Mountain Bike Chain Too Short. Chains will also "stretch" over time, but do not shorten the chain to address this issue. Then you will have a chain a few links shorter then original unshortened chain.
With front centers getting longer and longer, and mine are plenty long, a short chain stay keeps the overall wheel base reasonable. What I would suggest is splicing the left over links into the chain first. With it, you can remove the studs or bolts from the chain links or press them in again when you are finished.
Like I said, it isn't a problem on my bike because I am used to it and know not to go big-big or bad things will happen.
On mountain-bike-type shifters, this will be located at the shifter itself, just where the cable exits..
Pull the two ends together and add one complete link (one inner and one outer half link) to get the correct chain length. I think the shorter chain helps more with cage tension on the small front chainring. If the chain is too short, this shift is difficult to make and the derailleur cage is stretched out and almost parallel to the chainstay.