Last updated Campagnolo crank spanner, used to tighten or loosen the bolt (15mm) which holds the crank to the bottom bracket spindle. Length is 17cm.
A peanut butter wrench, also known as a crank bolt spanner or a crank spanner, is a single-ended box wrench or ring spanner used in cycling to tighten older 14 mm and 15 mm crank bolts, or the wheel nuts (track nuts) on hubs with solid axles commonly found on track bicycles, particularly the 15mm wrench made by Campagnolo. This is the only one-piece wrench that can be used to tighten or loosen the bolt or nut which holds the crank to a square-taper bottom bracket spindle (although a thin-walled 15 mm socket and handle will also serve), whereas any wrench/spanner of the correct size will tighten or loosen wheel nuts.
A wrench or spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts—or keep them from turning.
Cycling, also called biking or bicycling, is the use of bicycles for transport, recreation, exercise or sport. People engaged in cycling are referred to as "cyclists", "bikers", or less commonly, as "bicyclists". Apart from two-wheeled bicycles, "cycling" also includes the riding of unicycles, tricycles, quadracycles, recumbent and similar human-powered vehicles (HPVs).
The crankset or chainset, is the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain or belt, which in turn drives the rear wheel. It consists of one or more sprockets, also called chainrings or chainwheels attached to the cranks, arms, or crankarms to which the pedals attach. It is connected to the rider by the pedals, to the bicycle frame by the bottom bracket, and to the rear sprocket, cassette or freewheel via the chain.
While Campagnolo produces the wrench most commonly associated with the name Peanut Butter Wrench, several other companies made, or continue to make, a similar product. These companies include:
Specialities T.A. (France) 2 known variations
Stronglight (France)
Park Tool (United States) Came in 14/15/16mm. Part number CCW14/15/16
Park Tool Company is an American designer, manufacturer and marketer of bicycle tools and equipment for both professional and home bicycle mechanics. It manufactures over 300 products that range from wheel truing stands to hex wrenches.
Sugino is a Japanese manufacturer of road and track bicycle components, founded in Nara, Japan, in 1910. It made a variety of cycling components, including cranksets and chainrings. After flagging in popularity due to Shimano's increased dominance of the Japanese bicycle component industry in the 1990s, the company has recently become more prominent, due to the rising popularity of fixed-gear bicycles and the cachet associated with the "Sugino 75" track racing equipment.
Additionally, there were several variations of the traditional Campagnolo version*.
Its name is derived from the fact that the wrench handle is reportedly a good size and shape to scoop peanut butter (a fairly cheap energy food for track cyclists) out of the jar.
Peanut butter is a food paste or spread made from ground dry-roasted peanuts. It often contains additional ingredients that modify the taste or texture, such as salt, sweeteners, or emulsifiers. Peanut butter is popular in many countries. The United States is a leading exporter of peanut butter and itself consumes $800 million of peanut butter annually.
Sheldon Brown was an American bicycle mechanic, technical expert and author. He contributed to print and online sources related to bicycling and bicycle mechanics, in particular the web site Sheldon Brown's Bicycle Technical Info. His knowledge of bicycles was described as "encyclopaedic" by The Times of London.
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