The CeramicSpeed SRAM Red Force AXS Aero OSPW Coated is a premium drivetrain upgrade engineered for cyclists, triathletes, and time trial specialists who demand maximum efficiency, reduced mechanical friction, and improved aerodynamic performance. Designed for compatible SRAM Red AXS and SRAM Force AXS rear derailleurs, this advanced Oversized Pulley Wheel System combines CeramicSpeed’s low-friction bearing technology with a highly refined aerodynamic cage structure.
Developed in collaboration with renowned aerodynamicist Simon Smart, the OSPW Aero system has been designed to optimise airflow around the rear derailleur while simultaneously reducing drivetrain losses. This dual focus on aerodynamics and mechanical efficiency makes it particularly valuable for time trials, triathlons, road racing, and performance-focused cycling where marginal watt savings can make a meaningful difference.
The system uses a 15-tooth upper pulley wheel and a 19-tooth lower pulley wheel. These oversized pulley dimensions reduce the amount of chain articulation required as the chain travels through the rear derailleur, helping lower drivetrain friction and support smoother power transfer.
Both pulley wheels are precision-manufactured from aluminium, providing a strong, durable, and performance-oriented construction suitable for demanding racing and training environments.
At the heart of the system are handbuilt CeramicSpeed Coated Bearings. These premium ceramic bearings are engineered for exceptionally low rolling resistance and extended durability. The coated bearing races provide additional resistance to wear, helping maintain smooth pulley operation and consistent drivetrain efficiency over prolonged use.
Advanced Performance Features
Designed for compatible SRAM Red AXS and Force AXS derailleurs
Aerodynamically optimised OSPW cage design
Co-developed with aerodynamic specialist Simon Smart
Suitable for road racing, triathlon, and time trial disciplines
15-tooth upper oversized pulley wheel
19-tooth lower oversized pulley wheel
Aluminium pulley wheel construction
Handbuilt CeramicSpeed Coated Bearings
Designed to reduce drivetrain friction
Helps improve aerodynamic efficiency around the rear derailleur
Supports smoother and more efficient chain movement
Two spring tension settings for customised drivetrain setup
Compatible with SRAM Force AXS D2
Compatible with selected 2020 SRAM Red eTap 11-speed clutch derailleur systems
Approximate system weight: 200 g
Aerodynamic Optimisation
Traditional oversized pulley wheel systems primarily focus on reducing mechanical drivetrain friction. The CeramicSpeed OSPW Aero takes performance optimisation further by integrating an aerodynamic cage profile around the pulley system.
The streamlined cage helps manage airflow through one of the most exposed areas of the drivetrain, making the system particularly suitable for riders competing in disciplines where aerodynamic drag is critical. For triathletes and time trial riders, combining reduced drivetrain friction with improved airflow can contribute to more efficient performance over long distances.
Customisable Spring Tension
The system features two rear derailleur spring tension settings, giving riders and mechanics the ability to fine-tune the drivetrain according to riding conditions, chain retention requirements, and performance preferences.
This allows the setup to be optimised for different race environments while preserving the smooth chain movement and low-friction characteristics of the oversized pulley system.
Specifications
Brand: CeramicSpeed
Product: OSPW Aero Coated
Discipline: Road & Triathlon
Derailleur Brand: SRAM
Compatible Models: Red AXS & Force AXS
Upper Pulley: 15T
Lower Pulley: 19T
Pulley Material: Aluminium
Bearing Type: CeramicSpeed Coated Bearings
Spring Tension Settings: 2
Weight: Approx. 200 g
The CeramicSpeed SRAM Red Force AXS Aero OSPW Coated is designed for riders seeking a highly refined drivetrain upgrade where aerodynamics, friction reduction, craftsmanship, and drivetrain efficiency are equally important.
Whether fitted to a dedicated time trial machine, triathlon bike, or high-performance road racing setup, the OSPW Aero system provides a sophisticated combination of oversized pulley efficiency, CeramicSpeed Coated Bearings, aerodynamic optimisation, and adjustable derailleur performance for cyclists aiming to extract maximum performance from their SRAM AXS drivetrain.
