AERO Oversized Pulley Wheel System (12T/19T) for Road & Gravel Bikes

Upgrade your drivetrain with our newly designed AERO Oversized Pulley Wheel System. Featuring a fully enclosed aerodynamic cage, it significantly reduces wind resistance while saving your watts. Crafted from premium CNC-machined 6061 aluminum, it strikes the perfect balance between high rigidity and ultra-lightweight performance (only 119g).

Key Features:

• Aerodynamic Design: The closed cage design minimizes drag, making it perfect for Road racing and fast Gravel riding.

• Oversized Bearings: 12T upper and 19T lower oversized pulley wheels reduce chain articulation angle, minimizing drivetrain friction and maximizing power transfer.

• Premium Material: Fully CNC-machined aluminum alloy cage and wheels (No plastic parts) ensure durability and precise shifting.

• Lightweight: Weighing in at approximately 119g, it adds minimal weight to your setup.

Technical Specifications:

• Intended Use: Road, Gravel, Racing

• Cage Material: CNC Machined Aluminum Alloy

• Wheel Material: CNC Machined Aluminum Alloy

• Tooth Capacity: 12T (Top) / 19T (Bottom)

• Weight: Approx. 119g

• Color Options: Black / Silver

Model & Compatibility Guide (Please choose the correct model for your drivetrain):

• Model JT12A (For 11-Speed System):

  • Compatible with: R9100, R9150, R8000 SS, R8050 SS (11s)

• Model JT12B (For 12-Speed System):

  • Compatible with: R9200, R8100 (12s)

• Model JT12C (For 12-Speed Wireless System):

  • Compatible with: 12-speed AXS Red / Force (Note: NOT compatible with XPLR versions), and V2 11-speed eTap. Max Cassette size: 36T.

• Model JT12D (For 105 Series):

  • Compatible with: 105 full series (Both 11s and 12s)

Package Includes: 1 x AERO Oversized Pulley Wheel Derailleur Cage