Leaning inward during a bicycle turn is a basic matter of physics required to counteract the centrifugal torque and maintain balance, making citation unnecessary.
The claim states that leaning is necessary to balance centrifugal forces during bicycle turns. This is a fundamental physical principle of mechanics and everyday observation regarding bicycle dynamics and turning stability. By STEP 0 of the instructions, claims that are trivially true by definition or direct everyday observation are classified as COMMON_KNOWLEDGE, requiring no papers and leaving the index lists empty.