Your height: 5'10" to 6'3" (178 to 191cm) approximatly (?).
Frame size = 23in/58.5cm
Comments:
Simple and sturdy, minor surface rust here and there.
Mountain Bikes: they are sturdy and designed to go everywhere including off-road. Good for rough riding. In general heavy and with deep thread tires slow on paved roads. Not good city bikes unless narrower and slick tires are installed.
12 speed: good to go just about everywhere except very steep hills. The range of different ratios are more than enough for most people. There are 2 front chain rings and 6 rear gears. - Derailleur: Shimano RS
Tires 26 x 2.125: wide baloon tires for mountain bikes and vintage cruisers, for comfort and all terrain.