Features 1、The inner width of the front fork that is suitable for opening before 0.L.D is opened is 100mm/3.9in. 2、After the O.L.D is opened, the inner width of the applied gear is 135mm/5.3in, and the center distance of the disc to the hole is 44mm/1.7in. 3、In all conditions and situations, a bicycle with a good drum sound can ride faster than a bicycle with a bad drum sound, which can increase the riding speed. 4、It is an important part of bicycles, and the average speed of riding a bicycle is directly affected by the quality of the hub. 5、The bicycle hub is made of high‑quality and durable aluminum alloy material, and the bicycle hub acts as a connection between the spokes and the axle. Item Type: Bike 32 Hole Disc Brake Flower Drum Material: Aluminum Alloy Colour: Black Number of Holes: 32 Holes Weight: Approx.904g/31.9oz Product Size: Front Hub Axle Length: Approx. 110x70mm/4.3x2.8in Rear Hub Axle Length: Approx. 150x70mm/5.9x2.8in Center Distance of Disc to Hole: Approx. 44mm/1.7in The Inner Width of the Front Fork That is Suitable for Opening Before O.L.D is Opened: Approx. 100mm/3.9in After O.L.D is Opened, the Inner Width of the Rear Fork is Suitable for Opening: Approx. 135mm/5.3in Package List 2 x Bicycle Hub 1 x Long Release Rod 1 x Short Release Rod