After riding on my tires for a few months, they stuck to the valve stems. The metal was corroded and when I went to change the oil they couldn't remove it to check tire pressure and pump air. I came home and was finally able to take them off, but now they are destroyed. I had to bend and break them to take them off so I could inflate the tires. Ordered high quality plastic liner. Luckily my valve stems weren't too badly damaged.