About Chain Reaction Cycles Chain Reaction Cycles is the largest online bike store in the world, specialising in a vast range of bikes, bike components and parts. Whether you’re looking for a road bike, mountain bike, BMX, Hard Tail bike, suspension bike or triathlon gear it’s all available at Chain Reaction Cycles, along with professional advice and something to suit every budget. They stock top brands such as Shimano, SRAM & Avid, KONA, Cube, Vitus, Nukeproof, Corratec, Fuji & Giant. Chain Reaction’s ethos of selling high quality brands at the best value prices also extends to its stock of clothing and footwear. Looking for Asics, Adidas, Nike, Saucony to clothing brands such as Endura, Skins, Cannondale, Castelli & Troy Lee Designs? Then visit their website for your cycling, triathlon, running and clothing needs.