What is the air speed of a swallow?

Sonic Riders (ソニックライダーズ) is a racing game developed by Sonic Team's UGA Division (a second-party developer for SEGA) for the video game consoles Nintendo GameCube, Microsoft Xbox and Sony PlayStation 2. It is the fourth racing game in the Sonic the Hedgehog series, preceded by Sonic Drift, Sonic Drift 2 and Sonic R. This time, the characters race on floating airboards, air shoes and motorbikes powered by wind, the Extreme Gear.