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Old 09-03-10, 12:53 AM   #1
clearcastle04
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Larger chain ring = How much longer chain?

Hi all,
I'm planning on going from a 52T chainring to a 60T on my folding bike (with no front derailleur to contend with) and my question is this; How much longer chain do you think I'll need. I'm pretty new to bike mechanics. My uneducated guess would be adding 4 more links cause there will be 8 more teeth but only half the chainring is actually "engaged" by the chain. Or is there other factors I'm missing. Or is this something to just play by ear?
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Old 09-03-10, 01:33 AM   #2
fietsbob 
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The Diameter increases too..

Due mileage/ wear,best to replace the chain anyway .
so get a new one and install it , rather than adding new links to an old chain.

and the stuff that the chain contacts will last longer if the chain is replaced ..
as worn chain wears cogs down quicker ..

Last edited by fietsbob; 09-03-10 at 09:05 AM.
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Old 09-03-10, 01:52 AM   #3
bjoerges
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New chains will almost always have a few extra links that can be removed to size the chain down to the right size. My guess would be 6 links more (4 more engaged + longer circumference) but that is pretty irrelevant. Use the same method for sizing the chain as you would with the 52t. Wrap chain around biggest rear sprocket, wrap around chainring (skipping RD), bring chain together, add one link, run it through the RD and connect the chain.

http://sheldonbrown.com/derailer-adjustment.html#chain
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Old 09-03-10, 07:37 AM   #4
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No need to guess, it should another 2 inches of chain. Each 4T is about an inch.
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Old 09-03-10, 09:24 AM   #5
clearcastle04
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Thanks all. Now time to go shopping.
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