Tyre pressures for Fortuner with 20" Alloys

[Tuvoc]

Our TRD Sport has 20" factory alloys. The book does not have pressures for these. For the standard Fortuner 17" the recommendation is 29 psi all round I think which seems a bit low.  What are people here running on theirs ?

 

Also 29 psi confirmed here for the AUS model:

Toyota Fortuner Tyre Pressure | CarsGuide

 

Edited April 17, 2021 by Tuvoc

[canthai55]

Does the door sticker list the 20's ?

[DaLa]

We have the same vehicle and I've always thought that 2 bar was low for the size of tyre and vehicle.  One main consideration is the ambient temperature here, and for reference

https://www.tyresizecalculator.com/tyres/tyre-pressure-in-the-summer#:~:text=It is the rule of,for example%2C 2.0 bar).

 

Then there is the loading factor whereby you should increase pressure, particularly in the rear tyres.

 

We also have a Hilux that has a similar recommendation on the door pillar and then when I had the tyres pressurised at the pump they took them up to 2.5 bar.  Hopefully an ex tyre fitter will be along soon to clarify the situation. 

[Tuvoc]

Seems to me they should be running at least 32 psi measured cold. (2.2 bar)

[Kwasaki]

29 - 30 all four will be just fine.

[Kwasaki]

4 hours ago, canthai55 said:

Does the door sticker list the 20's ?

A Norway guy in the village changed the wheels on his Fortuna to 20's and because the tyres were I  reckon so low profile it made the ride worse so he got his OEM ones back. ????

Edited April 17, 2021 by Kwasaki

[Liverpool Lou]

5 hours ago, Tuvoc said:

Our TRD Sport has 20" factory alloys. The book does not have pressures for these. For the standard Fortuner 17" the recommendation is 29 psi all round I think which seems a bit low. 

There's no reason for larger diameter tyres to necessarily need higher pressures.  If you check the recommended pressures for other cars that offer wheel upgrades the recommended road use pressures are mainly the same.  For example, for the Porsche Macan with 20" wheels, the  recommended tyre pressures are identical to those for the 18" wheels.

[KannikaP]

3 hours ago, Tuvoc said:

Seems to me they should be running at least 32 psi measured cold. (2.2 bar)

You know better than those who designed/made the vehicle?

At 32, it's like driving on cobblestones in my Vigo, compared with 29 = smoooooooth.

Edited April 17, 2021 by KannikaP

[canthai55]

13 minutes ago, Kwasaki said:

A Norway guy in the village changed the wheels on his Fortuna to 20's and because the tyres were I  reckon so low profile it made the ride worse so he got his OEM ones back. ????

Never been a fan. Short sidewalls, hard as a rock, no give to them at all.

And be very careful - hit a pothole with those Oh So Pretty wheels and you will be buying a new one, along with the tire which will disintegrate.

Plus I do not like the look at all - huge wheel with what seems to be a tiny brake rotor. Of course you can go to bigger rotors too

Edited April 17, 2021 by canthai55

[Tuvoc]

6 minutes ago, Liverpool Lou said:

There's no reason for larger diameter tyres to necessarily need higher pressures.  If you check the recommended pressures for other cars that offer wheel upgrades the recommended road use pressures are mainly the same.  For example, for the Porsche Macan with 20" wheels, the  recommended tyre pressures are identical to those for the 18" wheels.

 

Yes, the vehicle weight is the same for sure.  And true enough on my old BMW 5 series the pressures for 18" and 19" were the same. However the recommended pressures on those were very much higher than 29 psi for what is surely  a lighter car.

 

Oh well, I think there is an acceptable range, and it depends on the type of driving you do, type of roads you drive on, and how you value ride comfort.  The Fortuner is surely front-heavy due to the 2.8 engine and a bit extra at the front too for the 4WD stuff, so maybe a bit more at the front. I think they have always been well over 29, so I'm going to lower them and simply try it out.

 

 

[Tuvoc]

6 minutes ago, canthai55 said:

Never been a fan. Short sidewalls, hard as a rock, no give to them at all.

And be very careful - hit a pothole with those Oh So Pretty wheels and you will be buying a new one, along with the tire which will disintegrate.

