Introduction
This guide will show you how to change a BMX sprocket on a BMX bike with pegs, step by step. Sometimes, a sprocket tooth will break, or you want to try a new BMX sprocket, so this guide will help you change that sprocket easily at home.
The sprocket is a component of the bike that looks like a star and it's located by the pedals spinning the chain as it is being pulled to make the back wheel spin to make the bike move. If the sprocket is damaged or broken, it can cause the chain to skip and potentially break out of nowhere, leading to an accident.
The only tool that will be needed is a 17mm socket, an extension, a ratchet, 2 Allen keys (one that fits the big compression bolt and a smaller one to fit the faller compression bolt), your bike, and the new sprocket that will be installed to the bike. Some hazards with this fix are the fact that your finger can get caught between the chain and the sprocket or the back wheel, so it is essential to make sure that your fingers are not in a position where they can get dragged into the teeth of the sprocket or caught in the back wheel.
What you need
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Flip the bike upside down in a position where the back wheel can spin freely.
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Gather your tools.
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Get a ratchet, socket, extension and connect the extension to the socket and the ratchet to the extension.
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Insert the socket with the extension in the peg till it hits the end.
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Loosen the nut inside the peg.
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Repeat these steps for the other side.
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Grab the chain
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Slightly pull the chain to the side, away and back from the wheel
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Make sure that it isn't attached to the wheel driver (spikes that chain sits on normally to make bike wheel move)
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Grab the chain by the sprocket on the bottom of the bike
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Pick it up and slightly pull to the side to remove the chain from the sprocket
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Spin bike cranks to create clearance to move chain away from the sprocket and off the cranks
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Grab the Allen key that fits the compression bold
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Loosen the compression bold
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Completely remove the compression bold from the cranks
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Use the Allen key that fits the smaller bolt to loosen the cranks.
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Loosen the bolt on the cranks.
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Pull crank with the sprocket off the crank spindle.
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Loosen the bolt that is holding sprocket (optional depending if cranks have the bolt).
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Remove the sprocket from crank.
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Place the new sprocket on the cranks with the corresponding hole to hold the sprocket still.
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Tighten the bolt to keep the sprocket in place (optional depending on bike cranks).
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Push the cranks back onto the crank spindle still it stops moving and the other crank isn't pushed out.
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Thread in the crank compression bolt by hand on the cranks.
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Use the Allen wrench to tighten the compression bolt and compress the crank and the crank spindle together.
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Use the Allen key to tighten the smaller compression bolt and prevent the cranks from spinning.
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Spin the crank with the sprocket to the position where the pedal is close to the peg.
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Grab the chain.
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Hover over the pedal to where you can place the chain back onto the sprocket.
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Make sure that the chain is placed correctly on the sprocket.
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Place the chain back on the the wheel drive on the back wheel.
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Spin the back wheel backwards so the chain can get rotation and sit correctly on the driver.
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Pull the back wheel till it stops moving.
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Align the wheel so it wont hit either side of the frame.
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Use the socket with ratchet and the extension to tighten the nut inside the peg slightly, which will allow the wheel to move slightly if needed.
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Do the same thing on the other side.
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Once the wheel is aligned, tighten one side slightly and then tighten the other side slightly as well.
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Keep doing this process until the nuts are tightened enough to they won't move without the use of the ratchet.
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The new bike sprocket will be installed if bike sprocket was broken or wanted a new one
Team
CSU Los Angeles, Team H-99, Briggs Spring 2023 Member of CSU Los Angeles, Team H-99, Briggs Spring 2023
CSULA-BRIGGS-S23SHG99
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