Space saver spare

[ZombieTKE69]

When your tires wear out replace them with run-flat tires, you can run them on zero tire pressure to the shop / dealer and you won't need a spare.  I love run-flats!

[Big John]

8 hours ago, ZombieTKE69 said:

When your tires wear out replace them with run-flat tires, you can run them on zero tire pressure to the shop / dealer and you won't need a spare.  I love run-flats!

Hi.

My understanding is that you should NOT use RFT unless you have a car with Tyre Pressure Monitoring (and the correct rims) as it is not obvious when you have a puncture and can therefore be dangerous if you continue to drive at speed with no tyre pressure.

Regards

John

 

[Old Peter]

Hi John,

I had a pothole blowout 18 months ago.  I checked the tyre in question and found that the rim was safe and undamaged and there appeared to be enough strength in the tyre to allow me to drive safely the mile and a half home at 10 mph.

Regards,

Peter.

[Big John]

Just now, Old Peter said:

Hi John,

I had a pothole blowout 18 months ago.  I checked the tyre in question and found that the rim was safe and undamaged and there appeared to be enough strength in the tyre to allow me to drive safely the mile and a half home at 10 mph.

Regards,

Peter.

Hi Peter

That is fine because there was an event that made you stop and check, then proceed at slow speed to get home. The problem when used without TPMS is where it is a slow puncture and you come to need high speed braking and/or steering response only to find the tyre is actually deflated!

In that scenario I am pretty sure the insurance would be an issue as you had modified the car from standard.... If RFT are not specified in your handbook as a fitment my advice would be do not fit them.

Kind regards

John

[Old Peter]

Hi John,

What you have said is so true.  There are so many people who allow their tyres to wear till the last minute.

I am regarded by some as a nut case for changing my tyres while there is still "some life in them".

I was coming back from work in 1963 when an  e-type passed me on the Chestier by-pass with on of his tyres having bare canvas.  Luckily I was driving a fast motorcycle and I was able to catch him.  He was horrified but I think he learned a lesson!

Regards,

Peter.

[Coolcity]

Old post I know, but I'm sure you will still be able to tell you have a puncture with a run-flat. Once it's deflated it's bound to affect the handling, surely?

Alternatively you can buy a DIY TPMS for around £25 or less. I've got one, and it's pretty accurate too although I never got around to fitting it on the XF. The display is solar powered and sticks to the windscreen (or dash), and the tyre monitors simply replace the valve caps on the tyre. It's wireless so there's no wiring involved. 

This is similar to the one I have and I've been impressed with it, better than I expected it to be. 

https://www.ebay.co.uk/itm/133963859051

[Wrinkly]

5 hours ago, Coolcity said:

Old post I know, but I'm sure you will still be able to tell you have a puncture with a run-flat. Once it's deflated it's bound to affect the handling, surely?

Alternatively you can buy a DIY TPMS for around £25 or less. I've got one, and it's pretty accurate too although I never got around to fitting it on the XF. The display is solar powered and sticks to the windscreen (or dash), and the tyre monitors simply replace the valve caps on the tyre. It's wireless so there's no wiring involved. 

This is similar to the one I have and I've been impressed with it, better than I expected it to be. 

https://www.ebay.co.uk/itm/133963859051

Not having TPMS on my S-Type this seems like a reasonable safety feature, as long as accuracy is built in. I do rely on regular checking with the good old fashioned dial pressure gauge. Very inclined to purchase one of these and then compare readings between this and the gauge.

Regards, John

[Simon J]

See also this thread 

 

[Coolcity]

That reminds me, I must get around to installing the TPMS on the Jag. If the missus can remember where she put the bits that go on the tyres, that is. 

On the fence regarding run flats, most reviews suggest that they ruin the ride and its probably already slightly compromised as mine has 19" wheels. Tempted though given the price of a spare + tools, although I won't need new tyres for some time yet. 

I guess I'll wait and see how much this latest damn DPF issue costs to put right first.