PumpTire prototype takes riders off of pumping grind
In 2011, Wired.co.uk reported that inventor Benjamin Krempel has an interesting idea for those who ride bicycles and would prefer not to be hassled with pumping their tires every few weeks.
In 2011, Wired.co.uk reported that inventor Benjamin Krempel has an interesting idea for those who ride bicycles and would prefer not to be hassled with pumping their tires every few weeks.