Dropout: Dropouts are U-formed notches located at the rear with the bike frame and The underside ends on the entrance fork legs. They supply a safe locale for attaching and holding the wheels in position. Tire: as in common usage. Normally pneumatic. A tubular tire is glued for the wheel https://kylerocqbi.tribunablog.com/top-latest-five-engine-bike-50cc-urban-news-49337139