Its specs had been solidified with the idea of being able to freely fly across the wastelands of Russia at over 1000 kph and to climb cliffs with a slope of 70 degrees at over 300 kph. The biggest problem in its development had been how to keep the monster on the ground when it would fly off into the air if you didn’t do anything to stop it.

[...]

It could drive up thirty-meter cliffs at a slope of seventy degrees in what seemed like off road bike acrobatics and could clear twenty-meter-wide rivers.

Toaru Majutsu no Index New Testament vol.1