Originally Posted by
danmc
I tell you an easy way to determine if you want/need CO2 in addition to a hand pump; try using your hand pump to pump up a totally flat tire to full pressure whilst in the controlled comfort of your living room and then decide if you want to go through that out in the road in the sun or the rain or the wind or in the dark.
Having done all that, all I can say is that it's amazing our species has made it this far, without getting eaten on the side of the road by wolves while we were all fixing our flats.