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✨ Product Features:170mm crank arm length, without any overlap between crank arms and chainring bolts, ensures ultimate chain retention, extended life, reduced friction and noise, and a great experience for you. ✨ Easy Installation: The left crank arm has standard precision cut holes to ensure a perfect fit on the bike, and comes with a removal tool for easy installation and use. ✨ Application Widely:Bicycle crank arms are suitable for off-road bikes, electric bikes, folding bikes, mountain bikes,fixed gear bicycle, etc. ✨ Warm Tip: The spindle interface type is a horizontal square cone, please check whether the direction of your right crank arm is a square or a diamond, and keep the left and right arms in the same hole. ✨ High-quality material: Bike left crank arm 170mm is made of high quality metal, strong, light weight, high strength, anti-deformation, durable