- Who
- Bobby Root
- What
- 138.56 kilometre(s) per hour
- Where
- United States (Palmdale)
- When
Bobby Root (USA) achieved a speed of 138.56 km/h (86.1 mph) whilst riding his bicycle on the rear wheel at Palmdale, California, USA, on 31 January 2001 for Guinness World Records: Primetime.
Root used the slipstream of a vehicle to reach the necessary speed before performing his wheelie. He travelled at 1.5 m (5 ft) behind it over a distance of 100 m (328 ft) before reaching the first of measured time distance of 9.75 m (32 ft). The wheelie was maintained for 9.75m (32 ft) for the top speed to be measured.