For example, a bike in a ten m (33 ft) radius steady-state flip at 10 m/s (36 km/h, 22 mph) have to be at an angle of 45.6°. A rider can lean with respect to the bike so as to maintain either the torso or the bike more or less upright if desired. https://humansofglobe.com/the-importance-of-checking-tyre-pressure-for-fuel-efficiency/