What does cross-chaining refer to in cycling?

Cross-chaining refers to using the largest chainring in conjunction with the largest rear cog, or alternatively using the smallest chainring with the smallest rear cog. This practice places excessive strain on the drivetrain and can lead to inefficient pedaling and increased wear and tear on the bike's components. By engaging such gear combinations, the chain has to bend at an extreme angle, creating more friction and potentially causing issues with derailleur alignment, which negatively affects performance and can lead to mechanical failures.

Maintaining a straight chainline is essential for optimal efficiency and performance, but it is not the definition of cross-chaining. Adjusting tire pressure for better grip is related to handling and traction, while changing gears for better speed pertains to shifting for efficiency, neither of which define the specific action of cross-chaining within the context of gear usage. Understanding the implications of cross-chaining can help cyclists avoid potential mechanical failures and improve their overall riding experience.