How to Measure a Bike Chain
Lay the original chain side by side next to your new chain.. Line up both chains.. Match the rivets on the chains.
Steps
Lay the original chain side by side next to your new chain.
Lay the original chain side by side next to your new chain.
Line up both chains.
Line up both chains.
Match the rivets on the chains.
Match the rivets on the chains.
Locate and mark where to cut on the new chain.
Locate and mark where to cut on the new chain.
Move the derailleur gears and wrap the new chain around the rear cog.
Move the derailleur gears and wrap the new chain around the rear cog.
Pull the bottom of the chain to the front chainring.
Pull the bottom of the chain to the front chainring.
Find the cutting point for the chain.
Find the cutting point for the chain.
Write down how many teeth the big chainring has.
Write down how many teeth the big chainring has.
Write down how many teeth the biggest sprocket at the rear has.
Write down how many teeth the biggest sprocket at the rear has.
Measure the length of the chainstay and multiply it by 2.
Measure the length of the chainstay and multiply it by 2.
Divide the number of teeth on the biggest chainring by 4.
Divide the number of teeth on the biggest chainring by 4.
Divide the number of teeth on the biggest rear sprocket by 4.
Divide the number of teeth on the biggest rear sprocket by 4.
Add your modified numbers plus 1 inch (2.5 cm) to get the chain length.
Add your modified numbers plus 1 inch (2.5 cm) to get the chain length.
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