tyre pressure???? still look flat

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kj200sx

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302
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northampton
hi all done a search on here and following that have put 28 in the front and 38 in the rear of my 4.6 p38 but the tyre still look quite flat to me they are scorpion tyre do they just look like that or worth checking at another garage ???
 
What pressure gauge are you using? Most of the ones on garage forecourts are notoriously inaccurate. Best to invest a few quid in proper one and benefit from increased tyre life & better mpg. If you`re already using a good one are the tyres wearing evenly, or are the edges going off first? What size wheels `n` tyres are you running? !6" wheels with Scorpions will `look` flatter than 22" wheels running rubber bands!
 
ive been running 36psi all round for the last year my fronts are fine but both rears are heavly worn through the middle band with loads of tread on the sholders (too much pressure?)
 
It's always been a bone of contention with me as to why you're supposed to run 38psi in the rears all the time. 28psi in the fronts is fine but if you're running around with nothing or little in the back, surely a lot less than 38psi is more applicable? The same pressures for an empty vehicle and one with 5 people and luggage towing a caravan? What happened to the old system of empty and fully loaded pressures?
 
I'm on 16" scorpian's, 28 front, 33 rear, very even wear, good handling, no issues! Owners handbook and rave suggest 28/38..........never heard of anyone yet runnin those figures with even wear/handling. Tried the chalk test??
 
I run 28 - 38 for years, with no issues, as well on my 200tdi and my p38a the more air in the fronts harder the ride,remember its over 2 tons in metal, nick
 
Baloney999 said:
Okay, if no-one else is going to ask, I will; what's the chalk test?
Click to expand...


You put chalk on the tread and roll the vehicle back and forth a few times. If the chalk is rubbed off evenly across the tread the footprint is correct apparently. If the tyre is over inflated it should leave chalk on the outside edges, if under inflated it should leave chalk on the centre of the tread. Personally i would stick to manufacturers recommendations and change wheels diagonally every 6000 miles. Or front to back if you have directional tyres fitted. Front tyres will always wear quicker than rears because of steering action.
 
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