Single speed bike urban bike fork material aluminium type mens wheel size 28 inch model 2014 frame material steel frame alloy cromo bike frame sizes cm 56 55 53 58 59 cm frame sizes l xl brakes tektro r340 gear system without gears number of gears 1 braking systems disc brake rim brakes crankset dashun chain kmc z410 rims alex race tyres kenda kwick roller sport stem hl d404 handlebars satori bulhorn race bar saddle velo vl 1411