With a new lightweight bearing & axle system, the reliability and performance you trust with Shimano hubs keep rolling with the updated Deore hub. Deore hubs have been redesigned to provide all-weather durability and reliable performance thanks to high quality sealings and angular contact bearings. Product features Use: MTB Group: Deore Model: HB-M618-B Spoke hole: 32h Brake type: Center Lock Disc P.C.D.: 44mm Flange diameter: 52,8mm Hub: Labyrinth and contact seals Type: Quick Release Axle diameter: E-Thru 15mm Axle length: 110mm Material Hub: Aluminum Anodized Axle: Steel Color black Scope of delivery DORE Front hub HB-M618-B E-Thru 15mm Centerlock 32 Holes Technologies Cup & Cone Bearing Angular contact bearings of the cup & cone type offer greater strength than sealed cartridge industrial bearings due their ability to displace lateral and vertical loads more effectively for super smooth rotation and longer durability. Angular contact bearings also allow easier maintenance, adjustability and serviceability. Center Lock System The CENTER LOCK system makes an easy rotor installation possible with spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency.Shimano