Appropriate tire pressure

[cupnoodle]

Hi guys,

Very quick question; I drive a DC5R with EP3R rims, tires are looking a little flat.

Do I pump them to the appropriate tire pressure for the DC5R or should i pump to suit the EP3R rims? Or is this totally irrelevant?

[dsp26]

got nothing to do with the car... depends what profile the tyres are

[jords]

Ill take a guess @ 28 PSI

[CRXDEL501]

what is the size of the tyres?

[EK1.6LCIV]

36-38?

[CRXDEL501]

36-38?

i think you might be on the right track.

i had that when i had low profiles on my first car.

[EK1.6LCIV]

I run 36-37 for daily use, did it in the hills on 37 was ok

still adjusting to the smaller width wheels lol

much better ride on the whole tho :)

[cupnoodle]

what is the size of the tyres?

I think it's 205/45/17?

Much appreciated guys

[chargeR]

Start at the pressures on the door jamb of your car, which should be around 32F/31R if I remember correctly. Increase in 1psi increments until you find a setting that works for you. Profit.


I think it's 205/45/17?

Much appreciated guys

Those tyres are too small for your car no wonder they look flat.

[LiL FiLo]

i run 40psi on 205/40/16, evens out the wear so it uses the inside on the tyre less than the outsidei drop it down to 35 if i feel like going for a drive with cornering

[dsp26]

i run 40psi on 205/40/16, evens out the wear so it uses the inside on the tyre less than the outsidei drop it down to 35 if i feel like going for a drive with cornering

tha'ts right though 40-42psi for 40 profile... thats why we're saying it depends on the tyre profile.

there is no stupid medium.. if you popped or damaged your tires prematurely you can't claim warranty if the pressures are wrong.

tire pressure is dependent on the profile (side wall height)






1a. Inflation Pressures for Low & Ultra-Low Profile Passenger Car Tyres
Low & ultra-low profile tyres ( i.e. tyres with profiles of 50 & lower) are becoming more common as aftermarket & original equipment fitments. Ultra-low profile tyres usually require higher inflation pressures than their taller profile equivalents. WHY? Ultra-low profile tyres have a smaller internal volume than equivalent size tyres with taller profiles. Therefore, the ultra-low profile sizes require higher inflation pressures to carry the same load.
A problem with low & ultra-low profile tyres is the fact that significant under-inflation is often not immediately apparent to the driver. Due to their stiff sidewalls, steering response is still sharp, even if the tyres are considerably under inflated. Therefore, tyres may be run for an extended period while under inflated. Extended periods of under inflation will cause irreparable tyre damage.



Circumferential sidewall cracking, as shown in diagram 1, is a common type of damage seen on ultra-low profile tyres due to under inflation. Crease marks which can be seen on the tyre's interior / shoulder area, such as in diagram 2, indicates that this tyre has been run while flat or with an extremely low inflation pressure. Most importantly, the external damage apparent on the tyres shown in diagrams 1 & 2 indicates that both of these tyres suffered internal damage to the carcass cords. Failure of the carcass cords due to this damage is likely to cause tyre failure, or what is often called a "blow-out". Therefore, for safety reasons, tyres with damage the same as or similar to those shown in diagrams 1 & 2 should be removed from service & scrapped.



The stupid general rule of 34psi that dodgy tire shops preach should be avoided