????️ What it is
This is an 18-tooth single-speed freewheel cog, meaning it’s the rear gear that both:
- Transfers power when you pedal
- Allows coasting when you stop pedaling (unlike a fixed gear)
It screws onto a threaded rear hub, which is common on BMX and many budget single-speed bikes.
???? Key specs explained
⚙️ 18T tooth count
- “18T” = 18 teeth on the rear cog
- This is a middle-ground gearing choice:
- Easier acceleration than larger cogs (e.g. 16T)
- Slightly less top speed than smaller cogs
- Good balance for BMX cruising, street riding, and general single-speed use
???? Chain compatibility (1/2" x 1/8")
- Standard BMX/single-speed chain size
- Thick, strong chains designed for:
- High impact loads
- Basic maintenance rather than precision shifting
???? Steel construction
- Strong and long-lasting
- Handles abuse (skids, impacts, rough riding)
- Heavier than alloy or high-end CNC cogs, but more durable for the price
???? Threaded freewheel system
- Screws onto a threaded hub (not a cassette system)
- Very common on:
- BMX bikes
- Older MTB wheels
- Budget single-speeds
???? Where it fits best
Bravvos positions this as a budget replacement/freewheel option for:
- BMX street and park bikes
- Commuter single-speeds
- Fixed-gear conversions (as a freewheel alternative setup)
- Older threaded rear hubs
⚠️ Things to check
- Must match your hub type (threaded freewheel hub only)
- Pair with correct chain width (usually 1/8”)
- Gearing must match your front chainring for proper ride feel
???? Bottom line
The Bravvos 18T freewheel is a simple, tough, no-frills rear cog. It’s not performance-oriented, but it’s dependable, cheap to replace, and well-suited to BMX or everyday single-speed setups where durability matters more than precision.
