Specifications Hign-concerned Chemical:None Type:MTB Bike Hubs Size:135mm Number of Holes:32 holes Axle:qr Freehub:HG Position:REAR Braking System:Disc Brake Spoke Hole:29 - 36 Material:Aluminum alloy Category:Bearing Hub Hub Hole Number:32 holes Description of X150: Excellent sound quality and performance: These X150 mountain bike hubs are designed for riders who crave thrilling experiences. With a large sound hub design, you will enjoy a powerful, high-performance riding experience. Precision ratchet mechanism: These hubs feature 6 ratchets and 3 teeth, ensuring quick engagement and smooth power transmission, making them an ideal choice for demanding mountain bike adventures. Durable and versatile: The hubs come with 150 engagement points and offer options for 28, 32, or 36 holes, catering to various wheel setups. Sealed bearings enhance their durability and resistance to harsh conditions. 8-12 speed compatibility: These hubs are designed for versatility, supporting 8 to 12-speed drivetrains, allowing you to adapt flexibly to different riding conditions and terrains. Effortless riding: The smooth operation of the hubs ensures a seamless and enjoyable riding experience. Whether conquering challenging trails or cruising on flat roads, these hubs will not disappoint you.