Introducing the SHIMANO SM-RT81 Centerlock Lock Ring, designed for mountain bike disc brakes. This lock ring offers optimized disc brake pad wear, advanced heat dissipation, and single action tension adjustment for a comfortable and quiet ride. Lightweight and durable, it features superior vibration dampening and easy installation. The all-black finish adds style to your bike. Compatible with SHIMANO SM-RT81 rotors, this lock ring is the perfect choice for your mountain bike. Features:

• For centerlock disc brake systems
• Optimized disc brake pad wear and durability
• Advanced heat dissipation
• Single action tension adjustment
• Superior vibration dampening
• Lightweight, tough and secure
• Easy installation and removal
• All-black finish for added style
• Compatible with SHIMANO SM-RT81 rotors
• Part number: 689228956254, 4524667956259