Usage Tips:Description: [High Strength]: The bearing of wheel hub axle corresponds to the front and rear wheels, not universal, please choose the correct hub, the front solid shaft distance is 12.5cm/4.92inch and the rear solid shaft distance is 17.5cm/6.89inch. [Material]: This wheel hub axle is made of steel material, firm, durable and long service life. Precision machining, high strength and not easy to break. [Simple Installation]: The cycle wheel hub axle is easy to install and disassemble, you can quickly replace or disassemble, easy to use and bring more convenience to your . [Lightweight] : This cycle wheel hub axle is Ultralight, adding no heaviness to training or long time riding and is suitable for long term cycling. [Application]: Bearing wheel hub axle is suitable for mountain bikes, and road bikes, convenient and durable. Specification: Material: steel Size Chart: front axle: 12.5cm/4.92inch rear axle: 17.5cm/6.89inch Package Includes: 1 Bike Bearing Parts Note: Please allow slightly errors due to manual measurement and different monitors.