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@mtbfixie
mtb bcd is most commonly 104mm, for my commute i use 34-15 which on26" wheels i think gives about 60 gear inches. off-road i use a 17t sprocket giving me 53.6gi. standard otp mtb singlespeeds use a 2-1 ratio so thats as good a place as any to start! hope that helps, or have you built it already?