Should I install chain or derailleur first?

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Should I install chain or derailleur first?
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flag EKrum
O+
Posted: Nov 11, 2014 at 14:45 Quote
I am moving from 2x10 to 1x10. I have a new dérailleur and chain. Should I set up the deraileur before I install the chain?
flag Gabber
Posted: Nov 12, 2014 at 3:20 Quote
Before I install the chain I watch from behind whether the dérailleur sits straight under the smallest cog. You can adjust it by turning the high limit screw. Then I install the chain and tighten the tension of the cable. After this I install the chain and shift to the biggest cog. Again check whether it sits straight under the cog. But I think it doesn´t matter if you install the chain from the beginning or not. I don´t do it, because so I can see it better how it sits under the smallest cog. Other say it is better with the installed chain, as they don´t watch he dérailleur , they watch how the chain runs on the smallest cog.. I would say check how it´s better for you. Watch either the sit of the dérailleur or check how the chain rides on the smallest cog.
flag TwoWheelMike
O+
Posted: Nov 13, 2014 at 20:20 Quote
I usually check limit screw adjustment on the derailleur before installing the chain or anchoring the cable. Once that is set I install the chain, and run through remainder of derailleur setup. Honestly though you could do whatever you want. I've done hot swaps of rear derailleurs before too, meaning that I yanked out the lower pulley on the old (usually wrecked) derailleur to slide the chain out and installed the new one in opposite order. It still works the same, and in this case since I don't need a new chain it saves me a lot of time.
flag ajax-ripper
Posted: Nov 13, 2014 at 20:39 Quote
To properly set up the derailleur you will need the chain installed.
flag t3rry
Mod
Posted: Nov 18, 2014 at 21:10 Quote
I would install the derailleur first, then you can feed the chain through the derailleur before putting the change together. Otherwise you install the chain, then you need to take apart the derailleur and set it up around the chain. Then once you have the chain and derailleur on, you then set up the derailleur.
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