Rotor UBB4630 Evo Steel Bottom Bracket Black

The Rotor UBB4630 Evo Steel Bottom Bracket is engineered to deliver smooth performance, improved durability, and reliable crankset support for modern road and gravel bikes. Designed specifically for BBright frame standards, this premium bottom bracket features a unique threaded sleeve system that securely locks both cups in place, reducing the common issues associated with traditional press-fit systems. Manufactured from high-quality CNC-machined 7075 aluminum, it offers exceptional strength while maintaining a lightweight design. The advanced construction improves bearing alignment, minimizes bearing stress, and helps eliminate unwanted creaks and noises during riding. With externally positioned steel bearings for smoother rotation and enhanced frame stiffness, the UBB4630 is an ideal upgrade for riders seeking efficient power transfer, long-lasting performance, and dependable reliability across road, triathlon, gravel, and cyclocross disciplines.

Key Features

• Threaded Sleeve System: Locks both bearing cups securely for improved stability and reduced noise

• Premium Construction: Made from 100% CNC-machined 7075 aluminum for strength and durability

• Steel Bearings: Provide smooth rotation and reliable long-term performance

• Enhanced Bearing Alignment: Flush-fit design reduces bearing stress and extends service life

• External Bearing Placement: Improves crank rotation efficiency and increases bottom bracket shell stiffness

• Noise Reduction Design: Helps eliminate common press-fit creaks and unwanted sounds

• Internal Protective Sleeve: Prevents cable guides from contacting rotating components

• Optimized for Performance Cycling: Suitable for road, triathlon, gravel, and cyclocross applications

Product Specifications

• Brand: ROTOR

• Model: UBB4630 Evo Steel Bottom Bracket

• Color: Black

• Frame Type: BBright

• Shell Width: 79mm

• Axle Diameter Compatibility: 30mm

• Compatible Crankset Brand: ROTOR

• Bearing Material: Steel

• Body Material: 100% CNC-machined 7075 Aluminum

• Weight: 109g

• Discipline: Road, Triathlon, Gravel, Cyclocross

Bearing Protection & Durability

The Rotor UBB4630 is equipped with labyrinth seal technology that helps protect bearings from dirt, water, and contaminants encountered during demanding rides. This additional protection improves bearing longevity while maintaining smooth performance over extended periods. The improved alignment and reduced bearing load further contribute to lower wear rates and consistent efficiency throughout the life of the component.

Easy Operation / Usage

• Install into BBright-compatible frames with a 79mm shell width

• Designed for use with ROTOR cranksets featuring a 30mm axle

• Threaded sleeve secures both cups for stable installation

• Internal sleeve helps maintain clean operation by protecting cables from moving parts

• Suitable for both competitive and recreational cycling applications

Why Choose This Product

• Reduces common press-fit bottom bracket noise issues

• Improves bearing alignment for smoother pedaling performance

• Lightweight yet highly durable aluminum construction

• Long-lasting steel bearings with contamination protection

• Enhances drivetrain efficiency and power transfer

• Ideal for performance-focused road, gravel, triathlon, and cyclocross riders

• Trusted ROTOR engineering and precision manufacturing

In the Box

• Rotor UBB4630 Evo Steel Bottom Bracket