Tube valve cap keeps breaking For some reason, my valve caps keep breaking. I'm not sure if it happens while I ride or while my bike is not in use, but often when I take the caps off to fill the tubes before riding, I find one of the caps has broken in half like in this image:


What could cause this?

Other info: I fill my tubes to 95 psi
You're simply overtightening the valve caps. These caps do nothing to keep the air in the tube, so there's no need to do them up tightly at all. In fact most road cyclists just throw them away instead of using them.