1.tire:front 20*1.75 rear:26"*1.75 2.chainwheel:alloy 3.brake:roller brake 4.derailleur:shimano nexus 3 speed Cargo Bike,shimano nexus 3 speed tricycle,rickshaw,big wooden carrier... Cargo bike,Tricycle, rickshaw,Our main productsinclude Electric bicycle,bicycle,bmx&freestyle bicycle, beach cruiserbikes, folding bikes, city bikes, kids'bikes etc...., The company have passedISO9001: 20080 ...