Enhance your bike's performance and durability with this Hollow Integrated Crank, expertly crafted for mountain bikes, road bikes, and folding bikes. Constructed from high-strength aluminum alloy and chromium molybdenum steel, this crankset combines robust materials and precision engineering to deliver reliable, long-lasting operation with smooth rotation and reduced noise. Key Features: · **High-Strength Aluminum Alloy Crank:** Forged with widened and thickened edges and corners to withstand stress without breaking, ensuring exceptional durability during intense rides. · **Chromium Molybdenum Steel Shaft:** Provides enhanced stability and strength to the crank and hollow shaft, improving overall performance and longevity. · **External Thread Bearing with Aluminum Alloy Frame:** The aluminum alloy outer frame increases rigidity, reduces operational noise, and simplifies maintenance and lubrication for smooth, consistent use. · **Stable Threaded Lock Mechanism:** Exquisite threading and threaded pair lock design prevent loosening and lateral movement, eliminating abnormal noise and maintaining crankset stability. · **Wide Compatibility:** Designed for crank sprockets with a 130mm bolt circle diameter (BCD) and compatible with bottom brackets sized 68-73mm with BC1.37-24T threaded specifications, fitting most standard bike frames. Specifications: · Material: Main Aluminum Alloy, Shaft Chromium Molybdenum Steel, Bottom Bracket Tube PP · Crank Size (Aperture): Approx. 170mm / 6.7in · Crank Shaft Size: Length Approx. 116mm / 4.6in, Outer Diameter Approx. 24mm / 0.9in · Crank Shaft Inner Diameter Thread Specification: M18 Thread · Applicable Crankset BCD: Approx. 130mm / 5.1in · Bottom Bracket Size: Total Length Approx. 91.5mm / 3.6in, Inner Diameter Approx. 24mm / 0.9in, Outer Diameter Approx. 44.6mm / 1.7in · Bottom Bracket Thread Specification: BC1.37in-24T · Outer Diameter of Bottom Bracket Thread: Approx. 34mm · Bottom Bracket Type: Threaded · Bottom Bracket Applicability: Fits 68-73mm bottom brackets with built-in sealed bearing for smooth rotation This Hollow Integrated Crankset is engineered to provide a sturdy, noise-free cycling experience with easy maintenance and excellent compatibility. Upgrade your bike’s drivetrain with this precision-crafted crank for improved stability, performance, and durability on every ride.