Wheels Manufacturing Cassette Spacer

Wheels Manufacturing NCS-4.5 4.5mm cassette spacers are a small but essential part when adapting older 7-speed cassettes to modern 8-speed freehub bodies. Each spacer slips onto the hub body before the cassette, filling the 4.5mm gap so the cassette locks up with correct spacing and preload.

These spacers are CNC-machined from a corrosion-resistant alloy and finished for smooth, burr-free edges, which ensures consistent stack height and trouble-free installation. Sold as a bag of five, they’re a handy multi-spare for workshops, pits and travel kits.

Precision construction for dependable spacing. The NCS-4.5 is made to exacting tolerances so each spacer provides a uniform 4.5mm thickness. That accuracy prevents cassette wobble, maintains chainline geometry and ensures proper lockring engagement.

Lightweight, corrosion-resistant finish. The spacer’s finished surface resists corrosion and won’t gall or bind on the freehub body, giving you consistent removal and reinstallation over years of use.

Designed for 7-speed cassettes on 8-speed freehubs. Install the spacer directly onto the 8-speed hub splines before sliding the 7-speed cassette on. Once fitted, tighten the cassette lockring to the manufacturer's torque spec—no adapter required.

This spacer works with standard 8-speed splined freehub bodies and most 7-speed cassettes. It’s ideal for older road frames, vintage builds, budget builds and projects where you want to reuse a 7-speed cassette on a modern hub spacing.

Home mechanics, workshop techs and retrofitters. If you’re restoring a classic road bike, building a thrifted frameset or maintaining a mixed fleet, these spacers let you marry legacy 7-speed cassettes to widely available 8-speed hubs.

Race mechanics and bikepackers will appreciate the bagged five-pack for spares on event days or remote trips — small, lightweight and easy to stash in a seat pack or toolbox.

When choosing a cassette spacer, match the thickness to the difference between your cassette and hub standard — this Wheels Manufacturing spacer provides 4.5mm for 7-speed to 8-speed conversion. Buy a multi-pack if you work on multiple bikes, travel often, or want a spare in your on-bike tool kit.

Confirm your hub is a standard 8-speed splined freehub before purchasing. If you run non-standard hubs (some e-bike, vintage or proprietary designs), consult the hub maker or a wheel-builder to verify compatibility.