The 1/8" Single Speed Conversion Kit is the ultimate solution for riders looking to ditch the complexity of a multi-gear drivetrain and transform their bike into a reliable, low-maintenance single speed. Specifically designed for use with heavy-duty 1/8" chains (standard on BMX, Track, and many E-bikes), this kit allows you to convert a standard Shimano-style HG cassette hub without the need for a new wheelset.
This kit provides a rock-solid chain line by using a series of precision-engineered spacers, allowing you to align the rear cog perfectly with your front chainring. Whether you are building a bulletproof commuter, a dedicated street cruiser, or a simplified dirt jumper, this conversion kit delivers a quiet, skip-free riding experience.
1/8" Specific Cog: Features a thicker, more durable tooth profile designed specifically for wider 1/8" chains, providing better engagement and a longer lifespan than thin 3/32" alternatives.
Precision Spacers: Includes a variety of anodized aluminum spacers that allow for micro-adjustability, ensuring a laser-straight chain line to prevent premature wear.
HG Hub Compatibility: Designed to slide directly onto standard Shimano-style hyperglide (HG) freehub bodies, making it compatible with the vast majority of mountain and road bike wheels.
Steel Cog Construction: Heat-treated steel sprocket ensures the teeth won't "hook" or wear down rapidly, even under the high torque of standing climbs.
Deep Tooth Profile: Engineered with taller teeth to prevent chain drops, providing security even when riding over rough terrain or through city potholes.
Lightweight Lockring: Includes a high-strength alloy lockring to keep the entire assembly compressed and secure under load.
| Feature | Specification |
| Cog Width | 1/8" (Heavy Duty) |
| Compatibility | Shimano HG Style Freehubs |
| Material (Cog) | Heat-Treated Steel |
| Material (Spacers) | Anodized 6061 Aluminum |
| Chain Type | 1/8" Single Speed / BMX Chain |
| Includes | Cog, Spacers, and Lockring |
Urban Commuters: Perfect for those who want to eliminate derailleur maintenance and enjoy the silent, reliable feel of a single-gear setup.
Dirt Jump & Street Riders: Ideal for riders who need a bombproof drivetrain that can handle the impacts of jumps and technical tricks without the risk of chain slap or mechanical failure.
Project Bike Builders: The easiest way to modernize an old geared frame or a spare wheelset into a clean, minimalist build.
Multi-Gear Requirements: If your daily ride involves extreme vertical climbs or high-speed descents, the lack of gear range may be a limitation.
3/32" Narrow Chains: This kit is specifically for 1/8" chains; if you are using a standard 7/8/9-speed chain, you will need the narrower 3/32" version of this kit.
The secret to a perfect single-speed conversion is the chain line. Before tightening your lockring, stand behind the bike and sight the chain from the rear cog to the front chainring—it should be a perfectly straight line. If it’s angled, swap your spacers around until it’s dialed. Also, if your frame has vertical dropouts, remember that you’ll likely need a chain tensioner to take up the slack since you no longer have a derailleur to do the job!
