A rachet includes a round equipment or a linear rack with tooth, and a pivoting, spring-loaded finger called a pawl that engages one’s teeth. The teeth will be uniform but asymmetrical, with each tooth having a modest slope using one edge and a very much steeper slope on the additional edge.
When the teeth are moving in the unrestricted (i.electronic. forward) direction, the pawl easily slides up and over the delicately sloped edges of the teeth, with a springtime forcing it (sometimes with an audible ‘just click’) in to the depression between your teeth as it passes the suggestion of every tooth. When the teeth move in the contrary (backward) direction, however, the pawl will capture against the steeply sloped border of the first tooth it encounters, thus locking it against the tooth and protecting against any further motion for the reason that direction.
Backlash
Because the ratchet can only just stop backward action at discrete factors (i.electronic., at tooth boundaries), a ratchet does let a restricted amount of backward motion. This backward motion-which is limited to a maximum range equal to the spacing between the teeth-is called backlash. Where backlash must be minimized, a simple, toothless ratchet with a high friction surface such as rubber is sometimes utilized. The pawl bears against the top at an angle so that any backward action will cause the pawl to jam against the top and thus prevent any further backward motion. Because 
the backward travel length is mostly a function of the compressibility of the large friction surface, this mechanism can result in significantly reduced backlash.
This Ever-power 54t Ratchet kit works as a primary replacement and is super simple to install. Just take away the freehub body the parts you observe here will be in there, grease up the new parts and re-assemble the hub. Boom! You’ve simply drastically increased the engagement tips on your hub. To provide you with a better notion of how this improves your ride think about the engagements in degrees of a circle, with the 18t you’ve got to move the cassette 20 degrees to reach another engagement and with the 54t that knocks it down to 6.66 degrees! That’s significantly less than a 3rd the distance it needs to move to hit the next tooth! You could be wondering if you can really see the difference. Simply pedal your cycle around and keep the bike moving by using small pedal strokes and back-pedaling. You will see Ratchets Wheel there’s going to become lot’s of slop between engagements. Visualize if that “slop” was decrease to a third! I’m sure you can imagine that is clearly a huge upgrade. Therefore, if you weren’t already completely convinced on the 54t ratchet package I hope this is actually the turning point to getting one!