Originally Posted by Lordofthewings
Originally Posted by Tom3W
...one tire (rear left) has air loss (0.5 bar per day). The valve is fine. So I have to go back to the dealer next week. .
That's a lot of pressure loss on a daily basis. There's probably nothing wrong with the tyre. Depending on who did the tyre change for you, they may have inadvertently damaged the "band" that goes around the centre of the wheel, in which case air will leak. That happened to me a couple of years ago, after having 5 new tyres fitted while the car was in for servicing, one of them went flat overnight. So I took the complete wheel/tyre to a local tyre specialist (where I should have gone in the first place) and they sorted it while I waited. (I have added a second picture to show the damage in the midddle of the band).

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I can't see any damage there Peter although your image does show the normal seal around tyre valve. If you have adjusted any of the spoke nuts though, however slightly, it will cause a leak - I know blush

Below is damage to one of mine (I caused leaks on both back wheels) shown after I had carefully dug out the broken sealant. Check thread here if interested.

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The tell tales were clear to see - twisted sealant at the surface above the spoke nut. A check on sealant band above all spoke nuts should show any damage. A single failure can be fixed without renewing the whole band with correct sealant, Dowsil 1080 available from MWS. Guessing this is what your tyre dealer did although most don't have the sealant - it also needs 48 hours to go off! If needed a full renewal of seal can be done at home with several tubes of sealant and much preparation (see videos). MWS will perform the service but at considerable cost!

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone