Rims Valve TR618A: Variant: Mounts ETRTO: V5.01.1 Valve height in mm: 50.5 Ø valve hole in mm: 15.7 packaging units: 10-piece tightening torque: 5-8.5 Nm When should metal tyre valves be changed? The best thing is to change the tyres every time! The metal valves are subjected to enormous stress during their service life and are exposed to many different environmental influences. These include varying levels of ozone, solar radiation and the use of chemicals. It does not matter whether it is an Auto tyre valve, truck or bicycle or what material (rubber or metal) it is. Therefore, every time a tyre is changed in the workshop, not only the tyres and rims but also the valves should be inspected and tested. A safe driving experience can only be guaranteed with a regular check of the rim valves. Potential tyre pressure loss can be caused by defective metal or rubber valves. In addition, external damage to the rim valve or corrosion of the valve core can also be responsible. The consequences of tyre pressure loss include various safety risks, with increased tyre wear, increased rolling resistance and increased fuel consumption among the less dangerous ones. However, a broken metal tyre valve can have the negative effect of increasing the braking distance and can lead to unsafe driving with the risk of losing control of the vehicle. In order to minimise the safety risk and to achieve an optimal driving experience, we advise you to have the tyre valves and rim valves checked and replaced regularly.