Michelin PS4

[blackestvoid]

switched over to this tyre for about 6 months
215/45/r17 profile same as previous set but different brand
noticed all 4 tyres will lose about 5-10 kpa every month or so at the same petrol tyre pressure pump, is this normal?
previous brand tyres no such big loss of pressure within such short duration of a month

pumping at 240 kpa but seems like the entire tyre surface is making contact with the road, safe to increase more to 250 or 260 kpa?
if driving alone, want to see 0.5-1cm side of the tyre surface not touching the road, so if fetching 4 bbfa then just nice the entire tyre surface will come into contact with the road

 

[sinistral]

You meant kPa right? 5-10 kPa loss is normal. PSI is on a different scale.

 

[IcYFl4mEz]

1 month the most lose 1-2PSI ... if you lose 5-10PSI its something wrong, unless you meant kPa.
what pressure to pump is ultimately up to you, try diff kind of pressure till you feel comfortable. usually is the recommend pressure + 1-6 PSI .

 

[EJB]

switched over to this tyre for about 6 months
215/45/r17 profile same as previous set but different brand
noticed all 4 tyres will lose about 5-10 PSI every month or so at the same petrol tyre pressure pump, is this normal?
previous brand tyres no such big loss of pressure within such short duration of a month

pumping at 240 PSI but seems like the entire tyre surface is making contact with the road, safe to increase more to 250 or 260 PSI?
if driving alone, want to see 0.5-1cm side of the tyre surface not touching the road, so if fetching 4 bbfa then just nice the entire tyre surface will come into contact with the road

Was on 225/45/R17 for 5 years. Yes, the kPa loss with nitro or not, is normal, Anyway I always do a monthly check in the early hours of the morning <3km away from my place at the Esso station. Doesn't hurt anyway.

Why are you doing 240 kPa? When I was on mine, I was about 250-255.

 

[blackestvoid]

yes is kpa, edited

on previous set if i remember correctly around every 3-4 months then lose 5-10kpa, but ps4 is roughly every month lose 5-10kpa

240kpa is car manufacturer recommended and for comfort
but can this tyre withstand 260kpa or even 270kpa?

 

[kebinu]

sure can over pump, just that you get less grip and more wear in the middle. your car should have recommended pressure for full load too, just follow that +10 will do.

 

[EJB]

yes is kpa, edited

on previous set if i remember correctly around every 3-4 months then lose 5-10kpa, but ps4 is roughly every month lose 5-10kpa

240kpa is car manufacturer recommended and for comfort
but can this tyre withstand 260kpa or even 270kpa?

Can, but provided it is within specs and does not overinflate the tyres,

 

[myviowner]

Can, but provided it is within specs and does not overinflate the tyres,

Big brother is always correct... All please adhere to this comment.

 

[EJB]

Big brother is always correct... All please adhere to this comment.

Yes, you are our big brother!

 

[blackestvoid]

sure can over pump, just that you get less grip and more wear in the middle. your car should have recommended pressure for full load too, just follow that +10 will do.

always find it weird why follow car manufacturer for tyre pressure
not follow tyre manufacturer more accurate? since they are manufacturer would know better how much pressure the tyre can take

 

[keenklee]

always find it weird why follow car manufacturer for tyre pressure
not follow tyre manufacturer more accurate? since they are manufacturer would know better how much pressure the tyre can take

IMHO. AFAIK.
Tyre manufacturer do not know which car it would be mounted on.
Car manufacturer specify pressure based in relation to load index.
There are formulas relating to all these.

 

[koster]

Yes, you are our big brother!

Bro brother, got typo bo? U are big brother leh.

 

[koster]

switched over to this tyre for about 6 months
215/45/r17 profile same as previous set but different brand
noticed all 4 tyres will lose about 5-10 kpa every month or so at the same petrol tyre pressure pump, is this normal?
previous brand tyres no such big loss of pressure within such short duration of a month

pumping at 240 kpa but seems like the entire tyre surface is making contact with the road, safe to increase more to 250 or 260 kpa?
if driving alone, want to see 0.5-1cm side of the tyre surface not touching the road, so if fetching 4 bbfa then just nice the entire tyre surface will come into contact with the road

Are you using external TPMS? External TPMS tend to leak more.

 

[EJB]

Bro brother, got typo bo? U are big brother leh.

There can only be one big brother @koster,

 

[koster]

There can only be one big brother @koster,

Big brother, can't be me big big brother. Can ask the other bros here.

 

[EJB]

Big brother, can't be me big big brother. Can ask the other bros here.

All here says @koster is the big big big brother, and big brother is never wrong.

 

[blackestvoid]

IMHO. AFAIK.
Tyre manufacturer do not know which car it would be mounted on.
Car manufacturer specify pressure based in relation to load index.
There are formulas relating to all these.

same way car manufacturers do not know what tyres would be used
tyre manufacturers can give some indicative or tested load as they know what kind of conditions the tyre can handle
speed rating, shape, rubber thickness, etc of tyres car manufacturers would not know so how reliable would be their recommendation vs tyre manufacturer recommendation?

Are you using external TPMS? External TPMS tend to leak more.

not using any tpms
but i do realise ps4 is not as a snugly fit as the previous model tyre against the rims, there is more of a gap on the side wall
my previous tyre totally no gap
PS4 side wall is "rounder" vs my previous tyre which is more "squarish"

 

[keenklee]

same way car manufacturers do not know what tyres would be used
tyre manufacturers can give some indicative or tested load as they know what kind of conditions the tyre can handle
speed rating, shape, rubber thickness, etc of tyres car manufacturers would not know so how reliable would be their recommendation vs tyre manufacturer recommendation?

IMHO. AFAIK.
The load in relation to pressure is fixed, there is a chart for it.
Check the tyre placard in the vehicle. Besides the size, there is the load index and speed rating.
Car manufacturers provides the pressure. Some cars have varying pressure depends on the load on the tyres.

Tyre manufacturers do not specify the tyre pressure because the load on the tyre is unknown to them. The pressure to load is fixed. They only indicate the max pressure on the tyre side wall.

Ideally are tyres based on the recommendation by the car manufacturer i.e. size, load, speed. Of course, no one really cares if the driver deviates. That's when the challenge comes in, what is then the correct pressure ? In addition, car suspension works in tandem with the tyres. Deviation will cause premature wear and tear.

I cite some examples.
From a stock tyre to a higher performance tyre, offering more grip in wet and dry only.
Does it make sense that because of the improve grip, the drivability and FC will be affected ?
What do most drivers do ? Increase pressure.

Also, at what temperature is cold tyre pressure ?

 

[myviowner]

Big brother, can't be me big big brother. Can ask the other bros here.

Yes, i 2nd it. Big brother is one and only. That is # EJB!

All here says @koster is the big big big brother, and big brother is never wrong.

Mai emo lah big brother #EJB. You are the bog brother here... one and only.

 

[EJB]

Diam diam liao, always get targetted here de