![]() With Hollowtech II cranks, for example, the non-drive side crank is secured to the spindle by means of a pinch bolt at the end of the crank arm, and a shallow crank bolt which is also known as a ‘preload cap’ (you may need a special tool to remove this). The means of securing the non-drive side crank to the spindle will further vary according to manufacturer and standard. External and press-fit crankset/BB systems (such as Shimano Hollowtech II, RaceFace X-type, FSA MegaExo or BB30) feature the BB spindle permanently attached to the drive side chainrings and crank, which are an integrated unit.They can be broadly divided into two categories – those where the spindle is an integral part of the drive side of the chainset (such as those used with external-bearing and press-fit BB systems) and those where the spindle and BB are one unit (square-taper, Octalink or ISIS BB standards as well as three-piece BMX cranks). ![]() However, there is a huge variety in the range of crankset and BB standards on the market, so you will need to ensure that your crank bolts match. If retightening the crank bolts doesn’t work, you may need to replace with new ones. Signs of this may include a tell-tale creaking noise from the BB area, or ‘play’ in the crank arms when moved from side to side by hand. While they are another of those parts that may go largely unnoticed by most riders – sometimes they are even covered by a dust cap – they may become loose and worn over time and require replacement. ![]() Crank bolts, as the name suggests, are used to secure the crank to the axle (spindle) of the bottom bracket(BB). ![]()
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January 2023
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