This is a genuine SRAM / Avid post mount disc brake adapter used to correctly space a post mount caliper for larger rotors. It ensures proper caliper alignment and braking performance when moving between common rotor sizes.
This adapter is typically used when upgrading rotor size or replacing a missing or damaged mount spacer on post mount frames and forks.
Key Features
• Genuine SRAM / Avid adapter
• Post mount to post mount interface
• Corrects caliper position for larger rotors
• Simple, durable design
• Black finish to match most brake systems
Compatibility & Use Notes
• Rotor size compatibility: 160mm or 180mm
• Frame mount: Post Mount
• Caliper mount: Post Mount
• Adapter size: 20mm
• Designed for use with post mount frames and forks
• Not compatible with flat mount systems
• Rotor size must match the adapter used
Service / Ownership Context
Rotor size and adapter height must match exactly to avoid brake rub or uneven pad wear. Always confirm rotor diameter before installation and torque mounting bolts evenly. After installation, re-center the caliper and check braking alignment before riding.
Fit & Use Signals
• You’re running a post mount frame or fork
• You’re using a 160mm or 180mm rotor
• You need correct caliper spacing for a rotor size change
• Not a fit for flat mount frames or calipers
• Not a fit for rotor sizes outside 160mm or 180mm
