This 170 mm crank arm is a precision replacement compatible with horizontal square-taper spindles. It combines accurate machining and durable aluminum alloy construction to give a secure fit, reliable power transfer, and long service life. Key benefits Precision fit: The spindle hole is precision-cut to standard dimensions for a tight, wobble-free fit and straightforward installation. Reliable performance: Solid aluminium alloy construction delivers high strength and resistance to deformation so the crank maintains alignment under load. Clearance-engineered length: 170 mm crank arm length is designed so there is no overlap between the crank arm and the chainring bolts, preventing interference during pedaling. Easy to install: Standard square-taper interface makes replacement or upgrade simple on compatible bikes. Specifications and compatibility Spindle interface type: Horizontal square taper. Confirm your bike uses this spindle type before ordering. Spindle hole orientation: Please check that the orientation of your right crank’s spindle hole is rhombic (diamond-shaped). Both left and right crank arms must have the same spindle-hole orientation for correct fit and safe operation. Crank arm length: 170 mm (no overlap with chainring bolts). Material: Premium aluminium alloy — high strength and deformation resistance for durable, long-term use. Practical applications Replacement for worn or damaged crank arms on bikes with horizontal square-taper bottom brackets. Upgrading older or commuter bikes for a more reliable, precisely fitting crank arm. Restoring classic or retro bicycles that use square-taper spindles where original-style components are required. Notes for buyers Verify your bottom bracket spindle type and the right-crank spindle-hole orientation before purchase to ensure compatibility. Use appropriate tools and torque settings when installing. If unsure, have a qualified bike mechanic complete the installation. This crank arm preserves original specifications for square-taper systems while providing a durable, accurately machined option for replacement or maintenance.