Chains for Single-Speed or Hub-Gear Drivetrains
Moruya Bicycles stocks the SRAM PC1 nickel plated 1/8" chain for single speed and internal hub-geared bikes. Single Speed Mountain Bikes will generally use a 3/32" chain (definitely if it's a conversion from a geared mountain bike) and so the chain to use is one compatible with the number of gears the bike started with, since that's what the chainrings and cassette sprockets will need.