In yesterday's post I wrote that you can align the rear cog and the chain ring by sighting down the two sprockets before you put the on the chain. This will get you close to alignment. Once you have an approximate alignment you can easily fine tune it using the following technique.
Put the chain on the bike and spin the crank several times. Then notice the position of the two sprockets teeth in the chain. If the chain ring and the cog are properly aligned then their teeth should be in the middle of the chain. If the teeth on the cog are on one side of the chain and the teeth of the chain ring are on the other side of the chain then the sprockets are misaligned. If this is the case, slip the rear cog over in the direction that would move it's teeth to the center of the chain. This is very easy using spacers on the freewheel.
Now spin the chain a few times and recheck the location of the teeth. Keep moving the rear cog until the chain is always centered on both sprockets after spinning the crank. Now you have alignment. Remember that a well aligned chain has the least amount of friction so spend a little time to get this right. Good alignment also minimizes the chances of a chain derailing.
Good Luck,
Mike
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