NarrowWide

NarrowWide refers to a bicycle chainring tooth profile in which the teeth alternate between narrower and wider widths. This design is used to improve chain retention on single-chainring (1x) drivetrains by helping the chain stay engaged with the ring during pedaling, especially on rough terrain or steep climbs.

The concept works by providing alternating contact surfaces for the chain’s inner and outer plates. The narrow teeth give space for the chain to sit between the links, while the adjacent wider teeth offer a larger capture surface, which helps prevent the chain from dropping off the ring between shifts. This arrangement reduces the need for a front derailleur and is commonly paired with standard chains on 1x setups.

NarrowWide chainrings are widely used on mountain bikes, gravel bikes, and cyclocross bikes that rely on a single front chainring. They come in a range of tooth counts and are manufactured from materials such as aluminum or steel. Some designs include ramped or chamfered edges to assist with smoother chain engagement and shifting, even though they are primarily optimized for retention rather than rapid shifting.

Advantages include improved chain retention, simpler drivetrains without a front derailleur, and compatibility with many 1x configurations. Potential downsides can include slightly increased wear on the chain and ring, possible noise or friction in some setups, and generally higher cost compared with standard chainrings.

Overall, NarrowWide represents a practical approach to enhancing reliability in modern 1x bicycle drivetrains, balancing retention with acceptable wear and performance characteristics.