"Wolf Tooth Components" is a group of hardcore cyclists based in Minneapolis who create unique cycling components. All items are designed independently and produced in the United States.
The Drop Stop Chainring, which is a combination of thick and thin teeth that makes it difficult for the chain to fall off, originated from cyclocross and is now an indispensable item for front singles.
Fits your 5-arm vintage or Surly cranks. Four of the five holes are threaded. Use 10mm bolts for one on the back of the crank. Wolf Tooth's patented Drop Stop Tooth prevents the chain from falling. 10S, 11S, 12S (including SRAM Eagle) chains can be used. If you use a 9S drivetrain, use a 10S chain.