Capsule number 9 - bike

One of Bulma's first capsules. This was used during the early adventures with Goku and Bulma. Although the bike is intended for one person, it can hold two people.  

Capsule number 67 - bike

Much like a hover craft, this bike uses anti gravity technology to move. It can hold one person. 

One wheel bike

This bike was meant to be as a pun to "Escargot as it bears the name "Scargo." The bike is on one wheel and has a reslemblance of a snail. 

Police scooter

Used in the western capital, the Police scooter is much like the capsule 67, only it sits strait up and has a round seat for the passenger.