Enhance your BMX and mountain biking performance with the ultimate drivetrain and bottom bracket bundle featuring the Promax EX-2 Bottom Bracket and the Promax HF-3 Hollow Forged Crankset. This high-performance combo is designed for riders seeking lightweight reliability, superior power transfer, and compatibility with modern 30mm spindle systems. **Promax EX-2 Bottom Bracket 30mm, Black** Constructed with forged and CNC machined aluminum cups, the Promax EX-2 Bottom Bracket delivers exceptional strength and stiffness while remaining lightweight. The dual-lip labyrinth low-friction seals effectively prevent dirt and debris ingress, maintaining optimal bearing longevity and smooth pedal operation. Equipped with custom sealed bearings, this bottom bracket ensures long-lasting, efficient performance. Designed to fit 68/73mm wide English threaded shells with a 1.37 shell I.D., its ideal for 30mm crank spindles such as RaceFace and Easton CINCH systems, making it a versatile upgrade for BMX, mountain, and gravel bikes. **Promax HF-3 Hollow Forged Crankset 175mm, 2-Piece, Black** Promaxs premium HF-3 Hollow Forged Crankset is engineered for riders demanding maximum stiffness and lightweight construction. Made from CNC-machined 6061-T6 aluminum, these 175mm crank arms are hollow-forged to optimize strength-to-weight ratio, enhancing power transfer during intense rides. The 30mm spindle enhances rigidity and pedaling efficiency, making it suitable for BMX, mountain biking, and aggressive trail riding. The direct-mount SRAM 3-Bolt compatibility, combined with a 104 BCD spider and optional spider adapter, offers flexible gearing options. Complete with pedal washers for optimal setup, this two-piece crankset pairs perfectly with the Promax EX-2 Bottom Bracket for a seamless, high-performance drivetrain system. **Key Features & Benefits:** – **Materials:** Aerospace-grade CNC-machined aluminum (6061-T6) and forged aluminum cups for durability and lightweight performance – **Performance & Engineering:** Hollow-forged crank arms, 30mm spindle, sealed bearings, dual-lip seals for low maintenance and longevity – **Components & Technology:** SRAM 3-Bolt direct mount compatibility, 104 BCD spider, dedicated for single-speed or customizable gearing setups – **Style & Use Case:** Aggressive trail riding, BMX, and mountain biking requiring stiff, lightweight components for maximum power efficiency and durability Upgrade your bikes drivetrain with this high-quality, gear-enhancing bundle designed to deliver reliable performance, cutting-edge materials, and innovative sealing technology perfect for serious riders seeking speed, strength, and efficiency.