bagkædehjul

Bagkædehjul, often translated as rear sprocket or cogset, is a critical component of a bicycle's drivetrain. It is a set of gears located on the rear wheel of a bicycle. These gears work in conjunction with the front chainrings and the chain to propel the bicycle forward. The number and size of the sprockets on a bagkædehjul vary greatly depending on the type of bicycle and its intended use.

The primary function of the bagkædehjul is to provide different gear ratios. A smaller sprocket on the rear wheel results in a higher gear ratio, making it easier to pedal at higher speeds on flat terrain or downhill. Conversely, a larger sprocket results in a lower gear ratio, which is beneficial for climbing hills or for starting from a standstill, as it requires less force to turn the pedals.

Modern bicycles typically feature derailleurs that allow the rider to shift the chain between the different sprockets on the bagkædehjul while riding. This enables riders to adapt to varying terrain and maintain an efficient pedaling cadence. The sprockets are usually made of steel or aluminum and are attached to the rear wheel hub, often as part of a cassette or a freewheel mechanism. The teeth on the sprockets are specifically shaped to engage smoothly with the bicycle chain, ensuring efficient power transfer and minimizing wear.