... you can give precious advise1. Rim Size from 12" 16" 20"2. Bike Frame steel and painting, thicker argon ... and painting, co2 welding steel /suspension fork4. Rim 12" 16" 20" steel alloy or aluminum5. Handlebar and stem CP, ... welding Φ22X0.8-1.2mm6. Tire 12"x1.75, 16"x1.75, 20x1.75 or 1.95 2.125 ... this line for more than 5 years. Near the Tianjin port. Our main products are children bicycle, and also deal ...