Tyre Pressures

[shredder667]

hey just wanna know what the best tyre pressures are for 235/45 17? cheers!

[mikel]

I run my tyres at about 35psi cold on the street and a bit softer on the track, about 35psi hot.

Some people have told me to run higher pressures on the track to reduce sidewall flex on a street tyre (and reduce the risk of peeling a tyre off the bead), but I found I lost a lot of traction running them around 39psi hot.

Read what the sidewall of the tyre says and stick close to that.

[nisskid]

waaay too broad of a question. need more details, such as tyre, intended use etc.

[(OO)SKYLINE(OO)]

Street, my front tyres are 34psi and rears 32psi

[Rekin]

DriverDynamics says best tyre pressure for all weather conditions is 38psi~

[r33cruiser]

lol at niskid.

people who say crap like that. appear to only want to increase their post count.

as a general rule. 35psi around is fine. however u should have been advised when they were fitted wat to run them at

[some_cs_student]

DriverDynamics says best tyre pressure for all weather conditions is 38psi~

Yes, and they were happy with that advice even on hotter days for normal street tyres.

Does anyone know if this advice also applies at the track? Should the tyres be softer?

I ran 38psi in the street tyres and got asked if I was running semi-slicks by an instructor so I didn't see a problem there

[Munkyb0y]

ive never heard of one pressure for all sizes before. i run 40 on my 18's

18's are 38-40

17's are 36-38

16's are 34-36

[siddr20]

It all depends on the type of rubber to be honest.

I normally run 32 all around. I find that the best for street use and track work.

Yes have used 235s/17s up front on TOYO t1rs on track and street and found 32psi to be the best for me.

Now i have used some cheap ass rubbers before, and have run 36psi and it handled like crap.. Dropped down to around 32 and it was a little better.

BUT still shit rubber..

anyways its just trail and error mate.

[shredder667]

thanks for the info guys! i will most probably run my tyres a some sort of medium between what everyone's saying. cheers.

[nisskid]

lol at niskid.

people who say crap like that. appear to only want to increase their post count.

as a general rule. 35psi around is fine. however u should have been advised when they were fitted wat to run them at

this coming from someone who has been on the site about 1/4 the time i have and has roughly the same post count. good call!

as u can see there are many differing opinions here, it doesnt necessarily mean some are wrong, they may just suit the different preferences and variables each car has.

what tyre it is, and what you intend on doing are just a few of the many factors that will dramatically vary the tyre pressure that's ideal.

[Sydneykid]

For normal road work, if I run more than 30 psi cold on Michelin Pilot Sports, I get centre of tread (over inflation) wear. If I run more than 26 psi cold for track work I get too high tread temperatures in the centres. If I run more than 18 psi in MT radials at the drags I lose traction.

Cheers

Gary

[Owgasm]

Hey,

Perfect timing.

I'm using Dunlop Formula W-10 265/35 18s all round.

Just for everyday street use.

What psi should i pump into the tyres?

Thanks

[Kinks]

For normal road work, if I run more than 30 psi cold on Michelin Pilot Sports, I get centre of tread (over inflation) wear.

Seems that different cars use their tyres differently. I ran 32psi F/R in mine (R33 w/ std rims) and got shoulder wear both inner and outer, so I've bumped it for a while to compensate. Then again, I'm no grandma on the street so I might be using my edges more

[Owgasm]

I think my tyres are in need of more air, so service station tomorrow.

What pressure should i put into the tyres above?

[H@ME]

I run 235/40 r18's and i run 38psi in back and 40 up front, general everyday street tires, i'd recommend this, possibly slightly less in the back if u drive hard or have high boost.

[Owgasm]

On my soarer its recommended on the sticker for 32psi.

I don't want to give too much or give too little.

I drive normally in the skyline on the streets, a bit of extra rpm here and there but nothing beyond that.

Normal street tyres.

Any straight answers for my details?

Type of tyres above, the way i drive aswell.

[Sydneykid]

Seems that different cars use their tyres differently. I ran 32psi F/R in mine (R33 w/ std rims) and got shoulder wear both inner and outer, so I've bumped it for a while to compensate. Then again, I'm no grandma on the street so I might be using my edges more

Could be too little caster.

Cheers

Gary

[Sydneykid]

I run 235/40 r18's and i run 38psi in back and 40 up front, general everyday street tires, i'd recommend this, possibly slightly less in the back if u drive hard or have high boost.

Shoot, how can you put up with the harshness from that sort of tyre pressure AND low profile tyres?

Cheers

Gary

[Sydneykid]

On my soarer its recommended on the sticker for 32psi.

I don't want to give too much or give too little.

I drive normally in the skyline on the streets, a bit of extra rpm here and there but nothing beyond that.

Normal street tyres.

Type of tyres above, the way i drive aswell.

Any straight answers for my details?

Nope. The best suggestion I can make is to pick a number, then check the tread wear regulalry and adjust accordingly.

Cheers

Gary