Should there be a gap between crank and bottom bracket?

No you don’t need a spacer – the axle does all the load bearing by itself.

Do all cranksets fit all bottom brackets?

In general terms, most cranksets can be fitted to a variety of bottom bracket shells, though much of this compatibility depends upon the availability of suitable hardware (see next section). Any incompatibilities that do arise are often related to the length and/or diameter of the crank axle.

Are cranksets universal?

Many chainrings are not compatible across different brands or even across different models for any given brand. Cranksets attach to a frame via bottom bracket, and there are many different types of bottom brackets.

How do I use the bottom bracket tool?

Begin by removing both cranks. Inspect the threaded cups for tool fittings. There are many different designs and tool options. See Bottom Bracket Tool Selection: Threaded and Thread-Together to determine the correct tool. Insert the tool fully and remove the non-drive (left-side) cup by turning counterclockwise, holding the tool firmly to the cup.

What is a crank on a bike?

Cranks are levers that connect the pedals to the bottom bracket spindle. The cranks are fitted with toothed sprockets called chainrings that drive the chain. Cranks may be removed to replace cranks or chainrings, service the bottom bracket bearings, or to clean the chainrings.

What are the parts of a 3 piece crankset?

The common three piece crankset has left and right arms with the bearing and spindle integrated. The common threading for bottom bracket shells is called “English.” The left-side cup is a right-hand thread direction, which tightens clockwise and removes counterclockwise.

How do you identify a crank system?

Identifying Your Crank System. Cranks are levers that connect the pedals to the bottom bracket spindle. The cranks are fitted with toothed sprockets called chainrings that drive the chain.