The DRC Chain Checker 420-530 is a compact tool designed to accurately measure motorcycle drive chain wear and chain slack. It quickly checks the chain's extension ratio to determine when replacement is needed, while the integrated gauge allows fast and easy chain slack measurements.

Features:

• Measures chain extension (wear) to determine when the chain should be replaced.
• Built-in gauge for quickly checking chain slack.
• Compatible with 420, 428, 520, 525, and 530 drive chains.
• Compact, lightweight design for convenient workshop or trackside use.