Self-extracting system with hole fitting in retaining cap. This crank also acts as the bottom bracket bearing axle.
One piece of steel forms the crank arms and goes from the pedal, through the bottom bracket, to the other pedal. The process of servicing these cranksets is slightly different than standard three-piece cranksets. Many BMX and freestyle bicycles use a unique crank system that utilizes a 48 spline spindle. Three piece cranksets generally have one of two interfaces: square spindle arms or splined spindle arms. Both left and right cranks will have crank bolts in the arms. Specialized Bicycle Components Recalls Bicycles with Stout Cranks Due to Fall and Injury Hazardsīoth cranks must be removed to service or replace the bearings of a three-piece system. The spindle is held in position by bearings in the frame. The parts of the three-piece crankset are the left arm, right arm, and axle spindle. This washer is used to account for variations in frame shell widths and effectively acts as the bearing adjustment. Instead, the bearings are mounted onto the cranks. With this system, both the left and right crank arms are fitted with one-half of the spindle system, with teeth machined into each spindle end. The left side crank is removed to get to the bearings or to remove the right crank. These systems use external bearing cups and do not need a conventional crank puller. These have a left crank arm with a compression slot that is secured by two pinch bolts and a right crank arm with an integrated spindle.
Self-extracting systems exist in both two-piece and three-piece form. No additional crank removal tools are required.
However, these crank retaining rings are threaded over the crank bolt, so that when the crank bolt is loosened the shoulder of the bolt presses back against the ring, which in turn slowly pushes the arm from the spindle. Self-extracting systems use threaded rings that look similar to a crank dust cap. On self-extracting crank systems, the crank puller is effectively built into the crank. To know the service options you will need to know the type of crank and type of bottom bracket bearing system installed in the bicycle. Cranks may be removed to replace cranks or chainrings, service the bottom bracket bearings, or to clean the chainrings.Ĭrank systems have become more complex in recent years. The cranks are fitted with toothed sprockets called chainrings that drive the chain. Cranks are levers that connect the pedals to the bottom bracket spindle.
SPECIALIZED FACT CARBON CRANKSET REMOVAL FULL
This article will assist in identifying the crank system found on your bike, and direct you to the article that outlines the full process of removal and installation.
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