All bikes have either 3- or 4-speed transmissions, plus a second choice of HIGH or LOW bands to apply the same gears to road travel or slower off-road travel. The early bikes achieved this by having two drive sprockets at the rear wheel, which required the rider to dismount and thread the chain onto the desired sprocket.
In the context of bicycles, all models typically have either 3- or 4-speed transmissions, along with an optional HIGH or LOW gear setting for adapting to road travel or slower off-road excursions. Early bicycles utilized a different approach, employing two drive sprockets at the rear wheel, which required the rider to dismount and manually adjust the chain.