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A single-speed bicycle is a type of bicycle with a single gear ratio and a freewheel mechanism. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. Adult single-speed bicycles typically have a gear ratio of between 55 and 75 gear inches, depending on the rider and the anticipated ...
They are durable and comfortable, capable of transporting baggage, and have a wide gear range. The BXR bike (a.k.a. Bicycle Crossroadster) or Sport Touring BMX. features an lightweight BMX bike-sized (20-inch/406 mm rims) wheels or (22-inch/451 mm rims) wheels; Built-in frames, usually from the BMX racing, minivelos or foldable city/touring bikes.
The Raleigh "Twenty" was originally fitted with 20" × 1-3/8" wheels and tyres (ISO 35-451), but most export versions were sold with 20" × 1.75" wheels and tyres (ISO 47-406) – the same as BMX bicycles. Many were sold as either single speed with coaster brake or fitted with a Sturmey-Archer AW three-speed hub. The New-Zealand-manufactured ...
When "safeties" replaced "ordinaries", chains and sprockets allowed small wheels to be turned faster than the pedal cranks. As result, a 28-inch wheel could be made to move a bicycle at the same speed as a 60-inch wheel. Such a bicycle was then said to be geared at 60 gear inches and pedalled similar to an ordinary with a 60-inch wheel.
All Rhoades Car bikes are made from welded square 2×2-inch 0.0598-inch (14-gauge) steel tubes. They feature 20×2.125-inch wheels. The two- and four-seat models have independent pedaling, with compound transmissions of up to 42 gears available.
The heavier bikes tend to have 3x8 gearing systems, involving an internally geared rear hub and an external derailleur. The Birdy Race (10.9 kg or 24.0 lb) was introduced in 2013 and had dropped handlebars, and Shimano 20-speed gears with two front chainrings.