... and controller have one year guarantee,namely replace new parts with old parts for free(Anthropogenic causes ... is desoldering and rupture within one year,can replace new parts for free.3: Speedhandle,brake handle, ... still can not be used after reparing,can replace new parts for free.4: Wheel,rim and ... breakage occurs within six months, you can replace itfor free.5: Saddle,rearshelf,protection bar,saddle ...