Park Tool Bbt-49.3 Bottom Bracket Tool 16-notch 39mm

Aluminium - Corrosion resistant lightweight metal

Shimano - A high end bike part manufacturer

Diameter - A measurement across a circle passing through the middle

Torque - Torque is a measure of the turning force of an object. Such as a wrench turning a bolt, the higher the toque the higher the capability of undoing a tight bolt.

40mm - The equivilent of 4cm

Torque - The force used to turn, rotate, an object about an axis. The higher the torque the greater the ability to turn.

Cyclestore is a leading online cycle retailer, selling a large range of bicycles, bike accessories, components and clothing, together with camping and hiking equipment and ski and snowboard accessories. Cyclestore brings over 20 years shop trading experience to its online store, and the knowledgeable and helpful staff are able to answer technical queries relating to all bikes and equipment. The range of bicycles includes mountain bikes including full suspension and hard tail mountain bikes, road bikes with light, streamlined designs for fast speeds, sports hybrid bikes, comfort and leisure bikes, BMX bikes, folding bikes and touring bikes, with brands including top names such as Kona, Mongoose, Raleigh, Specialised, Giant, Carrera, Dahon and Dawes. The large range of bike accessories includes bags and panniers, bells and mirrors, bottles and hydration packs, helmets, lights, locks, cleaning accessories and pumps. Personal accessories include cycle shoes, sunglasses, reflective and safety wear and body armour.