Non run-flat tyres on NX 450h+ which has Run-flats

[4Ears]

Sorry in advance if this has already been covered but as a newbie here, I haven't got my head around the search system yet......

Has anyone fitted Crossclimate tyres or similar non-run-flats in place of their OEM Bridgestone summer run-flats and if yes, do you carry a tyre repair kit and if you used it would it mess up the tyre pressure monitoring valves?  Coming from a Land Rover Discovery 4 this run-flats and no spare tyre stuff is worrying territory to me.

[LenT]

7 hours ago, 4Ears said:

do you carry a tyre repair kit and if you used it would it mess up the tyre pressure monitoring valves?  Coming from a Land Rover Discovery 4 this run-flats and no spare tyre stuff is worrying territory to me.

Firstly, if you have run-flats you don’t need to use an injectable tyre repair kit.  They are both temporary solutions designed to enable you to drive slowly for a limited distance to a place of safety or repair.

As for the TPMS valves - well the solution is designed to harden on exposure to air and to be distributed over the interior of the tyre by motion as well as air movement.  So inevitably it will lodge in the valve stem and fill the pressure sensor hole in the TPMS valve.  Few - if any - tyre specialists will agree to repair a RF because they have no way of knowing how much damage has been caused internally to the tyre by running the wheel rim on it.

Similarly, even if they try to clean the sensor and replace the entire valve stem, they cannot guarantee that the hardened injectable solution has not affected the TPMS valve’s performance.  

One brand of solution (Slime) claims to be safe for use with TPMS valves - the valve makers claim that none are!  I’m sure Lexus has a definitive answer regarding its own supplied product, which you will find tucked away in the Manual.  But I would suggest being resigned to replacing the TPMS valve if you have to use the injectable repair kit!

As another thought - and I don’t know the car well enough to comment - but is it possible to stow a SpaceSaver tyre in the boot?

[4Ears]

Thank you and your answer clarifies what I suspected, putting Slime or similar into a non-run-flat puncture tyre will potentially damage TPMS valve so it will need to be replaced.  Hmm, not ideal.  Perhaps a small price to pay if it gets you home though.  If they did good all season run-flat to fit the 450 it would not be an issue but the choice is very limited with just two summer RF tyres available in the size.  A space saver may be a possible.  Thanks again 👍

[Hayzee]

3 hours ago, 4Ears said:

A space saver may be a possible. 

I have a space saver which fits my NX 450h+ but there is no way of storing it under the boot floor due to an array of electronics and the 12v Battery. The only way is to have it in the boot itself, which is far from ideal 😒

[PaulWhitt20]

I find it rather ironic, that they fit run flat tyres or provide puncture repair goo to save weight and thus CO2, but when you do get a puncture you have the throw away a tyre that could have been repaired.  Does the CO2 used to produce the new tyre outweigh the CO2 saving on the reduced weight? Discarded tyres are also bad for the environment.

[DavidCM]

I suspect the truth is not a saving in CO2,but ££££ or ¥.