Tyre Pressure

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Colin1

Colin1

New Member
Posts
88
Location
Bradford Yorkshire
I know this has been on before but i have just had fitted a set of new standard road tyres on 18 in rims.

The guy at the tyre place insists that i run them at 40 psi all round , why would he say that when the manual say 28 front and 38 rear i ask myself. My last tyres were run as per manual and i got cracks by the tread / side wall and he told me it was because a ran them at 28 / 38 saying that was two soft ? :confused:
 
Colin1 said:
The guy at the tyre place insists that i run them at 40 psi all round , why would he say that when the manual say 28 front and 38 rear i ask myself. My last tyres were run as per manual and i got cracks by the tread / side wall and he told me it was because a ran them at 28 / 38 saying that was two soft ? :confused:
Click to expand...

I agree with the tyre guy. I usually run them at max psi stated on the wheel, usually when I get new tyres fitted, they tend to leak a bit due to either the bead not getting a tight enough seal against the rim or that the alloy is slightly corroded, but pumping it to almost the max, you'll be sure your tyres won't get too soft while down the road for a while, especially when you plan a long journey.
 
Colin1 said:
I know this has been on before but i have just had fitted a set of new standard road tyres on 18 in rims.

The guy at the tyre place insists that i run them at 40 psi all round , why would he say that when the manual say 28 front and 38 rear i ask myself. My last tyres were run as per manual and i got cracks by the tread / side wall and he told me it was because a ran them at 28 / 38 saying that was two soft ? :confused:
Click to expand...

you got same tyres as original factory installed? Tyre guy is right;):D. To much side wall flex, just like bending a coat hanger, it soon breaks
 
Colin1 said:
I know this has been on before but i have just had fitted a set of new standard road tyres on 18 in rims.

The guy at the tyre place insists that i run them at 40 psi all round , why would he say that when the manual say 28 front and 38 rear i ask myself. My last tyres were run as per manual and i got cracks by the tread / side wall and he told me it was because a ran them at 28 / 38 saying that was two soft ? :confused:
Click to expand...

40psi! Way too high!
I run mine 28 front & 32 rear (unloaded). Gives the best ride & tyres still good after 20k.
Pretty sure most folk on here stick to recommended spec or lower on rears.
 
Last edited:
martynv8 said:
40psi! Way too high!
I run mine 28 front & 32 rear (unloaded). Gives the best ride & tyres still good after 20k.
Pretty sure most folk on here stick to recommended spec or lower on rears.
Click to expand...

+1 as above , your old boots were cracked due to old age or standing;)what was the date stamp on them? alarmingly I have recently seen a few of a certain premium brand tyre cracking through the tread & less than 12 months old:eek:
 
landygirl87 said:
I agree with the tyre guy. I usually run them at max psi stated on the wheel, usually when I get new tyres fitted, they tend to leak a bit due to either the bead not getting a tight enough seal against the rim or that the alloy is slightly corroded, but pumping it to almost the max, you'll be sure your tyres won't get too soft while down the road for a while, especially when you plan a long journey.
Click to expand...

:hysterically_laughisorry but you need to find a new tyre fitter;)
 
landygirl87 said:
I agree with the tyre guy. I usually run them at max psi stated on the wheel, usually when I get new tyres fitted, they tend to leak a bit due to either the bead not getting a tight enough seal against the rim or that the alloy is slightly corroded, but pumping it to almost the max, you'll be sure your tyres won't get too soft while down the road for a while, especially when you plan a long journey.
Click to expand...

Dear me that is terrible advice hope nobody takes notice of that.
 
Over inflated tyres may cause you insurance problems in the event of an accident.
With the Wranglers, I used to run 28 front and rear unloaded as directional stability was better, with the Nexens, I run 28 front 32 rear unloaded upping the rears to 38 when loaded.
 
What weight rating was on the tyre?

I run mine as per the manual (28/38) with no issues although I do wonder about dropping the pressure in the rear as most of the time there is not much weight in the back. No issues.
 
landygirl87 said:
I agree with the tyre guy. I usually run them at max psi stated on the wheel, usually when I get new tyres fitted, they tend to leak a bit due to either the bead not getting a tight enough seal against the rim or that the alloy is slightly corroded, but pumping it to almost the max, you'll be sure your tyres won't get too soft while down the road for a while, especially when you plan a long journey.
Click to expand...

Feck me!!, the max stated on my tyres is 65 psi. Terrible advice:rolleyes::confused:
 
Just to say, my tyre says the max is 44 psi. I tend to blow it up to 40, about 2 days later, they are down to 18, I would blow them to reccomend pressure, but I did forget to state I do a lot of heavy towing, but nothing will improve the tyre leakage.
 
landygirl87 said:
Just to say, my tyre says the max is 44 psi. I tend to blow it up to 40, about 2 days later, they are down to 18, I would blow them to reccomend pressure, but I did forget to state I do a lot of heavy towing, but nothing will improve the tyre leakage.
Click to expand...

You need the tyres dismounting and the rims and beads cleaned and tyres remounted.
 
landygirl87 said:
Just to say, my tyre says the max is 44 psi. I tend to blow it up to 40, about 2 days later, they are down to 18, I would blow them to reccomend pressure, but I did forget to state I do a lot of heavy towing, but nothing will improve the tyre leakage.
Click to expand...
Something wrong there then, pressure doesn't vary by more than a pound or two in a month on mine. Maybe the rims are porous, whatever, it sounds dangerous.
 
landygirl87 said:
Just to say, my tyre says the max is 44 psi. I tend to blow it up to 40, about 2 days later, they are down to 18, I would blow them to reccomend pressure, but I did forget to state I do a lot of heavy towing, but nothing will improve the tyre leakage.
Click to expand...

with all that pressure variation your tyre is now probably scrap as it must have sustained some sidewall/case damage,you need tyres removing/inspecting, rim cleaned/refurbished new valves etc etc,also get them filled with nitrogen;)
 
The max pressure that is written on the side of any tyre only applies to north America and Australia due to extreme cold and extreme heat it does not apply in this country.Any way i run my p38 at 32/36 with no problems and the tyres have been on for 4 years.
 
Hi there, not to worry i have set them at 30 F 38 R . Even i thought 40 for the front was two high but could not understand why the tyre place said 40 all round as they are not a back street place but a well respected tyre firm in Bradford, just thought i was missing something
 
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