Lightweight 170 mm hollow integrated crankset engineered for more responsive, efficient riding and reliable longterm performance. Key benefits Reduced weight, faster response: Hollow integrated crank arms (170 mm) weigh 550 g for the pair, lowering rotational mass to improve acceleration and bike agility. Efficient power transfer: Thickened aluminumalloy construction increases rigidity so more pedaling force is transmitted to the drivetrain with less energy loss. Fewer chain drops: 7075T6 aluminum 104 BCD singlespeed chainring uses a narrowwide tooth profile to hold 7–12 speed chains securely, reducing the risk of chain drops on rough terrain. Low maintenance and lighter assembly: The singlespeed chainring removes unnecessary material for a cleaner gear ratio progression, easier cleaning, and lower overall weight. Durable, sealed bottom bracket: Comes with a hollowintegrated BC1.37' x 24T sealed bottom bracket for improved sealing and longer service life in wet or muddy conditions. Compatibility and specifications Crank arm length: 170 mm Crank arm set weight: 550 g (pair) Chainring material and fit: 7075T6 aluminum, 104 BCD Chain compatibility: 7–12 speed chains Chainring type: Narrowwide singlespeed design Bottom bracket: BC1.37' x 24T hollowintegrated sealed bottom bracket Spindle compatibility: 24 mm spindle cranks Frame bottom bracket shell: 68–73 mm Practical use scenarios Trail and crosscountry riding: Lighter crank arms and a narrowwide chainring help maintain chain retention and improve acceleration on technical climbs and quick transitions. Oneby (1x) drivetrain upgrades: Ideal for riders converting to or optimizing a singlering setup who need a durable, lightweight chainring compatible with 7–12 speed chains. Daily commuting and wetweather riding: Sealed bottom bracket reduces maintenance and protects bearings from water and grime for reliable everyday use. Installation notes Designed for frames with a 68–73 mm bottom bracket shell. Compatible with 24 mm spindle cranks; ensure spindle and crank interface match before installation. Chainring uses 104 BCD mounting pattern. This crankset combines a lightweight hollow design, strength aluminum materials, narrowwide chainring security, and a sealed bottom bracket to deliver a responsive, efficient, and lowmaintenance upgrade for compatible mountain bike setups.