O-ring chain

The rings (O-rings or advanced X-ring and Z-ring profiles) keep factory-packed grease inside and keep dirt out, so the chain lasts considerably longer than a standard chain. The trade-off is slightly more internal friction.

• Use only O-ring-safe chain lube and cleaner; petrol, thinners and stiff brushes damage the rings.
• Pressure washing can force water past the rings.
• The outside still needs lubricating to keep the rings supple and prevent rust.