Profile's Z Coaster Hub is a proprietary freecoaster style hub engineered and designed to work as a spring/pawl cassette that can be disengaged into a freecoaster. The Z-coaster has been designed from the ground up by Profile to be the most versatile and reliable Freecoaster hub, with a Shell that's machined from 6061 aluminium and features a hollow 14mm Crmo Axle for maximum strength and durability. It features a unique Driver which uses Z shape pawls allowing for adjustment from 1/8 of a crank to 1/3 of a crank by changing the Slack Cam ring. The driver is also supported from the outside by a huge bearing making this hub ultra reliable and maintenance free. Please note: The Z Coaster Hub is sold standard with a 14mm Hollow Male Axle (You can Upgrade to Titanium at Checkout) and a 9t Driver! - Select your drive side and Colour and then select your Slack ring at checkout. ###section### Product Specs HUB TYPE: Cassette/Coaster Switchable AXLE: 14mm Male DRIVER: Choose In Basket DRIVE SIDE: Left Side Drive SPOKE HOLES: 36h WEIGHT: 500g (1.1lbs) Colour: Blue, Black, Polished, Matt Black, Purple, Red, Gold, White, Green; Size: LHD