RX3 rear sprocket teeth available? Compatible to?

[NzBrakelathes]

I was looking at the options of teeth count for the RX3 - what is the current easy available apart from stock? is stock what people want/need or would other smaller and bigger be an item people would like?

Seems custom rear sprockets are available in China if you are willing to wait and spend the money (5 times more expensive then the stock sprocket)

I am more talking about the unit with cushy drive - I have seen the non cushy drive offered but doubt many folk have that version.

I spotted the following tooth counts:
39
41
44
47
49
52
60
70
Some are isted as "stunt" maybe not for common use on an RX3 lol but they offer custom specs too.