Best Bike Bottom Brackets for Kids Bikes of 2026

The Jaceyon Bike Ball Crank Bearing Retainer is a durable and high-intensity steel ball bearing retainer designed to replace the crank bearings of your bike. With dimensions of 1.14 inches outer diameter, 0.7 inches inner diameter, and 1/4 inch ball diameter, this product is widely used for bike parts replacement and is suitable for kid's mountain bikes, children's bicycles, lowrider bikes, and stretch bicycles.

This Jaceyon Crank Bearing is a high-quality replacement part for your bike's crank bearing or bottom bracket. Made of durable steel with a stainless steel ball design, it provides a reliable and long-lasting performance. With an outer diameter of 1.46 inches, inner diameter of 0.94 inches, and ball diameter of 5/16 inch, please ensure it is suitable for your bicycle before purchasing. This versatile ball bearing is compatible with various types of bikes, including ordinary bicycles, mountain bikes, kids bicycles, and lowrider bikes. It offers smooth operation and helps improve the overall performance of your bike. Plus, with a satisfaction guarantee, you can trust that your purchase is protected. If you have any issues, the Jaceyon team will be happy to assist you within 24 hours.

The CustomyLife Bike Bearings come with four high-quality crank bearings, each featuring nine 1/4" balls. These bearings have an outer diameter of 29mm and an inner diameter of 17mm, ensuring a precise fit for your bicycle. Made from durable stainless steel, they resist rust and wear, providing long-lasting performance on every ride. You can easily replace your bike's axle wheel frame bearing, ensuring a smooth cycling experience. Regular checks and replacements of these bearings can enhance your bike's drivetrain efficiency, making them a great choice for any cycling enthusiast.

The VANSIHO Bike Crank Bearings are designed to give your bike’s crank system a smooth and reliable performance. With a 5/16" ball size and 7 to 9 balls, these bearings reduce friction for a more efficient ride, especially on BMX, beach cruisers, and stretch bikes. They fit well with BMX cranks, making them a versatile choice for different bike types. Made from high-quality materials, they’re built to last and handle the wear and tear of regular cycling. Using these bearings can help you enjoy a smoother, more enjoyable ride with less maintenance.

The Shimano BB-UN300 is a reliable bottom bracket designed for your bike. It features a hollow spindle, which is lighter and helps improve your bike's performance. The square taper JIS interface ensures a secure fit for your crank arms, enhancing stability during rides. Additionally, the bottom bracket shell has a standard inner diameter of 1.37 inches, making it compatible with various bike frames. Keep in mind that crankarm fixing bolts are sold separately, allowing you to choose the best option for your setup.

The Yinprwi Bike Ball Bearings come as a set of four high-quality steel retainers designed for bike crank bottom brackets. Each bearing features precise measurements—1.5 inches outer diameter, 0.94 inches inner diameter, and 8mm balls—ensuring a proper fit for your bike’s drivetrain. Made from durable steel, these bearings offer long-lasting strength and reliability, so you can count on smooth cycling performance. The set includes two pairs, giving you replacements and spares, which means you’re prepared for maintenance or quick repairs. These bearings are perfect for keeping your bicycle running smoothly, especially if you ride regularly or participate in races.

The Yinprwi Bike Bearing Set includes four high-quality steel ball bearing retainers, perfect for maintaining your bike's crank and bottom bracket. With an 8mm ball diameter and precise outer and inner measurements, these bearings fit securely into your bike's drivetrain, ensuring smooth rotation and efficient performance. The package offers two pairs, so you have replacements handy or a spare set for future needs. Made from durable steel, these bearings provide strength and long-lasting use. Regularly checking and replacing your bearings with this set helps keep your bike running smoothly, whether you're riding casually or preparing for a race.

The Jaceyon Bike Bearing Retainer is designed to replace the front wheel bearings on your bicycle, ensuring smooth and reliable wheel rotation. Made from durable steel, this bearing retainer offers long-lasting strength and high performance. Its precise dimensions (0.8-inch outer diameter, 0.5-inch inner diameter, and 3/16-inch ball diameter) help you confirm if it fits your bike, making installation easier and more accurate. The retainer works with various bike types, including mountain bikes, kids’ bikes, and lowriders, giving you versatile repair options to keep your ride in top shape.

The Lanturn Bicycle Crank Bearing package includes 4 pieces of 5/16" ball size x 7 balls bearing retainers. It is suitable for bicycle crank bottom brackets and can be used with mountain bikes, kids bicycles, lowrider bikes, children's bikes, and stretch bicycles. The bearing has an outside diameter of 1.46 inches/37.5mm and an inside diameter of 0.94 inches/24mm. It is an ideal replacement for your bike and comes with a satisfaction guarantee.