The sleepy one
Crankshaft suffers from narcolepsy meaning he tends to doze off or have periods of micro sleep. Resulting in problems especially when he's driving or flying he tends to crash into things.
Being a racer may not be the best profession for him. His brothers are constantly watching him to make sure he isn't asleep when he's flying lest he crash into something.
Crankshaft always seems to be a bit on the dopey side and always looks like he's not getting enough sleep ever. He doesn't talk too much either but he's very close with his brothers.