With respect to rear sprockets
P180 is 43
Unicorn's is 43
Duke is 43
I guess the 200 NS sprocket is 14/39 and the R15s V1 is 14/42 and regarding holes try drilling holes if you can, most people have tried using custom sprockets, meaning drilled by themselves.
I have one weak memory as to the holes, but you can check with an R15 nearby.

Cheers!
VJ


, So any ideas for replacement chain-sprocket
.

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