· Optimal Ball Size: Experience superior performance with VANSIHO Crank Bearings featuring a 5/16" ball size and 7/9 balls. Precision engineering ensures reliable and smooth operation for your BMX, Beach Cruiser, and Stretch Bicycles.· Versatile Compatibility: These crank bearings are tailor-made for BMX cranks, making them an ideal choice for various bikes, including beach cruisers and stretch bicycles. Enhance the functionality of your bike's crank system with VANSIHO.· Quality Materials: Crafted with durability in mind, these crank bearings are made from high-quality materials to withstand the demands of cycling. Enjoy a long-lasting and reliable solution for your bicycle crank.· BMX Cranks Performance: Elevate your BMX cranks' performance with VANSIHO Crank Bearings. The 5/16" ball size and 7/9 balls ensure optimal functionality, providing a smooth and efficient riding experience.