There are countless questions about the Star Trek universe. Picard or Kirk? Spock or Data?  How do Dilithium Crystals work?..but the most important question is Will there be motorcycles?...Yes.

Via: Star Trek: Relic

 The Harley Davidson HG888 Heavy Grav Bike is a large antigravity bike, capable of carrying two persons and a moderate amount of stowage in the rear panniers.

"Widely used as short-range transportation and for recreational purposes, antigravity bikes, commonly called grav bikes, are common throughout the Federation. At their most basic, they consist of an antigravity generator, a microfusion power source, an RCS thruster system and a seat. Grav bikes are the modern equivalent of the Earth motorcycle. While they can be used in space with the aid of an environmental suit, they are almost always encountered on a planetary surface. Grav bikes are incapable of achieving orbit, and are generally operated at heights of less than 50m."