Your height: 5'1" to 5'6" (156 to 168cm) approximatly (?).
Frame size = 20in/51cm
Comments:
good quality, 2 recent tires
City Bikes: They are designed for comfort and daily commuting, to go to work, to school, to go shopping, etc.. Compromise between performance, comfort and sturdiness. Often loaded with useful accessories increasing the weight.
21 speed: perfect to go everywhere including going up very steep hills. There are 3 front chain rings and 7 rear gears. - Derailleur: Shimano SIS
Tires 26 x 1.5: medium width tires with small thread or slick, for paved road and occasional off-road.