Skorpion Sprockets

[Mike G]

I am buying a blank 43 teeth rear sprocket in New Zealand for my skorpion sport and machining the bore, bolt holes and lightening holes. I would like to do this before removing the old sprocket but need to check the dimensions. Is the JT sprocket drawing accurate for centre bore and pitch circle? Does anyone know the tolerance on the 90mm diameter centre bore? I am guessing 90.10 to 90.20 would be good enough?

Thanks.

Mike G