Frequently Asked Questions
How do I measure 12 links accurately?
Place the chain on the bike under light tension. Use a steel ruler to measure from the centre of one pin to the centre of the pin exactly 12 links away (that is 13 pins total, counting the first one). Read to the nearest 0.01 inch. Alternatively, use a dedicated chain wear gauge which gives a direct percentage reading.
Why does chain wear matter for my cassette?
As a chain wears, its effective pitch lengthens. The cassette cog teeth wear to match the stretched chain. When you install a new chain on a worn cassette, the new chain sits at positions that the worn cog teeth cannot hold, causing skipping or jumping under load. Replacing the chain early - before 0.75% wear on most drivetrains - prevents cassette damage and saves significant money.
How often should I check chain wear?
Check every 500-1,000 km or every 4-6 weeks of regular riding. If you ride in wet or muddy conditions, check more frequently - abrasive grit accelerates wear dramatically. A fresh chain after a drivetrain clean gives you a zero reference point.
Do I need to replace the chainrings too?
Chainrings generally last 2-4 chain replacements if you replace chains early. Look for hooked or shark-finned teeth, or if a new chain skips on the ring under hard pedalling. Higher-tooth chainrings (50T, 52T) last longer than smaller ones (34T, 36T) because each tooth takes fewer load cycles per kilometre.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.