text: Placing thin spacers under the bottom bracket's right-hand cup (Sturmey-Archer make a suitable 1/16" spacer) to move the chainring outboard
  Placing thin spacers between the chainring and its stack bolts to move it inboard (if the chainring is on the inside of the crank spider) or outboard (if the ring is on the outside of the spider)
  Placing thin spacers between the hub shoulder and the sprocket. This is recommended in the case of a freewheel-threaded hub, which has sufficiently deep threads for this operation.
  Usually, the rear hub is the best component on which to perform chainline adjustments, especially on threaded hubs. If a track hub is used, it is better to operate on the bottom bracket or - for minor shifts - on the crankset. The same occurs if a flip-flop hub is used, because the chainline should be the same in both sides (freewheel and fixed gear).
  Gear ratio
  Since fixed-gear bicycles do not have the capability to change gears on the fly, riders must choose their preferred gear ratio beforehand. A commonly used gear ratio that works well in most situations is 2.75:1, which can be implemented with a 44-tooth chainring and a 16-tooth rear sprocket.