Rennen Decimal Chainring-4-Bolt 104 BCD standard Gear Size:37.9T DRIVER: 6 pawl aluminum race

DRIVER: 6 pawl aluminum race driver

Fits all 20" and most 24" bikes

Compatible with: 8T driver and up

SIZE: 104mm bolt pattern for 4-bolt chainrings

Featuring a 3-inch rise

Rennen Decimal Chainring-4-Bolt 104 BCD standard Gear Size:37.9T DRIVER: 6 pawl aluminum raceRennen chainrings at J&R Bicycles are precission machined from aircraft quality 7075 T6 aluminum (83% stronger than the 6061 many brands use) Rennen chainrings are 3 16" thick and are made for the stress of the top BMX racers and conditions. Only Rennen offers a single speed specific tooth profile that is designed to last longer and keep chains on. SPECIFICATION MATERIAL: U. S. A. Made 7000 Series Aluminum and CNC machined, specifically shaped teeth