90 degree tyre valve extension

[Dave48]

There can be the risk of air loss with some of these extensions. I use a Schrader "pencil type gauge that fits at an angle to the valve so clears the wheel/brake discs.Have used on a variety of bikes without problem and for many years-its till accurate & wasnt expensive.
I replace the cheap plastic dust caps with nice alloy ones that contain an "o"ring seal. Dont take chances with tyres!