They have an External Diameter of 35mm

The replaceable chain means it should last forever

Expandable design

These work great with Wolf Tooth or any other brand single chainrings

Pros: Secure straps

Wolf Tooth 4 Bolt Alloy Drop-Stop Chainring - 110 BCD - Asymmetrical SRAM - Round - Black - 42T Exclusive They have an External DiameterIf you are in need of a 4 Bolt Chainring, chances are Wolf Tooth have an option to suit. Made from a high grade 7075 T6 aluminium Wolf Tooth's Drop Stop Chainrings are one of the best performing and longest lasting wide narrow chainring options on the market. Chain Retention Technology: Drop Stop technology is Wolf Tooths patented wide narrow chainring design. The wide side of the tooth has maximum contact on the drive side which spreads the load and