One new tyre - different from other three: tyre pressure?

[cowmos]

Hello everyone,

This is my first post - please be gentle with me!

We own a relatively new converted VW campervan (T28 T-Line TDI BMT, '18 reg) which we've had for around 18 months now. Unfortunately we recently experienced a slow puncture on the offside rear tyre, and arranged for a local garage to put a new one on. They only had two in stock, so I picked the cheapest. That tyre is now a different brand from the other three, and I wondered what the tyre pressure should be for this new tyre. For info, I've been ensuring the tyres were at 40psi. When I measured the pressure in this new tyre over the weekend it was showing as 55psi. This had me concerned, hence this post.

The details of the tyres are as below:

Both front tyres - Roadmarch, 275/40ZR20 106W XL (both maintained at 40psi)
Nearside rear - Roadmarch, 275/40ZR20 106W XL (maintained at 40psi)
Offside rear - Bridgestone Turanza Enliten, 275/40R20 106Y (tyre pressure machine says psi is 55)

I guess my question is should this new tyre be maintained at 55 whilst the others are at 40? Should I reduce the new tyre to 40, or increase the others to 55? Or, perhaps, everything is okay?

Grateful for any help / advice. If you'd like further information, please let me know.

Kind regards,

Chris aka cowmos

 

[DaveD]

Welcome to the Forum!
In my opinion and experience most tyre depot staff aren't too fussed about inflating the tyres to the correct pressure, unless you tell them what it is, and 55PSI would be about right for many commercial vehicles so it's near enough for them.
So, no, you shouldn't leave it at 55 PSI, drop it down to 40 PSI, the same as the others.
I don't know if 40 PSI is the optimum pressure for that size as I have never run that size, neither do I know how heavily loaded you run your van, but it sounds somewhere near and you might want to do your own research on here regarding that using the search function.
Here's one to get you started;

Thread '20” Tyre Pressure'

19 Apr 2019

Hello all

On 275/35 and 265/40 applications we’ve always gone with and recommended 40psi all round. Recently we’ve been experimenting with different pressures.

We’ve had two t32 Kombi s running Bilsteins and 265/40, one on 36psi and the other on 40psi. Both have covered 12000 in a year.

The rear tyres are worn out on the 40psi van, evenly, but illegal. The other van still has 3mm + left.

Bilstein B14s does increase tyre wear, as more is demanded of them, but running slightly pressures, not only increases ride comfort, but also tyre life.

We are playing around with the pressures on...

• BognorMotors
• 20" 265/40/20 275/35/20 275/40/20 towing trailer tyre pressure tyre wear
• Replies: 270
• Forum: Wheels & Tyres

• 

 

[cowmos]

Welcome to the Forum!
In my opinion and experience most tyre depot staff aren't too fussed about inflating the tyres to the correct pressure, unless you tell them what it is, and 55PSI would be about right for many commercial vehicles so it's near enough for them.
So, no, you shouldn't leave it at 55 PSI, drop it down to 40 PSI, the same as the others.
I don't know if 40 PSI is the optimum pressure for that size as I have never run that size, neither do I know how heavily loaded you run your van, but it sounds somewhere near and you might want to do your own research on here regarding that using the search function.
Here's one to get you started;

Thread '20” Tyre Pressure'

19 Apr 2019

Hello all

On 275/35 and 265/40 applications we’ve always gone with and recommended 40psi all round. Recently we’ve been experimenting with different pressures.

We’ve had two t32 Kombi s running Bilsteins and 265/40, one on 36psi and the other on 40psi. Both have covered 12000 in a year.

The rear tyres are worn out on the 40psi van, evenly, but illegal. The other van still has 3mm + left.

Bilstein B14s does increase tyre wear, as more is demanded of them, but running slightly pressures, not only increases ride comfort, but also tyre life.

We are playing around with the pressures on...

• BognorMotors
• 20" 265/40/20 275/35/20 275/40/20 towing trailer tyre pressure tyre wear
• Replies: 270
• Forum: Wheels & Tyres

• 

Thank you so much for your response! I forgot to mention that the van has been ‘lowered’ in that it rides closer to the ground. The van tends to be used as a commuting vehicle, but there are occasions when we head out for a couple of nights somewhere with a drive-away awning, bedding etc (just the two of us).

 

[Howzat]

The tyre pressures should be the same across the axle. Most of the weight is in the front (engine) so it's normal for the pressure to be slightly higher on the fronts than rear unless you have a conversion then it's normal for them to be all the same.
If you over inflate any tyre then wear will be more noticable in the middle of the tread and conversely, under inflated on the inner and outer edges.
@DaveD gives you good advice.

 

[Kind of Blue]

Hello everyone,

This is my first post - please be gentle with me!

We own a relatively new converted VW campervan (T28 T-Line TDI BMT, '18 reg) which we've had for around 18 months now. Unfortunately we recently experienced a slow puncture on the offside rear tyre, and arranged for a local garage to put a new one on. They only had two in stock, so I picked the cheapest. That tyre is now a different brand from the other three, and I wondered what the tyre pressure should be for this new tyre. For info, I've been ensuring the tyres were at 40psi. When I measured the pressure in this new tyre over the weekend it was showing as 55psi. This had me concerned, hence this post.

The details of the tyres are as below:

Both front tyres - Roadmarch, 275/40ZR20 106W XL (both maintained at 40psi)
Nearside rear - Roadmarch, 275/40ZR20 106W XL (maintained at 40psi)
Offside rear - Bridgestone Turanza Enliten, 275/40R20 106Y (tyre pressure machine says psi is 55)

I guess my question is should this new tyre be maintained at 55 whilst the others are at 40? Should I reduce the new tyre to 40, or increase the others to 55? Or, perhaps, everything is okay?

Grateful for any help / advice. If you'd like further information, please let me know.

Kind regards,

Chris aka cowmos

Tyre Pressure should be equal across the axle! Their is a correct pressure for all tyres. Recommended tyre pressure are printed on a sticky usually stick on the drivers door-jam or somewhere similar. If your tyres are different to those on the sticky you can ascertain correct pressures by finding a Tyre Comparison Site on line, many have a section for tyre pressures. It will have a place for recommended tyre pressure of existing tyre and will ask details and also the new set up what ever that may be and the details if different put into the require place as well as any other details asked for. Compute press what ever and the new recommended tyre pressure will be shown for what ever size ect Do this for front and rear and also unloaded and loaded keep a note good idea to put it on a sticky ins a similar place to the recommended tyres and pressures. The pressures suggested are correct to tyre organisation standards. One member I understand writes to Michelin instead of using a tyre Comparator, also fine they should come out similarly. It is a legal requirement to have correct pressures . As was suggested above tyre fitters in depots are not the ideal places to ask, in my experience tyres come away nowhere near correct usually way above. I always check and set them my self after leaving, its the drivers responsibility.

 

[doncarlyon]

Tyre fitter hasn't taken into account that it's an aftermarket 20" wheel