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Old 10-22-09, 08:57 AM   #1
robncircus 
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Is it ok to break a chain twice?

Here is my dilemma. I'm doing my first DIY build and am currently working on the drivetrain. I am foolish, and put the chain on prior to setting the deraileur limits on both fron or rear. Now I'm paying the price and can't get it tuned correctly. I want to take the chain back off to set the limits properly so I can have a full range of gears. The chain is a Shimano Dura-Ace Narrow 10 speed with those funky extra pins they provide. Will I be ok breaking the chain again? Or, any suggestions to set the limiting screws witht he chain on?

Thanks

Rob
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Old 10-22-09, 09:05 AM   #2
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Originally Posted by robncircus View Post
Here is my dilemma. I'm doing my first DIY build and am currently working on the drivetrain. I am foolish, and put the chain on prior to setting the deraileur limits on both fron or rear. Now I'm paying the price and can't get it tuned correctly. I want to take the chain back off to set the limits properly so I can have a full range of gears. The chain is a Shimano Dura-Ace Narrow 10 speed with those funky extra pins they provide. Will I be ok breaking the chain again? Or, any suggestions to set the limiting screws witht he chain on?

Thanks

Rob
First off you can set the limit screws with the chain on, you don't need it off to do it, there are much more knowledgable people here who can provide better tips than me so I'll leave that to them. But that said, head to your LBS and get a removeable master link for the chain, break it again and use that to hook it back up, this way you can remove the chain whenever you want. They are about 5-10 bucks.
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Old 10-22-09, 09:13 AM   #3
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I'm not sure how you'd accurately set the limits without the chain in place.
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Old 10-22-09, 09:17 AM   #4
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Yeah, you should set the limits with the chain on. How else will you know if the limits are correct?

The chain can be broken more than once. That's why it comes with an extra pin. When breaking it a 2nd time, make sure you don't remove the original connecting pin. Just use one of the other 100+ pins.
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Old 10-22-09, 09:19 AM   #5
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Chains can be brokenmore than once... just not in the same place! Make sure when you break your chain that the pin you push out is not one of the replacement pins.

BUT! Do not break your chain to set limits - it is completely unnecessary and probable results in a less precisely adjusted system than if you were to have left the chain on!

Follow the instructions on the Park Tool website:

Rear Derailleur
Front Derailleur

If you follow all the steps therein and you are still ahving trouble, you may have a misalighned derailleur hanger or some other problem. Let us know how it goes!
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Old 10-22-09, 09:31 AM   #6
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Thanks for the responses. I was following the 7800 instruction packet and I noticed they make no mention of adding a chain until after the limits are set. My issues surround getting the chain into the 25T cog on the rear. It just won't go all the way over. I htink the pulley wheels are in the way preventing the deraileur from going far enough. Maybe the chain is a link too long? I consider myself mechanically inclined but bike work has always ruined me hah.

Cheers

Rob
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Old 10-22-09, 09:39 AM   #7
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Check your b-limit screw
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Old 10-22-09, 09:49 AM   #8
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Park tool article on Chain length sizing
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Old 10-22-09, 09:58 AM   #9
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It's easier to set the rear high limit with the chain off, but it can be done. It's no problem to set the rear high and it's necessary to have the chain on for the front.
I would get a master link so that removing the chain to clean it will be easier.
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Old 10-22-09, 01:29 PM   #10
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It sounds as if the cable was not all the way out of the shifter when the cable was attached to the deralleur. You need to work the small shift lever several times before attaching the cable.

Al
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Old 10-22-09, 07:36 PM   #11
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If limit screws could only be adjusted with chains off we'd be charging extra for every tune up for replacement pins (except sram chains).
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Old 10-22-09, 07:40 PM   #12
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Chainpunch anyone???
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