The recommended size of the chain to use with a small sprocket is typically a smaller chain size to ensure proper fit and function.
Sprocket size will b 16T & 39
The chain is size 530, and the stock gearing is 15/45, meaning that the front sprocket has 15 teeth and the rear sprocket has 45 teeth.
chain: 525 , sprockets: 16/43
15 and 45
with a standard 17t front sprocket and a 42t rear sprocket the standard chain size is a 525 ( x-ring or O-ring) 124 link.
120 chain link
The chain length needed is determined by chainring size, sprocket size and the design of your frame. There's no way of saying that you'll need from the sprocket alone. On top of that there isn't much to choose from when it comes to half links. They are all of the same length and in width there are two options 1/8" or 3/32". You need one the same width of your chain.
The recommended chain size for a single speed bike is typically 1/8 inch.
You might have to either lengthen or shorten the chain, depending on if you're getting a bigger or smaller sprocket.
14t on front. 40t on back
17 tooth front, 42 tooth rear, 110 link chain, size 530
It's 1/8" width, but the length is determined by the size of the bike frame, and the size of the sprocket/chainwheel you're using.