Available with a huge choice of 14mm female bolts or 10mm bolts with a 9t driver - Select your drive side and Colour and then select your Slack ring and bolts at the Checkout!. Titanium driver Upgrades also available at checkout! Hand Made in the USA! The Z-coaster has been designed from the ground up by Profile to be the most versatile and reliable Freecoaster hub. The hub can be used as either a Freecoaster or regular cassette hub bu simply switching the Slack-Cam ring inside the hub. The Shell is machined from 6061 aluminium and features a Crmo centre female axle with choice of 10mm or 14mm bolts (Titanium upgrades available at Checkout). The Z coaster features a unique Driver which uses Z shape pawls which allows 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. Finished in super deep anodised colours. ###section### Product Specs HUB TYPE: Cassette / Coaster Switchable AXLE: Female Bolts DRIVER: Choose In Basket SPOKE HOLES: 36h WEIGHT: 559g / 19.7oz