer ride but no problems. Tyres were road legal for well over 80,000 miles.
Cheers
Blippie
On the road tyres (Goodyear Wrangler 195/80R15) we use ours at 32psi. No real wear problems but the tyres do reach the minimum tread indicators in the middle third of the tyre first - but only by 0.5mm/1mm at most. I think the improved handling and fuel economy make up for that.
The off road tyres are BFG ATs and we run those at 36psi (i.e. vehcile manufacterer's recommended plus BFG's advice of an extra six). This leads to a firmer ride but no problems. Tyres were road legal for well over 80,000 miles.
Cheers
Blippie
Dopey wrote a good method of checking tyre pressures with a piece of chalk and 100yds of road.
Dopey wrote a good method of checking tyre pressures with a piece of chalk and 100yds of road.
Quote:
Originally Posted by Dopey
Running pressure that is too high will give you a rougher ride and wear out the centre quicker. To determine the optimal tire pressure for a given tire and load, use the chalk line method as follows:
1) Fill the tires to some arbitrarily high pressure (38 psi is good),
2) draw a straight line across the tread of each of the tires (perpendicular to the sidewall),
3) drive in a straight line for ~ 100 feet,
4) examine the chalk lines.
If the line is gone only in the middle, the tire is overinflated. Reduce air pressure a couple of psi and try again.
If the line is gone only near the edges, the tire is underinflated. Add air and repeat process.
If the line is gone altogether, the inflation is good for the load in the vehicle. Write the numbers down for future reference.
__________________
Quote:
Originally Posted by Dopey
Running pressure that is too high will give you a rougher ride and wear out the centre quicker. To determine the optimal tire pressure for a given tire and load, use the chalk line method as follows:
1) Fill the tires to some arbitrarily high pressure (38 psi is good),
2) draw a straight line across the tread of each of the tires (perpendicular to the sidewall),
3) drive in a straight line for ~ 100 feet,
4) examine the chalk lines.
If the line is gone only in the middle, the tire is overinflated. Reduce air pressure a couple of psi and try again.
If the line is gone only near the edges, the tire is underinflated. Add air and repeat process.
If the line is gone altogether, the inflation is good for the load in the vehicle. Write the numbers down for future reference.
__________________
Universally_Challenged
Active Member
35-40 seems quite high
it all depends on the charictristics of a tyre. i used to run 45 psi on a set i had, they always looked soft and they lasted over 30,000 miles and got major abuse.
its all in the rigidity of the sidewalls,
next set i had had a rougher ride at 30psi, so dropped them to 26-28 just for the comfort, but they scrubbed out.
best ask your friendly tyre expert. i'm lucky enough to have known mine for 24 years so he always sorts me out.
