Construction and material Made from 7075 aluminum alloy for high strength and good bearing capacity. This material delivers a strong, stiff crankset that resists deformation under load while remaining relatively lightweight. Purpose and compatibility Engineered specifically for fixed-gear bicycles as a direct replacement for crankset components. Designed to fit a 48T chainring with a BCD of 130 mm and to work with standard fixed-gear chain thicknesses. Precise dimensions for reliable performance Crank length: 170 mm — a common length that provides effective pedal leverage and pedaling comfort for many riders. Tooth thickness: 3 mm — machined to consistent tolerances to ensure secure chain engagement and smooth power transfer. Chainring: 48T, BCD 130 mm — delivers a balance of cadence and top speed suited to fixed-gear riding. Benefits — why you need it Durability: 7075 aluminum offers long service life under repeated pedaling forces and daily use. Stiffness and efficiency: The rigid construction helps improve power transfer from rider to drivetrain, reducing energy loss. Precise fit and function: Accurate tooth thickness and BCD specification reduce the likelihood of chain slipping and make installation straightforward when matched to compatible components. Maintenance and upgrade: A reliable replacement option for worn or damaged crankset parts, restoring bike performance. Practical applications / use scenarios 1. Urban commuter: Replace a worn crankset on a fixed-gear commuter to regain smooth pedaling and reliable chain engagement for daily rides. 2. Track or training bike: Upgrade to a stiffer, durable crankset for consistent power transfer during track sessions or structured training rides. 3. Workshop replacement part: Use as a service or spare part in bike shops when repairing or rebuilding fixed-gear bicycles that require a 48T BCD130mm chainring and 170 mm crank length. Notes for buyers Confirm compatibility with your bike’s chainline, bottom bracket type, and chain width before purchasing to ensure proper fit. Specifications: 7075 aluminum alloy construction, crank length 170 mm, tooth thickness 3 mm, 48T chainring with BCD 130 mm.