The Hope Direct Mount chainring has special teeth with narrow and wide shape in the change, which reliably prevent the chains from jumping off. In conjunction with a SRAM Type2 or Shimano Shadow + rear derailleur, which have a greatly increased bias of the cage, the chain is reliably held in position even without chain guide. These chainrings fit only the patented HOPE Spiederless Retainer System, therefore only compatible with HOPE crank. HOPE Direct Mount Spiderless Retainer ChainRing Features Application: MTB, XC, DH Material: Aluminum 7075-T6 Technology: Narrow Wide Attachment: Hope Direct mount Number of teeth: 26, 28, 30, 32, 34 or 36 teeth Compatibility Cranking: Hope Direct Mount Cranks Compatibility Chain: 9-, 10-, 11-, 12-speed (SRAM Eagle) Mounting: Single Chain line: NA Offset: BOOST Adjustment possibilities Weight  64g (32 teeth)