OSPW RS 5-Spoke for Shimano 7150

The OSPW RS 5-Spoke for the 105 Di2 series marks a significant shift in design, moving toward a modern, angular aesthetic that complements the latest generation of road bike frames. This system replaces the standard Shimano cage with a reinforced carbon-fiber-reinforced polyamide cage and oversized 13-tooth (upper) and 19-tooth (lower) aluminum pulley wheels. By reducing the chain's articulation angle and utilizing CeramicSpeed’s handbuilt ceramic bearings, this system significantly lowers drivetrain friction. The RS model also introduces enhanced durability features and four customizable spring tension settings, allowing riders to strike the perfect balance between shifting crispness and raw watt savings.

Key Features

• Modern RS Design: The "Racing Sport" design features a stiffer, more angular cage that is structurally reinforced to ensure better shifting precision even under high-torque climbing.

• Further Drive Technology: An updated tooth profile and cage geometry designed to optimize chain flow and reduce mechanical noise.

• Customizable Tension: Features 4 spring tension settings, giving you the flexibility to prioritize maximum efficiency (lower tension) or maximum chain security (higher tension).

• Handbuilt Ceramic Bearings: Equipped with CeramicSpeed's signature hybrid ceramic balls that are 58% lighter and 3-5x more durable than standard steel bearings.

• Enhanced Aesthetics: Available with multiple pulley color options to match your bike's accent colors while significantly boosting the "pro" look of the 105 groupset.

Specifications

• Compatibility: Shimano 105 Di2 RD-R7150 (12-speed electronic only)

• Pulley Material: Aluminum (5-Spoke Design)

• Cage Material: Carbon fiber reinforced Polyamide (PA)

• Max Cassette Size: Supports up to 36T cassettes (standard for 105 Di2)

• Bearing Type: Standard Ceramic or Coated (75% harder races)

Typical Components Included

• Complete OSPW RS 5-Spoke System (Cage + 13T/19T Pulleys)

• CeramicSpeed Pulley Oil (15ml)

• Integrated stop tower and mounting hardware

• Detailed installation and maintenance guide