Editing Single-speed bicycle (section)

==Vis-à-vis multi-speed bicycles==
[[File:Single-speed mountain bike.jpg|right|thumb|250px|A single-speed mountain bike. The frame was modified by replacing the rear drop-outs with track fork ends to allow the chain to be tensioned.]]

===Advantages===
A single-speed bicycle is generally cheaper, lighter, and mechanically simpler than its multi-geared equivalent. Without [[Derailleur gears|derailleurs]] or other gearing systems, there are fewer parts on the bicycle that require maintenance, making this type of cycle useful for city commuting in all weather. The drivetrain [[mechanical efficiency|efficiency]] of a single-speed can be greater than today's typical multi-geared bicycles. A straight [[chainline]], lack of chain drag from rear derailleur jockey pulleys, and lack of [[chainring]]s, ramps and pins all improve efficiency. As a single rear cog takes less space than the typical seven to twelve cogs present on most multi-geared rear cassettes, rear [[bicycle wheel|wheel]]s can be built with little or no [[bicycle wheel#Dish|dish]].

===Disadvantages===
As the single-speed bicycle lacks alternative gearing ratios, it is less versatile, as it cannot be pedaled efficiently outside of its single gearing range. Without lower gearing options, the single speed bicycle is generally more difficult to pedal uphill. Conversely, its dedicated gear ratio also limits top speed, and is slower than a multi-geared bicycle on flat or descending terrain once bicycle speed exceeds the rider's ability to maintain continuing increases in ''cadence'' (pedaling revolutions per minute), typically 85–110 [[Revolutions per minute|rpm]].  Compared to a fixed-gear bicycle, a singlespeed is easier to ride downhill and around corners (the inside pedal can be kept up to avoid grounding).  However, it does not help the rider pedal around the dead centres like a fixed gear, nor does it allow the fine speed control or easy trackstands that a fixed gear permits.  The pawls of a dirty and unmaintained freewheel can also clog, leaving the rider with no drive; this is impossible on a "fixie".