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help me(10 posts)

help meWoof the dog
Dec 2, 2001 5:16 PM
hey, thought I'd ask a simple stupid question, because I hurt to think today: I run 12-23cassette, 53/39 chainrings. How many links in a chain should I have? Thanx.

Woof the dog....or is it Woof the God?
re: help meslow-ron
Dec 2, 2001 6:39 PM
doesn't this depend upon the lenght of your chain stays? if you have a long wheel base i would think that the chain needs to be longer than someone riding a 48 cm frame, no?

i'm sure i'll get slammed on this one if i'm wrong
re: help memclements
Dec 2, 2001 7:33 PM
Absolutely correct (it does depend on the frame geometry).

Assuming you have a "normal" bike, any chain you buy will be long enough. The question is how many links to remove.

I'm not sure whether there's any one formula to calculate this a priori. Obviously if you have the old chain you just make the new one the same length. If the old chain isn't available, I just thread a fresh chain onto the gears without closing the link, just holding the end links together with my hands, and look at the rear derailleur in the extreme gears (big / big, little / little) to determine what length of chain to use. Sort of non-scientific and requires some judgement looking at the rear derailleur, but it works.
booyahWoof the dog
Dec 2, 2001 10:27 PM
have my old chain, new chain measured as the old one, but I am not sure if the old one was just right to begin with. Its a 54 cm frame. I just cut off 6 links off of the new durace chain, and I use the rest with the powerlink on the bike. If you won't bother replying, I would understand.

Thank you.
Go hereDMoore
Dec 2, 2001 10:45 PM
This site has a chart where you can fill in your chainstay length, cogs, etc. to come up with the # of links for your chain. I've used it for years, it works great.
Thank you everyone.Woof the dog
Dec 2, 2001 11:02 PM
DMoore, you are my personal Jesus Christ.
Pardon mentioning His name

Go hereWoof the dog
Dec 2, 2001 11:13 PM
wait, I am not into math, which number would be a number of links? Thanx.
into english?dog lover
Dec 3, 2001 1:09 AM
Look at the bottom of the results page where it says
"Total number of links in chain (53/23, 420.0 mm chainstay): 106 links".

In this example the number of links is "106 links".
chain lengthmerckx56
Dec 3, 2001 7:22 AM
shift your r/d all the way down into the 12. run the chain thru the front and rear derailleurs and around the small ring and small cog. pull the chain so it just clears the bottom of the rear derailleur cage. make sure the big and small links line up correctly. no need to count or do any big b/s math problems. this way will work every time. once your break the small piece off, drop the chain down onto the bb shell (no this won't scratch it!) and use the hyperglide pin to connect the links. make sure the new link you've created is as free and loose as the others! it's the way i was taught and the way the otc does things!
Try this:nee Spoke Wrench
Dec 3, 2001 5:59 AM
Wrap your new chain around the big/big gear combination while completely bypassing the rear derailleur. Add 1" onto that length. (One inch is equal to one wide link and one narrow link.) That will give you the shortest chain that will safely work on your bike. If you try to use a chain that is any shorter, it can cause some seriously expensive problems if you ever accidentally try to shift into the big/big combination.

Actually, the Park Tool site has a wild math formula to determine optimum chain length, but I doubt anyone but the most anal engineering types ever use it.