Chain Reaction Cycles is an online store specialising in mountain bike components, including drivetrains, frames and forks, wheels, brakes, controls, clothing and protection, and accessories. Chain Reaction Cycles Mountain Bikes , Bike Parts , Bicycles - Top cycling brands , Shimano , Mavic , Maxxis , Campagnolo , Oakley , Cube , Rockshox , Marzocchi , Sram , Formula ... Suspension Wheels Tyres Bikes Shoes Hardtails Cranksets Full Suspension