A rachet includes a round equipment or a linear rack with tooth, and a pivoting, spring-loaded finger referred to as a pawl that engages one’s teeth. The teeth are uniform but asymmetrical, with each tooth having a modest slope on one edge and a very much steeper slope on the different edge.
When one’s teeth are moving in the unrestricted (i.e. forward) way, the pawl conveniently slides up and over the delicately sloped edges of one’s teeth, with a springtime forcing it (typically with an audible ‘just click’) into the depression between your teeth since it passes the suggestion 
of each tooth. When the teeth move in the opposite (backward) direction, however, the pawl will catch against the steeply sloped border of the primary tooth it encounters, thus locking it against the tooth and stopping any further motion for the reason that direction.
Backlash
Because the ratchet can only stop backward motion at discrete tips (i.e., at tooth boundaries), a ratchet does let a restricted amount of backward action. This backward motion-which is limited to a maximum distance equal to the spacing between the teeth-is called backlash. Where backlash should be minimized, a simple, toothless ratchet with a higher friction Ratchets Wheel surface such as rubber is sometimes applied. The pawl bears against the surface at an angle so that any backward movement may cause the pawl to jam against the surface and therefore prevent any further backward motion. Because the backward travel range is generally a function of the compressibility of the great friction surface, this mechanism can cause significantly reduced backlash.
This Ever-power 54t Ratchet kit works as a primary replacement and is super easy to install. Just take away the freehub human body the parts you observe here will maintain there, grease up the new parts and re-assemble the hub. Boom! You’ve just significantly increased the engagement items on your hub. To give you a better idea of how this improves your ride think about the engagements in examples of a circle, with the 18t you need to maneuver the cassette 20 degrees to attain another engagement and with the 54t that knocks it right down to 6.66 degrees! That’s significantly less than a 3rd the distance it needs to move to hit another tooth! You could be wondering when you can really see the difference. Just pedal your cycle around and keep carefully the bike moving by using tiny pedal strokes and back-pedaling. You will see there’s going to be lot’s of slop between engagements. Visualize if that “slop” was cut down to a third! I’m sure imaginable that is clearly a huge upgrade. And so, if you weren’t already completely convinced on the 54t ratchet kit I hope this can be the turning indicate getting one!