Is the valve for a car tyre good or made of aluminum?
This has its own advantages and disadvantages, steel hardness is not easy to damage, aluminum sometimes hit the road bud has extension, in general, no big difference.
A new valve must be replaced when replacing the new tyre. This is because the valve belongs to rubber products, there is aging cycle problems. When the new tire, although the valve did not see the problem, but in the new tire use cycle, the valve may be premature aging, resulting in security risks.
I told you in a professional way that it's good to use rubber. Every time you change the tire, you must ask the tire shop to give you the free change of the vacuum head. Absolutely OK, we always do that!