If you are looking for a reliable and robust crankset for your city bike, the SR Suntour SC344 is a good choice. The 1-fold set has 170 mm long crank arms, a chain guard ring and a chain ring with 44 teeth.
Characteristics: Chain guard ring
Chainring Number: 1 chainring Gearing: 44 teeth
Compatability circuit: 1-speed Build: 4-arm Axle Clamp: Square Tapered Crankarm Length: 170 mm BCD: 104 mm mm Hole circle type: Standard Chain line: 45 mm Bottom Bracket Diameter (mm): 118 mm