Best Single Speed Conversion Kit for Shimano HG Freehubs

#1 · Best Overall

1. PeakRider Single Speed Kit

• Material: Aluminum
• Size: 18T
• Package Weight: 0.1 kg

Best for: Lightweight 18T HG conversion.

Why it ranks #1: Its Shimano HG fit is explicit, and the 18T aluminum cassette comes with 12mm, 5mm, and 7mm spacers plus a lock ring.

PeakRider’s unibody cassette uses a positive-negative tooth design to help prevent chain drops while maintaining chain engagement. That combination targets a smoother single-speed ride, and its precision-engraved construction is stated to reduce weight by 40% while retaining strength. The included spacers let you arrange the cassette on a Shimano HG freehub.

The 18T cassette and included 12mm, 7mm, and 5mm spacers give you components for setting up the single-speed arrangement on a Shimano HG freehub. A lock ring secures the cassette, while the unibody aluminum construction keeps the assembly’s stated weight down without giving up strength. Its positive-negative tooth profile is intended to reduce chain slack and vibration, which supports steadier engagement as you pedal. The fixed 18T size suits riders who have already settled on that gearing.

Skip it if you need a choice of cog sizes; the JFOYH kit lists 15T, 16T, and 18T options.

This suits riders converting a Shimano HG setup who want an 18T cog, spacer options, and a chain-retaining tooth profile. Its fixed 18T size is the key boundary, so choose it when that gearing matches your intended ride.

Listed on Amazon as: Single Speed Conversion Kit for Shimano HG Freehub

#2 · Reinforced Base

2. JFOYH Single Speed Kit

• Material: 7075 Aluminum
• Size: 16T
• Package Weight: 0.05 kg

Best for: Hard-riding Shimano HG setup.

Why it ranks #2: It explicitly fits Shimano HG freehubs and offers a 7075 aluminum cog with a reinforced 9mm base for stress distribution.

JFOYH’s reinforced 9mm base is intended to distribute stress across a freehub body and help protect its splines under hard riding. The 7075 aluminum cog also uses extra-tall teeth for chain retention, giving BMX and dirt-jump riders a focused single-speed option with 15T, 16T, and 18T choices.

The 7075 aluminum cog combines a 9mm-thick base with a dedicated single-speed tooth profile. The thick base is meant to spread load across the freehub, while the extra-tall teeth help retain the chain, including when a tensioner is part of the setup. JFOYH lists Shimano HG freehub compatibility and includes spacers and a lock ring, connecting the cog to a specific hub standard with setup hardware. The three listed ratios let riders choose between 15T, 16T, and 18T.

Skip it if you need a 13T cog; the Reverse Components kit includes a 13T cog and chainline spacers.

JFOYH suits BMX and dirt-jump riders seeking a Shimano HG-compatible cog with a reinforced base and chain-retaining teeth. Choose among its listed 15T, 16T, and 18T sizes, and keep that range in mind when selecting gearing.

Listed on Amazon as: JFOYH Single Speed Conversion Kit with 15T / 16T / 18T Cogs, 7075 Aluminum Single Speed Cog with Spacers & Lockring, Compatible with Shimano HG Freehub for BMX & Dirt Jump

#3 · Broad Cog Range

3. Bibike Single Speed Kit

• Material: Alloy Steel, Aluminum

Best for: Broad chain and HG compatibility.

Why it ranks #3: The kit fits Shimano or SRAM 8–11-speed HG bodies and lists cog options from 13T to 22T, with multiple spacers and a lock ring.

Bibike’s stated compatibility with Shimano or SRAM 8–11-speed HG cassette bodies makes this kit a flexible option for many mountain and road bike conversions. It also supports several chain widths, from 1/2 × 3/32 to 1/2 × 11/128, linking drivetrain compatibility to a lightweight 78.6g package.

The cassette is made from high-resistant stainless steel, while its spacers and lock ring use 6061 aluminum alloy; the combination gives the conversion distinct materials for the cog and alignment hardware. The listing specifies compatibility with Shimano or SRAM 8–11-speed HG bodies and chains from 6–11 speeds, giving buyers concrete drivetrain boundaries to check. The package includes a 17T cassette and several spacer widths, so you can arrange the cog position during setup. Its stated total weight is 78.6g.

Skip it if you need an XD or XDR freehub conversion; Wheels Manufacturing’s Solo-XD kit is specifically listed for those bodies.

Bibike fits riders converting a compatible Shimano or SRAM HG-equipped road or mountain bike who value broad chain-width support. Check that your freehub falls within the stated 8–11-speed HG range before choosing this kit.

Listed on Amazon as: Bibike Single Speed Conversion Kit 13T/14T/15T/16T/17T/18T/20T/22T Single Speed Cassette & Spacers

#4 · Tensioner Included

4. PeakRider Tensioner Bundle

Best for: Complete tensioner conversion bundle.

Why it ranks #4: This Shimano HG-oriented bundle pairs a 7075 aluminum cog with a CNC double-pulley tensioner, useful when chain tension needs adjustment.

PeakRider combines a single-speed cog with an adjustable CNC double-pulley chain tensioner, giving DIY converters both gearing hardware and chain management in one bundle. Its 16T option targets balanced everyday riding, while the tensioner’s dual-spring guided pulley is intended to reduce chain slap and vibration.

