tandwielsets

A tandwielset is a bicycle gear set used to determine the available gear ratios by combining front chainrings and rear sprockets with the chain, enabling the rider to choose different mechanical advantages. It typically includes the crankset with one or more front chainrings and a rear cassette (or sprockets) mounted on the rear hub, connected by a chain and operated through derailleurs or other shifting mechanisms.

Front configurations range from single to triple chainrings, with 1x, 2x, or 3x setups common on road, mountain, gravel, and commuting bikes. The rear portion consists of a multi-sprocket cassette or freewheel offering a range of speeds, often between 7 and 12, depending on the system. The overall gearing is influenced by chain width, chainline, and the spacing of gears, as well as rider preference and terrain.

Compatibility depends on several standards: the crankset must fit the bottom bracket and provide the correct chainring mounting (BCD and spider design), while the rear cassette must fit the freehub body and be compatible with the rear derailleur and shifters. Chain width must match the number of speeds, and proper indexing of the derailleur is essential for accurate shifting. Common brands (for example Shimano, SRAM, Campagnolo) define their own compatibility ecosystems, though cross-compatibility is limited.

Maintenance considerations include regular inspection of chain wear, cassette wear, and derailleur alignment, as well as correct installation torque and clean lubrication. Advances in tandwielsets include wider-range cassettes and 1x drivetrains that simplify setups, often at the cost of a narrower gear spread.