Single Speed Cogs Conversion Kit for Multi-Speed Bike to Dirt Jump/BMX

16T/18T Single Speed Cogs Conversion Kit for Multi-Speed Bike to Dirt Jump/BMX, Aluminum Single Speed Cassette with Spacer and Locking Ring

• Built as one solid aluminum piece, this single speed cog takes hard pedaling without the flex or cracking that split-ring designs suffer on dirt jump and BMX rigs.
• Tall, narrow-wide teeth bite the chain and hold it through rough lines and big landings, so you drop gears less and ride with a cleaner, quieter drivetrain.
• 18T Pink to match your build; at just 60–67 g it adds almost no weight to a pared-down single-speed setup.
• Comes with 12 mm, 7 mm and 2 mm spacers plus a lock ring to seat on a splined freehub body; pair with a chain tensioner for a tight, straight chain line.
• Turn a cluttered multi-speed hub into a simple, low-maintenance single speed; the small 12.5×2 cm cog is easy to stash, swap, or keep as a trail-side spare.