Tyre pressures

[impulsive]

Hey guys,

Was just wondering what your thoughts on tyre pressures are. City & highway, tyre size you have and the benefits and disadvantages of each.

[sincy]

last time i checked my tyres were at about 36, but not long ago i got new rubber so probably should go check what tyre place filled them up to..

[sincy]

and should tyre pressure in my ute be different to a sedan?

[-scyth-]

VZ Wagon Riding on 235/45/17 Marangoni's.

I recommend riding on 38-40 psi even thou its hard as shit over speed bumps. I think you can understand some of the benefits of riding with more air in the tyres. (better tyre wear, better (maybe) fuel consumption) etc.

As for the utes, read your tyre placard & judge for yourself in terms of the load your constantly carrying is my advise.

[impulsive]

According to the placard on the drivers door
Sedans, under normal load
16" / 17"
Front and Rear 29 p.s.i.

i generally run upwards of 35" in my 245/35/R19's around town

[Escape-The-Fate]

i remember reading somewere if your car is running a tyre profile of 40 or less the minimum requirement is 36 psi..so 36-40 is good i guess.

[ashbox]

yeah i always run between 36 and 40psi, hwy i run 40

[thewheeldeal com au]

It's important to remember that your tyre placard will show a 'comfort' pressure...not necessarily the best pressure for tyre longevity.

Tyre pressures really are a personal thing, and it all depends on what your aim is out of them..
Longevity
Comfort
Load Carrying Capacity
Grip

As a general rule I recommend the following as a medium between these.
If your tyre profile is;
>=55 - 32psi
50 - 34psi
45 - 36psi
40 - 38psi
35 - 40psi
30 - 42psi

Utes & Vans - depending again on the tyre profile but I'd always use higher pressures in the back if you are always carrying a load. If you don't carry a load, then keep the pressures the same all around.

Long Trips - Usually run up to 5psi higher if taking a long trip so as to reduce rolling resistance and (theoretically) lower fuel consumption.

Rollin on dubs - Pressures have got to be high... you don't have any sidewall to play with in terms of shock absorption. Yes it will ride rough...thats the price you pay for big wheels.

Another easy way to tell if your pressures are too high/too low is to look at the tread wear, if it is wearing both outside edges of the tyre then the pressure is too low, if the inside is worn more than the outer edges then the pressure is too high.

Conclusion: Tyre pressures are up to you and what you want to achieve with your tyres.

[mdmatt]

20".. 245/30/20's... 40-43psi... running 42 at the moment

[satos]

According to the placard on the drivers door
Sedans, under normal load
16" / 17"
Front and Rear 29 p.s.i.

i generally run upwards of 35" in my 245/35/R19's around town

I ran them once at 29 p.s.i and the steering was very heavy.
Now I run them at 34 p.s.i all round with no problems.
I have got Bridgestones ER30 which is a 16 inch tyre and 60 profile.

[PaulSV6]

This reminds me, i better check mine.

I usually have the pressure at around 34-36. Tyres are 235/45 R17 94V.

[mars6484]

Just wondering, would you run slightly higher pressure on the front wheels as opposed to rear wheels because the car is front heavy?

[bigdaddycool]

u should have them fairly close to their rated pressure because otherwise they'll crack........ been around the block a few times to learn this.

I got 19's ....... recommended 50psi....... i run 42psi but long before that i used to run my older tires on like 37ish......... cause my car was slippery as **** in the wet and having them lower gave it more grip.

[satos]

Just wondering, would you run slightly higher pressure on the front wheels as opposed to rear wheels because the car is front heavy?

The only time I would run unequal tyre pressures would be to the rears if you are towing a heavy load.
Otherwise run them equal all way round you will have no problems.

[the_trademarc]

So hang on, I have BF Goodrich, 255/35 R18's, recommended pressure is 50 PSi.
Driving them at 50 PSi, is it dangerous? I know the ride is very firm, and I feel every bump, but Ive also done around 40k in them now and thread's still good...

[thewheeldeal com au]

So hang on, I have BF Goodrich, 255/35 R18's, recommended pressure is 50 PSi.
Driving them at 50 PSi, is it dangerous? I know the ride is very firm, and I feel every bump, but Ive also done around 40k in them now and thread's still good...

Who recommended 50psi? you sure that's not the tyres max pressure?

I would suggest 40psi for your 255/35R18's.

[-scyth-]

Who recommended 50psi? you sure that's not the tyres max pressure?

I would suggest 40psi for your 255/35R18's.

lol! bigfattytool (regular shit stirrer) posts a lot of unclaimed & ill relevant posts on here. So for him to recommend 50psi is one of many facts of shit...

[the_trademarc]

Mmmmm...well on the sidewall of the tyre it says max recommended pressure is 50PSi. I normally keep it at around 48PSi.
My question was, apart from the hard ride, its not going to be detrimental to my car's or tyre's health?

[thewheeldeal com au]

Mmmmm...well on the sidewall of the tyre it says max recommended pressure is 50PSi. I normally keep it at around 48PSi.
My question was, apart from the hard ride, its not going to be detrimental to my car's or tyre's health?

You'll probably find that you are wearing the inside of the tyre quicker than the outer edges but aside from that it should be fine albeit a rough ride.

[the_trademarc]

You'll probably find that you are wearing the inside of the tyre quicker than the outer edges but aside from that it should be fine albeit a rough ride.

Alright sweet, I'll keep an eye on the inside.
Thanks

[bigdaddycool]

lol! bigfattytool (regular shit stirrer) posts a lot of unclaimed & ill relevant posts on here. So for him to recommend 50psi is one of many facts of shit...

Lovely mate. My tires say 50psi........ guess what buddy..... if someone dyno's your car they pump them to the recommended pressure "if they know what their doing" due to the high speed.

So yes BUD I run my tyres around 42psi which are set to run 50 psi recommended if ur racing or towing loads.

Got a problem with that?.....

PS. Your tires do crack btw if u run them under a decent pressure "Mr I think I'm so imporant". Go ask a tire place..... oh but hey u dont have to, you think your it = "Your a Tool"

[impulsesv6]

in the 19's had - 40psi max
in the 17's i had - 36psi
in the 18's i have - 38-40psi.

more pressure the harder the ride...

id say minimum 34psi... max 42psi
any more than 42psi and youd be be overinflating and making your handling worse on a road tyre


50psi is just stupid, thats what we pump out burnout tyres to so they go big BANG!

[bigdaddycool]

depends on the tyre, brand and quality as to how high they are rated. but generally i think we'd all agree somewhere between 6-8 psi lower then rated capacity is probably about right.

[mmrdb]

in the 19's had - 40psi max
in the 17's i had - 36psi
in the 18's i have - 38-40psi.

more pressure the harder the ride...

id say minimum 34psi... max 42psi
any more than 42psi and youd be be overinflating and making your handling worse on a road tyre


50psi is just stupid, thats what we pump out burnout tyres to so they go big BANG!

Just for curiosity, are the pressures quoted above measured when the tyres are cold (ie. before car is driven) or when they are warm to hot (ie. driven after several km's)? EG. if the placard states 36psi, this is a cold measure, hence when checking at a servo (tyres have warmed up) the pressure would be @39-40psi due to the pressure increase from driving.

[satos]

The stated pressures on any tyre placard are for pumping the tyres up when they are cold.
If you pump them up when they are already warm or on a warm/hot day say to 34psi they will actually be around 36 psi.
You must compensate for the temp of the day.