The CNC 7075 aluminum cog has a reinforced 9mm base and a stated weight of about 66g, features intended to protect Shimano HG freehub splines without adding much cog mass. The bundle also includes a 140g CNC double-pulley tensioner with dual-spring guidance, which is intended to quiet chain slap and vibration. Cog options are listed as 15T, 16T, and 18T, with 16T described as balanced for commuting or urban riding. The tensioner makes this a more complete DIY setup than a cog-and-spacer kit.

Skip it if you want a cog-and-spacer kit without a tensioner; Reverse Components supplies a 13T cog and chainline spacers.

This bundle suits commuters and urban riders converting a Shimano HG setup who want a cog plus adjustable chain tensioning. Choose the cog ratio to suit your riding, and account for the tensioner’s 140g weight.

Listed on Amazon as: 16T Single Speed Conversion Kit & Chain Tensioner Bundle – Complete DIY Upgrade Set for Shimano HG Hubs, CNC 7075 Aluminum Cog with Precision Spacers & Adjustable Tensioner

#5 · Steel Cog Option

5. Reverse Single Speed Kit

• Material: Multiple
• Package Weight: 0.08 kg

Best for: 13T chainline tuning kit.

Why it ranks #5: It converts a normal HG freehub and includes a 13T CrMo cog, alloy lock ring, and seven spacers for chainline adjustment.

Reverse Components pairs a 13T CrMo cog with seven aluminum spacers, giving riders a small cog and multiple options for fine-tuning chainline. The kit converts a normal HG freehub wheel to single speed, so it connects a specified freehub standard with the hardware needed to position the cog.

The CrMo cog has a 7mm-thick Hyperglide spline and 1.8mm tooth thickness, while the alloy lock ring secures the assembly. Seven aluminum spacers—two 10mm, one 5mm, and four 3mm—provide several widths for chainline adjustment during setup. Because the listing specifies a normal HG freehub wheel, this kit is directed at that hub standard rather than XD or XDR conversions. The included cog is 13T, making the fixed size the central gearing consideration.

Skip it if you want a 16T all-around gearing option with a tensioner; PeakRider’s bundle includes a 16T option and adjustable tensioner.

Reverse Components suits HG freehub owners seeking a 13T cog and a broad spacer selection for chainline tuning. Its fixed 13T gearing is the main fit consideration, so choose it when that ratio suits your setup.

Listed on Amazon as: Single Speed Conversion Kit by Reverse Components

#6

6. CooMeng Single Speed Kit

• Material: Aluminum, Nylon, Steel
• Size: Single Speed 16T
• Package Weight: 0.09 kg

Best for: Thick-base dirt-jump cog.

Why it ranks #6: Its 7075 aluminum cog has a 9mm base and extra-tall teeth, but the supplied details do not explicitly identify freehub compatibility.

CooMeng’s 9mm-thick cog base spreads stress across the freehub, addressing a practical concern for riders putting heavier loads through a dirt-jump or BMX conversion. Extra-tall teeth and a narrow-wide profile support chain retention, including use with a chain tensioner, while the kit offers 15T, 16T, and 18T choices.

The one-piece 7075 aluminum cog pairs a 9mm base with a narrow-wide tooth profile and extra-tall teeth. The broad base is intended to distribute stress across the freehub, while the tooth shape helps keep the chain engaged, including when a tensioner is used. A 12mm, 7mm, and 2mm spacer set plus a lock ring provides the listed setup hardware. With three cog sizes named in the title, riders can choose among 15T, 16T, and 18T rather than being limited to one size.

Skip it if you want a stated Shimano HG freehub match; the JFOYH kit explicitly lists Shimano HG compatibility.

This kit suits dirt-jump or BMX conversion projects where a thick base and chain retention are priorities. Its listed sizes are 15T, 16T, and 18T, so make sure one of those ratios matches your intended gearing.

Listed on Amazon as: 15T/16T/18T Single Speed Cogs Conversion Kit for Multi-Speed Bike to Dirt Jump/BMX, Aluminum Single Speed Cassette with Spacer and Locking Ring

#7

7. Wheels Manufacturing Solo-XD

• Size: 18T

Best for: XD or XDR freehub conversion.

Why it ranks #7: The kit is specifically for XD or XDR freehubs rather than the common HG fit named by several alternatives, and its 18T cog is 7075 aluminum.

Wheels Manufacturing’s Solo-XD converts an XD or XDR freehub into a single-speed setup, addressing a hub standard that HG-focused kits do not cover. Its 7075 aluminum carrier and cogs combine low weight with durability, while adjustable spacers help set chainline for the bike’s drivetrain arrangement.

The kit’s base sleeve slides onto an XD or XDR freehub body like a cassette, followed by spacers and an 18-tooth cog secured with a lock ring. That sequence gives the conversion a cassette-like installation workflow, while adjustable spacers help align the chainline. Its 7075 aluminum carrier and cogs provide the stated lightweight durability, and the narrow-wide tooth pattern is intended to improve chain retention. Compatibility is listed for 9–12-speed chains, excluding 13-speed Campagnolo and 12-speed HG+ chains.

Skip it if you use a Shimano HG freehub rather than XD or XDR; PeakRider’s 18T kit is listed for Shimano HG.

This is the fit-specific pick for riders converting an XD or XDR freehub who want adjustable chainline and narrow-wide teeth. Its chain compatibility excludes 13-speed Campagnolo and 12-speed HG+, so check that boundary.

Listed on Amazon as: Wheels Mfg Solo-XD Singlespeed Conversion Kit Black