The SE Bikes one-piece steel chainring is a durable single-speed chainring designed for BMX and cruiser bikes that use traditional one-piece (Ashtabula-style) cranks. It’s built for strength and long service life in everyday riding.
This chainring is commonly used as a replacement on classic BMX builds or cruisers where durability is prioritized over weight savings.
Key Features
• One-piece chainring designed for one-piece crank systems
• Steel construction for durability and wear resistance
• Standard tooth profile for consistent chain engagement
• Single-speed specific design
Compatibility & Use Notes
• 39-tooth chainring
• Compatible with 1/2" x 1/8" chains
• Mount compatibility: one-piece crank only
• Designed for single-speed drivetrains
• Available in multiple color finishes
Service / Ownership Context
Steel chainrings wear more slowly than alloy but add weight. Proper chainline and chain tension are still important to prevent noise and premature chain wear, especially on one-piece crank systems.
Fit & Use Signals
• Good fit for BMX or cruiser bikes with one-piece cranks
• Good fit for single-speed setups that see regular use
• Good fit for 1/2" x 1/8" chain drivetrains
• Not a fit for three-piece crank systems
• Not a fit for multi-speed drivetrains
