Perishing Tyres

[Wing Commander]

When changing tyres is it usual to have new Valve and TPMS units fitted.? Would appreciate guidance.

The quote from Black Circles included new rubber valves.

I don’t believe that my TPMS units have even been replaced.

[Wing Commander]

How old are the tyres Simon? Exposure to strong sunlight doesn’t help but premature perishing might be worth enquiring via a Michelin dealer.

If I’m reading correctly, rears are Week 20 in 2022, fronts are Week 35 in 2019.

I think I may have a very slow puncture in the front left, so I might look to replace the front tyres.

Black Circles quoting £537.02 fully fitted for two fronts. Michelin Pilot Sport 4 S N0.

Correct with the dates Simon.

Perhaps get a second opinion from a reputable tyre dealer, like ATS Euromaster (owned by Michelin, as are Blackcircles), especially if you suspect a slow puncture.

Thanks, Steve.

[Hunnmere]

Thank you Simon.
The reason I asked was because I thought that the valves and TPMS were a single unit. I know they have a battery fitted so there must be some age related servicing requirement if there is no need for replacement of the valve/sender unit.

[Wing Commander]

Thank you Simon.
The reason I asked was because I thought that the valves and TPMS were a single unit. I know they have a battery fitted so there must be some age related servicing requirement if there is no need for replacement of the valve/sender unit.

I’ll have to let a more technically knowledgeable forum member answer the above.

[andreas]

The reason I asked was because I thought that the valves and TPMS were a single unit. I know they have a battery fitted so there must be some age related servicing requirement if there is no need for replacement of the valve/sender unit.

The TPMS sensor does have an integral valve. The battery isn't generally replaceable, so at some stage the TPMS sensor will need to be replaced. Expected lifetime isn't clear - it's probably related to operating hours - but may be 8 years or so.

[Hunnmere]

The reason I asked was because I thought that the valves and TPMS were a single unit. I know they have a battery fitted so there must be some age related servicing requirement if there is no need for replacement of the valve/sender unit.

The TPMS sensor does have an integral valve. The battery isn't generally replaceable, so at some stage the TPMS sensor will need to be replaced. Expected lifetime isn't clear - it's probably related to operating hours - but may be 8 years or so.

Thank you for the update. I’ll have to start saving up for another Porsche tax item

[SAC1]

Thank you Simon.
The reason I asked was because I thought that the valves and TPMS were a single unit. I know they have a battery fitted so there must be some age related servicing requirement if there is no need for replacement of the valve/sender unit.

TPMS sensors run on batteries that can last anywhere from 5-10 years. Sensor battery life will depend on how much driving you do over time and the conditions that you drive in.

See......
https://www.blackcircles.com/helpcentre ... -batteries

and this info on a USA site.....

https://www.tpmsdirect.com/TPMS_Sensor_ ... _a/850.htm

[Hunnmere]

Thanks for the pointer Steve. Most interesting.

[Wing Commander]

Decided to bite the bullet and get two new front tyres.

Safety first and all that.

Plus the front left does seem to have a slow puncture…

Booked in for Saturday at Porsche Swindon, as they got pretty close to the Black Circles quote.