The mountain bike shock pump is an essential item for use with Aero pneumatic roller skis. Many bicycle pumps cannot be used to inflate the Aero tires. We modify the pump to make it easier to thread onto the Schraeder valve. Most tube failures are a result of not inflating the tires before every roller ski session. The tires must also be inflated about ten pounds above suggested tire pressure as when you untread the pump there is always some air loss. For use with all V2 pneumatic tires.