????️ What it is
This is a small BMX freestyle chainring (28T) designed for very small BMX bikes (around 12” wheel size) or entry-level kids’ setups using a small bottom bracket / one-piece crank system.
Despite the naming, the “12-inch” refers to the bike size category, not the physical size of the chainring.
???? Key specs explained
⚙️ 28T tooth count
- 28 teeth on the front chainring
- Gives a balanced, slightly speed-leaning BMX gear ratio
- On a 12” bike, this helps keep pedalling manageable as kids learn to ride
???? 12” BMX compatibility
- Designed for very small bikes (kids BMX / beginner bikes)
- Lower gearing demands help smaller riders pedal more easily
???? Disc-style sprocket
- Solid “disc” shape instead of spoked design
- Benefits:
- Protects chain from impacts
- Reduces snagging on clothing or obstacles
- Adds stiffness and durability
- Common on modern freestyle BMX setups
⚙️ Small bottom bracket (Sml BB) compatibility
Bravvos designed this for:
- One-piece crank systems (OPC)
- Small BMX bottom bracket standards (43 mm / sometimes 51.5 mm depending on frame)
- Entry-level 3-piece BMX cranks (if bolt pattern matches)
???? W/O pin (without chain retention pin)
- No anti-drop pin on the chainring
- Meaning:
- Simpler design
- Slightly less protection against chain derailment
- In BMX freestyle, this is normal on budget setups
???? Steel construction
- Strong, impact-resistant
- Heavier than alloy or CNC race sprockets
- Built for durability over performance
???? Where it fits best
- 12” BMX / kids’ beginner bikes
- Entry-level freestyle bikes
- Low-speed learning and balance riding
- Budget replacements for worn sprockets
⚠️ Important notes
- Must match your crank mounting system (OPC vs bolt-on BMX crank)
- “12-inch” does NOT mean the sprocket is physically 12 inches
- Not designed for high-performance BMX racing or heavy street abuse
???? Bottom line
This Bravvos 28T disc chainring is a simple, tough, kid-focused BMX sprocket designed for learning and basic freestyle use. It prioritizes durability and safety over performance or weight savings, making it ideal for entry-level 12” BMX bikes.