Plus I do not like the look at all - huge wheel with what seems to be a tiny brake rotor. Of course you can go to bigger rotors too

 

Agreed, but the Fortuner 20" sidewalls are still quite tall,  265/50 from memory without going out to check. Not like on a car where the profile would be 30 or 35, and they are like rubber bands.

[fredob43]

The correct answer to the OP question is 29psi all round cold. That's not guess work I have one. You will find the PSI on the drivers door jam. 

Edited April 17, 2021 by fredob43

[TheFishman1]

I always put two psi over in the tires a 35 psi I put 37 psi in all four tires and the tires seem to last two or three times longer go figure not to mention better gas mileage

[mrfill]

1 hour ago, KannikaP said:

You know better than those who designed/made the vehicle?

At 32, it's like driving on cobblestones in my Vigo, compared with 29 = smoooooooth.

Manufactures pressures are averages. They have to be as the ambient temperature is not the same world wide and pressure changes with temperature. Boyle's law is your friend. Changes to pressure will also be needed according to load and there is always plenty of leeway.

The same manufacturer will have designed the vehicle with a certain size wheel and, fitting non-standard wheels means that to maintain the rolling radius, the tyre has to be lower profile, which affect the ride in a bad way. If using the vehicle as intended (off road, rough tracks, not city posing), low profile tyres will be fairly useless as the tyre will not be able to absorb as well..

[PJPom]

Stop messing around, you live in Thailand so do what the locals do, 60 psi.  I nearly had a heart attack when I saw a Thai setting the pump for this pressure and I asked him why so high, his answer, go faster, use less petrol and last longer. 
 

[chilly07]

2 hours ago, Kwasaki said:

A Norway guy in the village changed the wheels on his Fortuna to 20's and because the tyres were I  reckon so low profile it made the ride worse so he got his OEM ones back. ????

Agreed, have done the same. Alloys most unsuitable for Thai roads as they bend if you hit a pothole whereas steel gives a better ride as they have more spring in them

[Tuvoc]

3 hours ago, Kwasaki said:

A Norway guy in the village changed the wheels on his Fortuna to 20's and because the tyres were I  reckon so low profile it made the ride worse so he got his OEM ones back. ????

 

The 2.8 Fortuna TRD Sport was factory fitted with 20" and has different shocks to the standard models.  I assume those shocks have different specs to work better with the 20". I was concerned about impact on ride quality but it does not seem any worse. Prior to buying this we had rented several Fortuners with smaller alloys so we did have something to compare to. 

 

But yes in the distant past with my cars a couple of times I've fitted larger aftermarket alloys with low profile tyres and always regretted it. Looked great,  and better ultimate grip, but a very crashy ride and the extra rolling resistance and extra weight resulted in noticeably heavier fuel consumption as well.

 

[Thingamabob]

If you want a comfortable ride on the current  road  surfaces in Thailand I would suggest 26 front 28 rear for a rear wheel drive vehicle. Most people here will say that's way too low. Ignore them.

[ifmu]

look on the sides of the tires they should have the max tire pressure  for the TIRE ...   use this if u change tires rims ...  the door sticker is not for oversize tires rims .. 

 usually the stamp is much smaller ...  reading glasses 

[DavisH]

4 hours ago, PJPom said:

Stop messing around, you live in Thailand so do what the locals do, 60 psi.  I nearly had a heart attack when I saw a Thai setting the pump for this pressure and I asked him why so high, his answer, go faster, use less petrol and last longer. 
 

go faster but can't stop lol

[Kwasaki]

5 hours ago, canthai55 said:

Never been a fan. Short sidewalls, hard as a rock, no give to them at all.

And be very careful - hit a pothole with those Oh So Pretty wheels and you will be buying a new one, along with the tire which will disintegrate.

Plus I do not like the look at all - huge wheel with what seems to be a tiny brake rotor. Of course you can go to bigger rotors too

Yeah we are on the same page.

I would add so many after market rims are so ugly but I guess Thais like bling rubbish all over there vehicles,  the chrome covers on the fuel flaps make me wanna heave my guts.  ????

[Kwasaki]

42 minutes ago, ifmu said:

look on the sides of the tires they should have the max tire pressure  for the TIRE ...   use this if u change tires rims ...  the door sticker is not for oversize tires rims .. 

 usually the stamp is much smaller ...  reading glasses 

75 psi needed. ????

