Best Tyre Pressures For A Gen3?

[Grumpy Cabbie]

Basically which are the best/correct tyre pressures for a gen3?

[Fujisan]

Book values are:

17" - 2.3 bar~33psi F & 2.2 bar~32psi R

15" - 2.5 bar~36psi F & 2.4 bar~35psi R

I have my tyres (17") set at 2.5 bar~36psi all round and that seems OK for me.

Listen to some of the guys on the Priuschat they have between 40 and 50psi

[johalareewi]

Book values are:

17" - 2.3 bar~33psi F & 2.2 bar~32psi R

15" - 2.5 bar~36psi F & 2.4 bar~35psi R

I have my tyres (17") set at 2.5 bar~36psi all round and that seems OK for me.

Listen to some of the guys on the Priuschat they have between 40 and 50psi

Apparently, you get better MPG with higher pressure.

Will try mine at 40psi next time to see how it goes.

[Fujisan]

Apparently, you get better MPG with higher pressure.

Will try mine at 40psi next time to see how it goes.

Let's us know how you get on.

The thing that stick's in my mind is that our roads tend to be rather wetter then the roads in California, so for me it is compromise between grip, ride comfort and mpg. ;)

But it will be interesting to see what you think. :)

[Grumpy Cabbie]

Book values are:

17" - 2.3 bar~33psi F & 2.2 bar~32psi R

15" - 2.5 bar~36psi F & 2.4 bar~35psi R

I have my tyres (17") set at 2.5 bar~36psi all round and that seems OK for me.

Listen to some of the guys on the Priuschat they have between 40 and 50psi

Apparently, you get better MPG with higher pressure.

Will try mine at 40psi next time to see how it goes.

Hmmm, be careful. Higher pressure means more mpg but less tyre surface on the roads. Not wise coming into winter! You'll also wear the centre of your tyres quicker than the outside edge leading to premature tyre replacement. You will probably get better mpg in the short term but with many downsides longer term.

[Sagitar]

Deciding on inflation pressure is not a very exact science and the manufacturer's figures are based on a number of compromises to try to take account of a wide range of variable factors. The variables will differ for different drivers based upon journey patterns, vehicle loading, driving style, etc.

The manufacturer's figures work well for most people and if you move away from those figures there are consequences that may be good or bad. For example increased pressure reduces rolling resistance and thereby improves consumption, but it also changes handling and may worsen tyre wear.

I always start by using the manufacturer's recommended figures, then keep a close eye on tyre wear. If the outer edges of the tyre wear more quickly than the centre, it implies under-inflation and I raise the pressure by a pound or two. If the centre wears more quickly than the edges, it implies over-inflation and I reduce the pressure by a pound or two.

The most frequent cause of catastrophic failure of tyres is under-inflation resulting from failure to check inflation pressure frequently. Once a week is a good idea, and don't depend on the gauge at the filling station . . . . .

Sorry for riding my hobby horse - again.

[wooski]

Book values are:

17" - 2.3 bar~33psi F & 2.2 bar~32psi R

15" - 2.5 bar~36psi F & 2.4 bar~35psi R

I have my tyres (17") set at 2.5 bar~36psi all round and that seems OK for me.

Listen to some of the guys on the Priuschat they have between 40 and 50psi

Living in central London with speed bumps everywhere there is only 1 pressure for me and that's stock 33 Front and 32 Rear. My car was delivered with 36 all round and the ride was unacceptable over speed bumps. I lowered them to the book values and the ride improved hugely.

[Fujisan]

The most frequent cause of catastrophic failure of tyres is under-inflation resulting from failure to check inflation pressure frequently. Once a week is a good idea, and don't depend on the gauge at the filling station . . . . .

Personally, I don't trust filling station gauges at all and much prefer to use my own gauge and check the tyres when they are cold.

...And then get out the footpump because the tyres on the wife's car are down again.

Sorry for riding my hobby horse - again.

A good hobby horse to ride.

Living in central London with speed bumps everywhere there is only 1 pressure for me and that's stock 33 Front and 32 Rear. My car was delivered with 36 all round and the ride was unacceptable over speed bumps. I lowered them to the book values and the ride improved hugely.

Don't blame you. The ride is a touch erm... firmer than it was before, when the pressure's were at stock level but luckily there are only a few level changes rather than speed bumps on our estate to slow cars down, so I can cope with that for a few minutes. ;)

God only know's what its like for those people in the States, with the tyres at 50psi! Must be shaking their filling out! :o