Different tyre speed setting on car

TheEffects

Hi

I currently have both rear tyres 185/65R15 88T max psi 36

front tyres are of 185/65R15 88V max psi 44

Now I need pump up my tyres but confused. Do i use the max psi reading on each tyres, as listed above. or do i ensure the entire car is balanced such as pumping all to 36 psi as this is the lowest psi reading for the rear tyre due to its speed rating being slighly lower?

Any help would be greatly appreciated

Thanks

TheEffects

smileygill

You don't have to pump them up to the maximum allowed!

If you have a handbook for the car, see if it has a recommended pressure - usually in the "routine maintenance" section. Alternatively, most cars have a sticker somewhere - try inside the glovebox or in the door shuts at the front - or you could just do a web search for recommended tyre pressures for your make/model of car. It may be different front to rear, but it almost certainly isn't 44/36.

HTH.

Avoriaz

smileygill wrote: »

..Alternatively, most cars have a sticker somewhere - try inside the glovebox or in the door shuts at the front - ..

Sometimes it is inside the fuel filler recess or on the flap.

kingstreet

The higher pressures are usually for a full load of four/five people and a boot full of luggage.

The lower pressure will be for a couple of people.

Vary the pressure to suit your journey.

goonarmy

Tire sleed setting or pressure? The thread title doesnt tally with the question.

Iceweasel

Exactly what car is this on?

I'm doubting that a 'T' rated tyre is the correct fitment.

They are adequate if you naively just think they are OK because of not going to be exceeding 118mph in the UK.

I would not be happy until I had checked out why someone had fitted tyres so different from normal.

Likely to be on price difference.

redux

Iceweasel wrote: »

Exactly what car is this on?

I'm doubting that a 'T' rated tyre is the correct fitment.

They are adequate if you naively just think they are OK because of not going to be exceeding 118mph in the UK.

I would not be happy until I had checked out why someone had fitted tyres so different from normal.

Likely to be on price difference.

If the published maximum speed of the car is say 110 mph or less, then there is nothing wrong with having T rated tyres

The price difference between some speed ratings may be barely anything, like under £2, so some dealers might not bother holding stock of 2 or 3 speeds for each brand

Iceweasel

redux wrote: »

If the published maximum speed of the car is say 110 mph or less, then there is nothing wrong with having T rated tyres

The price difference between some speed ratings may be barely anything, like under £2, so some dealers might not bother holding stock of 2 or 3 speeds for each brand

Absolutely correct - which is why I asked what car it was on.

Richard53

The max pressure stamped on the side of the tyre is the maximum pressure allowed for that tyre, fitted to any suitable vehicle, of any allowable weight or loading, anywhere in the world. For the individual vehicle owner, it is irrelevant (apart from as a working limit when you are trying to get a new tyre's bead to pop on). Standard pressures (for best grip, wear and longevity) will be a *lot* lower.

The manufacturer of the car will know what pressures worked best in testing, and as others have said it will be on a sticker somewhere on the car. Recently, it seems to have been standardised to one of the front door recesses. Or you could contact the tyre's manufacturer. Or a Google search (with the appropriate caveats).

On a FWD car, it's likely that the front pressures will be the same regardless of load, whereas the rears will vary widely depending on loading. It's important to get it right.

Hintza

If you don't know what tyre pressures you should have then pump them all to 30, until you find out.

Prothet_of_Doom

there are 3 issues here.

1) What pressures should the tyre be set at?
2) What speed rating should the tyre have?
3) What should I do If T is too low?

1and 2) phone up main dealer, tell them the reg number, ask them what size and speed rating were fitted and what pressures Front and Back, fully laden and empty.

You should have 4 psi setting there. Check the size and speed rating against what you have.

3) If T is not standard, phone up your insurance company, and ask them for a dispensation (in writting) to continue to insure the car. Given that the speed limit is 70 mph, most insurance companies will allow the fittment of T rated tyres as they should be good well into licence loosing speeds.