... pay it.For the wheel size, we have 10",12", 16", 17",20", 24", 26", 28" available, please advise us ... For 12" wheel, the tire size is 2.125;For 16" wheel, normally we send size of 2.125, but ... read carefully for the following details; we don't accept any refund or return of the kit because of the ... Rotation per min300rpm-450rpmPhase angle120° Welcome to our factory! 16" 48V800W kit bike electric motor