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@gizmond
Calcs on the Herne Hill site are all based on 'standard' 27" wheels, not whatever tyre combo you have.
Trackies all talk based on (Chainring X Cog) / 27, helps to keep things standard(ish)
So 46x14 is a nominal 88.7
Probably a bit big if you are just starting out.
48x15 for 86.4 is probably a better place to start, or even 47x15 for 84.6