I have a Huffy Cruiser. When I brought it, it was a seven speed. Now it is a ten speed, with two sprockets in the front (53 & 40) and five in the back (14 to 28). Now it is time to replace my chain. I am asking someone with experience in such matters: would it be acceptable to get a replacement chain with the same kind or would I be better off with a chain designed for a five speed? I do have problems adjusting the shifting. I either have correct chain stop for the large gear and not the small one or the reverse. Since I have the shifting levers that do not click, I just do it by feel. While I am thinking about it, since I went from a 46 teeth front crank to a 52/40, should I get a longer chain? Any advice would be appreciated.

Chains are normally supplied longer than needed, so the can be shortened to the correct length.

Have a look a the Park Tools site https://www.parktool.com/blog/repair-...-length-sizing for how to.

When the chain is the correct length, all gears should be usable.

chains vary in width, but 5s and 6s chains are the same. 7s and 8s chains are a bit narrower but will still work fine. 9s and more will not only cost you more, but will be a bit too narrow causing problems like getting caught between the chainrings,

As JMC said, your chain will be too long in the box and you'll need a chain too to cut it to length. If you buy a 5s or 6s chain (if you can find one) odds are it'll be of a construction where you can both cut and splice it with the chain tool. These chains are recognized by pins that protrude about 1/32" beyond the plate surface. 7s and more chains will probably have pins that are almost flush with the outer plates, and must be spliced with a connecting link or special pin.

5 and 6 speed chain: https://www.niagaracycle.com/product_...oducts_id=2461

buy a KMC Z51 chain (should be $10-$15) plus a chain tool (or a multitool with chain breaker) and grab a few extra kmc links while you're at it ;-)