Hello guys.

I’m using Dunlop J5 175/70 R13 for my car, Toyota Corolla KE70 DX 1981.
Current pressure 34psi for all (by tyre shop guy, different shops telling me different psi. So I’m confused)

Does anyone know what’s the recommended tyre pressure for this specific vehicle model/tyre?

I don’t have the writing on the car (drivers side) or any other parts of the car nor the car manual.

Can anyone shed some light please?

This post has been edited by kalmit95: Nov 6 2020, 09:59 PM

4 such tyres at 29 psi can support a gross weight of 1580 kg .

At 34 psi , they support a gross weight of 1800 kg .

So you are fine with 34 psi , if ride isn't harsh for you .

I would personally give 36 psi a try , for fuel economy .

Note: Your car tare (empty) weight is probably around 1000 kg .

Tire pressure is quite an individual preference where some like bro Zeng above like very firm pressure to save just a bit more fuel while some may prefer more comfort with lower pressures. Of course there's a range that where you should not go too low or too high. For your car which is quite light, I think the ideal range should be around 28-33psi, so I'd suggest you to try first at 31psi then see how you feel about it. If you feel it's too soft then you can try increase a bit to 32-33psi. If you feel too hard then lower it a bit to 28-29psi. Keep adjusting this until you find a pressure that you feel best whereby comfortable enough but also gives responsive enough handling. Just keep in mind if too low, the tread may wear out more on the edges while if too hard then will wear out more in the middle.

I used to drive a 1997 Proton wira with the exact tire size as yours, even though kerb weight could be slightly higher.

I gave 32psi (roughly 220kpa) to all four corners and was satisfied with the overall ride quality even though with 32psi I think it's already on the firmer side.

In that case I’ll give it a few tries on different pressures.

I’m the type who prefers comfort driving

However, should I add the front tyres pressure slightly higher than the rear since the load is higher at the front?

Ps Ke70 is a rear wheel drive.

Yes can just 2psi difference.

cars from this decade using 12~13” rims, tyre pressure usually 28~32 psi only... the cars are quite light below 1000kg

I remember pumping 30 psi as "standard"...after a while when it leaks it gets to proper spec...

Front axle of typical Japanese passenger car like this is likely to carry more load than rear .

Attached below is a load table applicable to you , namely



Minimum tyre pressure of 2.0 bar is 200 kpa which is also equals to 29 psi .



The speed rating T means this tyre is designed for speed 190 km/hr at a tyre air pressure of 270 kpa aka 39 psi .

Add :



This post has been edited by zeng: Nov 7 2020, 09:55 PM

Wow, that’s a good info bro. May I know which website did u get this info from? Thank you.

My car top speed only 140km/h for now. Hehe. 250kpa=36psi

This post has been edited by kalmit95: Nov 7 2020, 10:16 PM

what is the psi, associated with 1000kg of load, per ts' tire size?

TS Dunlop tyre each has a load capacity of 395 kg per tyre at 200 kpa and 415 kg per tyre at 210 kpa .

Hence , a total load capacity of 4 X 395 kg = 1580 kg at tyre pressure of 200 kpa for all 4 tyres , or 415 kg X 4 at tyre pressures of 210 kpa .

The spec does not provide for load capacity at tyre pressures lower than 200 kpa .

ori spec

This tyres are rated with a load index of 82 which gives us 475kgs per tyre.

This is the rating if you’re at the max allowable pressure of the tyre right? Which is 44 psi, written on the side wall.

Therefore at 44 psi your load carrying capacity is at 475kgs per tyre x 4 = 1900kgs.
Correct me if I’m wrong.

And,
How do u find the load capacity associated with different tyre pressures bro?

search for load index inflation table...you can use any tyre brand's table, these are standards... the table will give you proper inflation for the tyre n load, example...



let say your car 900kg + 300kg (4 adults & luggage)...per tyre = 300kg = 660 lbs...ori size 155/70/13 at 26psi can already take 728 lbs, so more than enough, and this matches the recommendation...so 26psi is good. if you carry 800 lbs load, then you need to inflate to 32psi+

but you say i have 175 not 155 wor...load index 82 vs 75 should i try maybe 24psi or lower? answer is you can try but make sure its not too under inflated...but in practice keeping to 26-30psi imho should be ok...

your pm where i got the old data... https://www.tpressure.com/

Nope , this table from TRA/USTMA is meant for P175/70R13 i.e tyre for American market .
TS Dunlop SP Sport J5 175/70R13 (Without prefix P) is meant to comply with European spec ETRTO .

This post has been edited by zeng: Nov 8 2020, 11:42 AM

Dunlop designs your tyre for a load of :
a ) 395 kg at (minimum cold) air pressure of 200 kpa ;
b ) 415 kg at ............................................210 kpa ;
c ) 430 kg at ............................................220 kpa ;
d ) 445 kg at ............................................230 kpa ;
e ) 460 kg at ............................................240 kpa ; and
f ) 475 kg at .............................................250 kpa ,
all of above which with a limit of maximum road speed at 160 km/hr .

Beyond 160 km/hr road speed , Dunlop designs this tyre for higher road speed up to a maximum road speed of 190 km/hr at a cold tyre air pressure of 270 kpa aka 39 psi as per table above .

At maximum allowable cold air pressure of 44 psi , Dunlop is expressly silent on its load capacity IMHO .

Hence 475 kg load capacity is at designed minimum air pressure of 250 kpa aka 36 psi and above .

This post has been edited by zeng: Nov 8 2020, 12:07 PM

ok...found the ETRTO table... 82 index can support 694 lbs per tyre at 22 psi...

your vintage tyre 155 SR 13 aspect ratio is 80... last time pakai tube one...below it's inflation table

it's very close to 82 index...imho safe to use this same range lah... your j5 can pump higher...but I scared too hard may shake your car to pieces...



This post has been edited by dwRK: Nov 9 2020, 05:35 PM

Thank you everyone for your kind info.

Learnt a lot. Will try out different pressures and see which suits my preference.

Cheers.

This post has been edited by kalmit95: Nov 10 2020, 12:30 AM

Hi... All, I'm looking for the brand recommendation for my 4wheel truck. Now I'm using toyo tyre U/T, 255/70r16. No off road drive.

Any suggestions?