Praxis 68mm Road ConvOSBB Shmno with R-Collet

Praxis 68mm Road ConvOSBB Shimano with R-Collet is a high-performance bottom bracket engineered for installing Praxis M30 spindle cranksets into BB30, PF30, and compatible Specialized 2014–2015 OSBB road frames. Designed with precision and long-term durability in mind, this advanced bottom bracket system positions the cartridge bearings outboard of the frame based on Shimano specification spacing for improved crank stiffness, smoother pedaling efficiency, and enhanced drivetrain stability.

Praxis uses its patented expanding R-Collet technology to deliver an exceptionally secure and precise fit inside the frame shell. The longer non-drive cup presses into the frame while the shorter drive-side cup threads into place, creating a tightly connected structure that minimizes bearing misalignment, creaking, and movement under load. Unlike conventional systems, the collet evenly distributes pressure across the shell for improved reliability and frame protection.

An integrated compressible O-ring on the non-drive side helps compensate for frame shell tolerance variations, ensuring a consistent fit across compatible frames. Ideal for road cyclists seeking dependable power transfer and smooth performance, this bottom bracket offers a professional-grade upgrade for modern drivetrain systems.

Key Features

• Compatibility: Designed for BB30, PF30, and Specialized 2014–2015 OSBB frames

• Crank Compatibility: Supports Praxis M30 spindle cranksets

• Technology: Patented R-Collet expansion system for secure fitment

• Bearing Position: Outboard Shimano-spec bearing placement

• Frame Stability: Reduces bearing misalignment and frame movement

• Shell Width: Compatible with 68mm road bottom bracket shells

• Noise Reduction: Helps minimize creaking and bearing walk-out

• Installation Design: Threaded cup connection for improved rigidity

Product Specifications

• Brand: Praxis Works

• Product Type: Road Bottom Bracket

• Model: ConvOSBB Shimano with R-Collet

• Shell Width: 68mm

• Frame Compatibility: BB30, PF30, Specialized OSBB (2014–2015)

• Crank Compatibility: Praxis M30 spindle road cranksets

• Bearing Placement: Outboard Shimano-spec positioning

• Installation Type: Press-fit with threaded locking system

• Collet System: Expanding R-Collet technology

• Material: Precision-machined aluminum cups

• Use Case: Road cycling and high-performance drivetrain setups

R-Collet System Performance

• Secure Fitment: Expanding collet design creates an extremely tight frame interface

• Improved Alignment: Connected cup structure helps maintain precise bearing alignment

• Enhanced Rigidity: Outboard bearing placement improves pedaling stiffness and efficiency

• Reduced Noise: Helps eliminate creaks caused by tolerance inconsistencies

• Frame Protection: Even pressure distribution minimizes stress on frame shells

• Tolerance Compensation: Integrated O-ring adjusts for frame shell width variations

Easy Operation / Usage

• Press the longer non-drive side cup into the frame shell

• Thread the shorter drive-side cup into the non-drive cup

• Tighten according to recommended torque specifications

• Install compatible Praxis M30 crankset

• Check crank rotation and bearing smoothness before riding

Why Choose This Product

• Advanced Engineering: Patented Praxis R-Collet system improves overall bottom bracket stability

• Reliable Performance: Helps prevent bearing movement and alignment issues

• Smooth Drivetrain Function: Optimized for efficient power transfer and reduced friction

• Broad Compatibility: Works with multiple modern press-fit road frame standards

• Professional Quality: Built for serious road riders and performance-focused cyclists

In the Box

• 1 x Non-Drive Side Bottom Bracket Cup

• 1 x Drive Side Bottom Bracket Cup

• Integrated R-Collet System

• Pre-installed Bearings

• Installation O-Ring