G5 Silk

Si3N4 Ceramic Bearings

Silicon nitride ceramic balls in steel races. Harder, smoother, lighter and longer-lasting than full steel. G5 Silk bearings use thin-wall seals (not rubber) for maximum smoothness. Drop them into your hubs, bottom bracket or OSPW and feel the difference.

Material: Si3N4 Ceramic Hybrid
Seals: Thin-Wall (Non-Rubber)
Sizes: 6802, 6902 and OSPW (5x11x4mm)
Use: Hubs, Bottom Brackets, Pulley Wheels
Upgrade From: Standard Steel Bearings

Bottom Brackets

9 BB platforms covered with just two bearing seat diameters. 7075-T6 alloy top hats in royal blue with G5 Silk branding. No dust seals - direct metal-on-metal bearing contact with a 0.1mm recess lift so the crank preloads onto the top hat, not the bearing face. Engineered, not assembled.

Platforms: BB86, BB386, PF41, T47, BSA, B30, BB92, BBRight, 386EVO
Seat Diameters: 39.985mm (BB86/PF41) / 41.985mm (All Others)
Bearings: 37x30x4 Doubled (BB86) / 42x30x7 (Others)
Top Hats: 7075-T6 Alloy, Royal Blue, 29mm Bore
Seals: None - Thin-Wall Bearings Only
Preload: 0.1mm Recess Lift on Top Hat

Revora OSPW

The Oversized Pulley Wheel system. 19T and 13T pulley wheels with G5 Si3N4 ceramic bearings (5mm bore, 11mm outer, 4mm thick). Disc-wheel shape pulleys, polished and clear-coated. Chamfered teeth for Shimano and SRAM profiles. One of the finest OSPW systems you can put on a bike.

Pulleys: 19T (Large) / 13T (Small)
Bearings: 2x G5 Si3N4 Ceramic (5x11x4mm)
Shape: Disc Wheel, Polished, Clear Coat
Teeth: Chamfered - Shimano and SRAM Profiles
Cage: Design Finalising - PEEK Cages Planned
Compatible: Shimano 11/12S, SRAM AXS

Where G5 Silk Fits

G5 Silk ceramic bearings upgrade every Plus Aero hub, every bottom bracket platform, and the Revora OSPW. They are also available as a standalone upgrade for your existing wheels and drivetrain - regardless of brand. Bring it in, we will make it smoother.