safe bike where you dont need a seperate pump or battery
have a biometric lock which basically switches the hub on the back wheel one of 4 ways
2. freewheel but drives a pump to reinflate the wheel
actually, could also have
5. normal + electric motor for uphill running off generator running backwards from either capacity
or from tire pressure...
then you could just always have slightly flat tires too....
better biking through sustainable technology (longer intervals between new tirs, no batteries, and so on...)