This bike is designed for adults with heights 170-180cm. For comfortable ride bike is equipped with 28" tires. City bikes are used for riding in the city. Its position is upright so that you can easily control it and have a comfortable ride. Bike has 21 speeds to choose from and comfortabl pedals to provide more secure and efficient ride. Fork: Steel / Front derailleur: Dacron TX 30 / Rear derailleur: Dacron TZ 35 / Stem & handlebar: Steel / Chain wheel: Steel 42 T / Freewheel: SunRun / Chain: DT 050 / Fronthub: Steel 36 / Rearhub: Steel 36 / Rim: Double wall alloy / Seat tube: Steel / Tyre: City tyre / Accessories (not included): Chain housing, Front & Rear carrier, Front & Back lighting, Lock // Assembly: Bicycle comes in the original factory package, 85% assembled (front wheel, handlebars, seat, pedals might be removed and need installing). Tools for assembling the bicycle are not included in the package. Client is responsible for correct bicycle assembly, preparation for use and initial maintenance of the bicycle at any service centre (service record in the maintenance sheet/warranty card is mandatory). In case of violating this rule warranty will not be effective. Regarding the assembly of the bicycle we recommend to consult a qualified technician.