[alacrity]

5 hours ago, fredob43 said:

The correct answer to the OP question is 29psi all round cold. That's not guess work I have one. You will find the PSI on the drivers door jam. 

 

If the twenties rims are stock for the vehicle, then what's on the plate/sticker at the drivers door is the manufacturers recommendation. Another poster highlighted this earlier and got laughed at!

So if 29psi is stated on the plate/sticker, that's the manufacturers recommendation.

 

If you have a preference for a harder, or softer ride, you can adjust accordingly by increasing or decreasing the recommended pressure. The recommended pressure is an averaged value taking variations of; tire manufacturer, driving surfaces and driving conditions into consideration. These variations are determined by the designers using a rather large database.

 

It's your ride. You're free to 'fine tune' how it handles.

 

 

Edited April 17, 2021 by alacrity
spelling

[Kwasaki]

1 hour ago, Thingamabob said:

If you want a comfortable ride on the current  road  surfaces in Thailand I would suggest 26 front 28 rear for a rear wheel drive vehicle. Most people here will say that's way too low. Ignore them.

I agree my Isuzu I do 28 front and 25 rear with nothing in the back of the truck.

Rides much better until I change the rubbish air suspension that has no adjustment.

[Kwasaki]

8 minutes ago, alacrity said:

 

If the twenties rims are stock for the vehicle, then what's on the plate/sticker at the drivers door is the manufacturers recommendation. Another poster highlighted this earlier and got laughed at!

So if 29psi is stated on the plate/sticker, that's the manufacturers recommendation.

 

If you have a preference for a harder, or softer ride, you can adjust accordingly by increasing or decreasing the recommended pressure. The recommended pressure is an averaged value taking variations of; tire manufacturer, driving surfaces and driving conditions into consideration. These variations are determined by the designers using a rather large database.

 

It's your ride. You're free to 'fine tune' how it handles.

 

Absolutely spot on. ????

[Kwasaki]

4 hours ago, chilly07 said:

Agreed, have done the same. Alloys most unsuitable for Thai roads as they bend if you hit a pothole whereas steel gives a better ride as they have more spring in them

Yeah but ali rims are OK it is the high of the tyre wall  that makes for a better ride such for SUV and Trucks with rubbish suspension.

[Kwasaki]

3 hours ago, Tuvoc said:

 

The 2.8 Fortuna TRD Sport was factory fitted with 20" and has different shocks to the standard models.  I assume those shocks have different specs to work better with the 20". I was concerned about impact on ride quality but it does not seem any worse. Prior to buying this we had rented several Fortuners with smaller alloys so we did have something to compare to. 

 

But yes in the distant past with my cars a couple of times I've fitted larger aftermarket alloys with low profile tyres and always regretted it. Looked great,  and better ultimate grip, but a very crashy ride and the extra rolling resistance and extra weight resulted in noticeably heavier fuel consumption as well.

 

Fair call but its a SUV truck the TRD logo makes me laugh but Thais luv it and low profile tyres in Thailand espesually where there are so many different road surfaces and deteriorating road surfaces make low profile tyre the worse thing to put on rims IMO.

[dodgybros]

36 minutes ago, Kwasaki said:

Fair call but its a SUV truck the TRD logo makes me laugh but Thais luv it and low profile tyres in Thailand espesually where there are so many different road surfaces and deteriorating road surfaces make low profile tyre the worse thing to put on rims IMO.

The OP has stated they are 50 series tyres and therefore not low profile. Personally I think 29 is low, however you need to pick a pressure and monitor tyre wear, if the outside is wearing too low, if the middle is wearing too high, overall it is what gives you the best ride.

[Kwasaki]

5 minutes ago, dodgybros said:

The OP has stated they are 50 series tyres and therefore not low profile. Personally I think 29 is low, however you need to pick a pressure and monitor tyre wear, if the outside is wearing too low, if the middle is wearing too high, overall it is what gives you the best ride.

Agree what you say 8f you mean a lower pressure better for Thai road bumps, 29 psi is not low and IMO  50 is low profile, 70 minimum in Thailand with low psi better.

[dodgybros]

7 minutes ago, Kwasaki said:

Agree what you say 8f you mean a lower pressure better for Thai road bumps, 29 psi is not low and IMO  50 is low profile, 70 minimum in Thailand with low psi better.

Disagree, 35 is low profile, 70 is crazy world wide today, tyres are so much better.