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Not  a single speed I know but the 8 speed internal hub gears are smooth, quiet and no maintainence.

Frame: Charge Mixer - Tange 700c - Tange Infinity tube
Size: X Sml - Sml - Med - Lge
Colour: Black
Fork: Tange Mixer Cromoly
Brakes: Shimano BR-M486 hydraulic disc
Levers: Shimano Hydraulic
Headset: TH 857- 1-1/8'' Forged Alloy
Stem: 3D forged alloy - W/ Laser charge logo
Handle bar: Charge Flat Bar Silver
Grips: Plunger MTB
Shift Levers: Alfine Rapidfire SLS500(Right only)
Front Derailleur: -
Rear Derailleur: -
Chain Wheel: Alfine 39T alloy - Small: 170mm - Med & Large:175mm
Crankset: Alfine Hollow Tech II 2 pc
Cassette: Alfine 18t cog.
Pedal: Wellgo LUC-27G
BB: Alloy 6061 T6. Eccentric BB - 68mm
Rims: Alex DP17 700c - ANOD. W/SSE - 14Gx36H Black
Tires: Continental Sport Contact 700c x 32c A/V
Front Hub: Shimano HB-M495 Centerlock disc hub
Rear Hub: Shimano Alfine SG-S500 internal 8 speed - Centerlock disc hub
Saddle: Charge Spoon - Black
Seatpost: Alloy - Black
Seat Clamp: Alloy Single bolt