Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Which rear wheel axle does my “Citizen Gotham 7” folding bike use?
That looks like standard 10mm bolt on axle.
Citizens' web site photos show a standard quick release on the Citizen 7. The three speed internally geared models use a bolt on axle.
Required, but never shown