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Our Premium 1X 104 & 64bcd Oval traction chainrings are designed for any cranks that use 104bcd mounting interface. This is the most common mounting standard for Shimano and other 4 arm cranks. It is ideal for 1x 9/10/11/12spd and Singlespeeds. Oval (elliptical) narrow wide chainring does not compromise the work of clutch mechanism in rear derailleur. It also does not require chain tensioner when using in singlespeed application. Riding out of saddle on the uphill will become more pleasant. These chainrings also help you to recover after knee injuries as pedaling becomes smoother and less exhausting. It is the most advanced oval chainring currently on the market. The most advanced, Patent Pending narrow/wide tooth profile ever produced, guarantee minimum 12 months of excellent chain retention capabilities! We mean it. Always use a new chain with a new chainring.