1) Frame:2 years quality warranty. 2) Battery: 12months quality guarantee for Li-ion battery. 3) Electric motor: we provide as long as 12 months quality warranty. 4) Charger/Controller: 12 months quality warranty. 5) The other electric parts: 3 months quality warranty 6) No warranty for tire and V-brake shoes The wheels size, battery packs, brake levers, tires, controllers, etc. are optinal. Motors could be 250w/350w/500w/750w/1000w/1500w/2000w/3000w. Your comments and requirements will be appreciated.