Originally Posted by
fietsbob
a bike shop can shorten the chain and put it on .. they do not come pre made to your needed length..
AW3 cogs are made in 1/8" & 3/32".. thickness from 13 to 21 teeth ..
the 16t + are dished/offset, 13-15 are flat.
they are low cost, (interchangeably, Shimano 3 speeds use the same cogs)
..
I could shorten a longer-than-standard chain myself but if I can order one with just a single extra link it would avoid effort and surplus chain wastage. As I suggested, the bike shop seemed unwilling to do this. I wanted to be sure there is only one pitch for all simple-bike chains. I don't know what profile the sprockets are but I'd guess they'll be bog-standard for a cheap bikes. If I end up having to do this work myself I'll measure the present chain's width and get the new one one to match.
The bike shop ought to have dealt with all this when asked to!