dfwpreppers.com/2015/08/bicycle-repair/

One of the biggest positive factors in a TEOTWAWKI of the bicycle is that all of the basic maintenance on a bicycle can be performed with non-powered hand tools. Anyone who is reasonably good with his/her hands and can invest in a few hundred dollars’ worth of good tools can repair — or build from scrap parts — bicycles. That could be a valuable skill even before TEOTWAWKI.