If you’re looking to convert a mountain bike to a single-speed setup, you want reliable cogs, proper spacers, and sturdy tensioners. This guide highlights top single-speed conversion kits and tensioners suited for MTB builds, including options for Shimano and SRAM hubs. Each product is chosen for ease of setup, compatibility with common hub bodies, and solid chain retention. Ideal buyers include casual trail riders seeking simplicity, bikers who want fewer derailleur issues, and enthusiasts who want a clean, low-maintenance drivetrain. Below is a quick buying table to compare essentials.
| Product | Best For | Key Benefit |
|---|---|---|
| Bibike 13T–22T Single Speed Cassette | MTB and road riders | Wide gear range with spacers for easy setup |
| PeakRider 11T Pulley Tensioner | Rough terrain | Sealed spring system and stable chain control |
| CooMeng 15T/16T/18T Cog Kit | Dirt jumps / BMX | One-piece 7075 aluminum for strength |
| CyclingDeal 18-Tooth Kit | Multi-speed hub to single speed | All-in-one spacer and alignment kit |
| BNYTXV Chain Tensioner | Any MTB single-speed build | Lightweight adjustment and simple conversion |
Bibike 13T–22T Single Speed Cassette & Spacers
The Bibike kit is designed for MTB and road bikes using Shimano or SRAM 8–11 speed HG cassette bodies. It includes a 16T or 17T/18T/20T/22T options with spacers to fit 1/2″ x 3/32″ to 1/2″ x 11/128″ chains. This kit suits riders who want a simple gear range conversion while preserving a lightweight, low-profile setup. Best for riders who want a straightforward conversion with compatible spacers and a lock ring. Caution: verify your freehub compatibility and chain width before ordering, as some hubs may require different spacers.
PeakRider 11T Pulley Single Speed Chain Tensioner
The PeakRider tensioner is CNC aluminum with an 11T guide pulley and a sealed spring system. It’s designed for aggressive trail riding, all-mountain, and downhill scenarios, offering strong chain tension and reduced chain slap. Best for riders who need reliable tension in mud or dust and want a compact, lightweight tensioner that still handles rough terrain. Limitation: some frames may require precise alignment to avoid rubbing on tight clearances.
CooMeng 15T/16T/18T Cog Kit for Multi-Speed to Dirt Jump
These 15T/16T/18T single-speed cogs are built for dirt jump and BMX-style use on multi-speed bikes. They use a wide 9mm base to distribute stress evenly and prevent freehub damage under heavy loads. The one-piece 7075 aluminum flywheel is strong yet lightweight (about 66g), with a narrow-wide tooth profile for improved chain retention. Best for riders who want a robust, lightweight cog with dependable chain grip. Choose this if you need a simple, durable inline cog and want lightweight construction; avoid if you require a larger gear range beyond 18T.
CyclingDeal Conversion Kit for Shimano Sram Hubs
The CyclingDeal kit converts a multi-speed hub to a single-speed wheel and is compatible with Shimano or SRAM 7–11 speed cassette hubs. It includes spacers, a lockring, and a sprocket, and provides multiple spacer sizes to help achieve a perfect chain line. Best for riders who want to retain their existing chain and hub components while achieving a clean single-speed setup. Limitation: it will not convert a hub to a fixed-gear, so the hub remains a freewheel design in some cases.
CooMeng 15T/16T/18T Cog Kit (Alternate Listing)
This alternate CooMeng kit reiterates the 9mm base design and the one-piece 7075 aluminum alloy flywheel with an emphasis on strength and weight. Best for riders who value a strong base and reliable chain retention with a lightweight cog. If you already own compatible spacers, you can reuse them; otherwise verify spacer compatibility with your hub. Limitation: similar to other aluminum cogs, extreme loads over time could wear the teeth faster than steel alternatives.
Bibike 13T–22T Second Listing
This Bibike listing mirrors the 8–11 speed HG compatibility and chain width range, with a similar set of spacers and lock ring. Best for buyers who want a well-supported, widely compatible kit with a broad tooth count range. Caution: ensure the exact 13T–22T option matches your freehub’s clearance and the frame’s chainstay space.
Buying Guide
- Hub compatibility: Confirm your freehub body type (Shimano/SRAM HG) and whether the hub is a freewheel or fixed-gear style, as some kits explicitly require one or the other.
- Gear range and chain compatibility: Choose a cog size range (e.g., 13T–22T) that fits your riding terrain and ensure your chain width matches the kit’s allowance (commonly 1/2″ x 3/32″ to 1/2″ x 11/128″).
- Spacers and chain line: A kit with a complete spacer set helps achieve a proper chain line, improving shifting reliability and drivetrain longevity.
- Chain tension and stability: Tensioners and thicker bases (like 9mm bases) distribute pedaling forces to protect the freehub and reduce chain drops on rough terrain.
- Weight and strength: One-piece aluminum cogs offer a balance of strength and lightness; however, some riders prefer steel for longer wear in extreme conditions.
FAQ
- What is a single-speed conversion kit?
A conversion kit allows turning a multi-speed hub into a dedicated single-speed setup by adding a cog, spacers, and sometimes a chain tensioner.
- Do all hubs support single-speed cogs?
No. Some hubs require specific freehub bodies or spacers. Check compatibility with Shimano/SRAM HG freehub bodies before purchasing.
- Are tensioners necessary for a single-speed build?
Tensioners help maintain consistent chain tension on rough terrain and with longer chainstays, reducing chain drops.
- What gear size should I choose?
Choose a cog size based on terrain: steeper routes benefit from larger cogs (e.g., 16T–18T), while flatter rides may work with smaller cogs (e.g., 13T–15T).
- Will these kits fit both MTB and road bikes?
Most kits target MTB use, but some are compatible with road frames if the hub and rear triangle have enough clearance for the cog and spacers.