Wheels Manufacturing Single Speed Kit SSK-1
Wheels Manufacturing

Wheels Manufacturing Single Speed Kit SSK-1

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Wheels Manufacturing SSK-1 includes nine precision spacers to mount a single-speed cog on a Shimano HG freehub. Lightweight, low-profile spacers let you dial chainline and secure cog placement quickly.

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Product Details

Overview & Technology

Wheels Manufacturing Single Speed Kit SSK-1 is a simple, high-precision solution for riders who want to run a single-speed cog on a Shimano HG-style freehub. The kit includes nine carefully sized spacers that let you build up the correct stack for a clean, reliable single-speed setup. The spacers are precision machined for consistent thickness and smooth faces to prevent binding. Real-world benefit: the lightweight spacer stack keeps your drivetrain tight and predictable without fuss—ideal for minimalist gravel builds, urban single-speed conversions, or trail riders simplifying their gearing. The whole kit ships in a compact bag and weighs only a few grams, so it won’t add noticeable weight to your wheel.

Key Features

Precision machining and consistent tolerances. Each spacer is machined to uniform thickness to ensure the cog sits true on the freehub body, which helps maintain chainline and reduces side-load wear on bearings. • Includes nine spacers for flexible stacking and fine chainline adjustment. • Low-profile design keeps the cog close to the freehub, improving engagement and clearance. • Lightweight construction for minimal weight penalty and no creak-prone plastic inserts.

Fit, Construction & Compatibility

Designed for Shimano HG-style freehubs. The SSK-1 spacers stack on standard HG splines and accept common single-speed cogs (cog not included). They are compatible with most road, gravel, and mountain freehub bodies that follow the HG profile. The spacers are made from precision-machined metal alloy with smooth edges to avoid burrs and ensure easy installation and removal. Because materials and finish reduce fretting, you get a secure fit and stable cog position even under hard pedaling. Note: you will still need a compatible single-speed lockring and, on vertical-dropout frames, a chain tensioner or eccentric hub to manage chain tension.

Who It's For

This kit is ideal for riders converting a multi-speed wheel to a single-speed setup—gravel and commuter riders who want simplicity and durability, cyclists experimenting with fixed or single-speed drivetrains, and workshop mechanics who need a compact spacer set for quick conversions. It’s also useful for riders building lightweight, low-maintenance bikes for training or winter duty. If you run modern HG freehubs and want a no-fuss way to position a single cog with accurate spacing, the SSK-1 gives you the flexibility to fine-tune chainline and stack height without custom machining.

Key Features

  • ✓ Includes nine precision-machined spacers for flexible single-speed spacing
  • ✓ Designed specifically to fit Shimano HG-style freehub bodies
  • ✓ Low-profile alloy construction keeps cog close to freehub for clearance
  • ✓ Consistent tolerances ensure stable chainline and smooth cog seating
  • ✓ Lightweight kit adds negligible weight to your wheel build
  • ✓ Compact bagged kit for easy storage in the workshop or saddlebag
  • ✓ Ideal for gravel, commuter, and single-speed conversion projects

Specifications

Misc Kit includes 9 spacers

Product Identifiers

Vendor Item # SSK-1
UPC 836572001981

Frequently Asked Questions

Does the kit include the single-speed cog?

No. The SSK-1 contains nine spacers only. You will need to purchase a compatible single-speed cog (sold separately) and a single-speed lockring to secure the cog on the freehub.

What freehubs are compatible with these spacers?

The spacers are intended for Shimano HG-profile freehub bodies and most HG-compatible hubs. They will work with many road, gravel, and mountain HG freehubs but are not designed for Micro Spline or SRAM XDR bodies.

What material are the spacers made from?

The spacers are precision-machined from a lightweight metal alloy with smooth, deburred faces to ensure snug seating and long-term durability. The finish minimizes fretting and makes stacking and removal easy.

How do I set chainline and tension with these spacers?

Stack spacers on the freehub until the cog aligns with your frame's chainline. For horizontal dropouts or an eccentric hub, adjust the wheel position to set chain tension. For vertical dropouts you’ll need a chain tensioner or an eccentric bottom bracket/hub to maintain proper tension.

Do I need any special tools to install the spacers?

No special tools are required beyond a chain whip and bench vise or axle retention to remove any existing cassette. Install the spacers by sliding them on the freehub spline, mount your cog, then thread on the single-speed lockring and torque to spec.

Can I use these spacers with a cassette?

These spacers are intended for single-cog setups on HG freehubs. They are not a replacement for cassette spacers used for stacked cassettes. If you are reusing a cassette, follow cassette manufacturer spacer recommendations.

Buying Guide

When choosing a spacer kit for single-speed conversion, confirm your hub's freehub profile first—SSK-1 is built for Shimano HG-style bodies. Consider the cog tooth count you want and whether your frame requires a chain tensioner (vertical dropouts) or can use wheelset positioning (horizontal dropouts or eccentric systems). Look for kits with precision machining and consistent thickness so the cog sits true; that improves shifting (if fixed/free switching) and reduces bearing wear. Also budget for a quality single-speed lockring and compatible cog—spacers are the glue that lets those parts sit in the right place.

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