While breaking the chain, I pushed the pin too far and pushed it out completely. Now the chain is too short. How do I re-insert this pin, or should I look for other options.


What type of chain - Shimano have chain connector pins for exactly this task for many of their chains. Note the pin must exactly match the chain. If you have a length of the same chain (I always keep the left overs when I put ion a new chain) break the chain again and remake the chain with the leftovers.

I have (in desperation - bike shops 100km away, no spare chain parts), used a vice and pointy grips to do press the pin in - the repair was dodgy but got us on the road.

Alternately, use a quick link or a new chain.

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  • Chain is Shimano 105 10-speed. I didn't know you could purchase the break-apart pins separate from a new chain. Might be good to have a few of these spare. In the end I took links from an extra chain. Tried the dodgy operation, and lost the pin when it flew out of my pliers! – Phillip Ngan Aug 24 '14 at 22:56
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    Wipperman makes 10 speed quick links, which are probably most convenient. Splicing in another segment of chain is likely the easiest option since those shimano pin things are annoying. – Batman Aug 25 '14 at 1:27

I always carry the cutoff from a new chain (or a few links of it) in my kit. Take the chain apart at the next link down from where you lost the pin (being more careful this time) and then take two half-links from the cutoff and install them.

And, while you have that cutoff piece handy, do a trial to see how many turns of the crank it it is to take the pin almost all the way out, write down than number, and store it with the tool.

Or just use quick links.

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Easiest way to put the pin back?

Pull the link apart just enough to set the pin from the inside. Make sure one side is straight and tap it in with a hammer. Flip it over and tap the other side in.

Can do it in about 30 seconds and no hootin' and hollerin'

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In an emergency, you could always push out the pin of the next link (not fully, obiously) and reattach it where you removed the first pin. You'd lose a link (and possibly a gear) but you'd be able to ride home.

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  • In most cases, this results in a too short chain which can be dangerous (hence emergency only). In most cases, however, the other answers are much better options. In any case, if you have a little saddle bag, a few spare links isnt a bad thing to have on hand (or a few quick links). – Batman Aug 25 '14 at 23:28

I just tackled one of these myself, so I thought I'd share my alternative experience.

I am short on tools, so in absence of a decent pair of pliers/hammer, I put the pin inside the inner chain to hold it in place and positioned it on top of one of the outer chain's legs (resting on the ground or an elevated surface). Note that this might require you to reposition/turn the outer chain's legs so that you can access the the hole from straight up. Then take a flat, metal surface (I used a dull bread knife) and place it on top of the pin positioned over the outer chain hole. The idea is just to apply a lot of pressure at as straight an angle as possible. Since it's a flat area you are applying force on, you can really put some muscle into it. For me, the pin slid in a bit within a few tries of repositioning.

From there on, as soon as it's a bit in, it's the traditional stuff.

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