Single Speed Spacer Kit for Mountain Bikes

The Surly Singlespeed Spacer Kit allows you to use singlespeed cassette cogs on any Shimano-style freehub body.
FW9999 Surly Single Speed Kit Spacers and Lockring

turning a vintage mtb into a single speed (not fixed gear) bike

Single or Dingle? A Wheels Manufacturing SOLO-XD Single Speed Conversion Kit Review – Josh Weinberg, The Radavist

Surly krampus dirt drop 29er mountain bike with WHISKY No.9 MTN Boost LT

How to Convert Your Mountain Bike to a Singlespeed - Singletracks Mountain Bike News

Introducing the WM Solo-XD: The Ultimate Single Speed Conversion Kit fro SRAM XD Hubs

DMR MTB Bicycle Single Speed 16T HG Cassette Conversion Kit – Dcbikes

surly シングルスピードキット - パーツ

Building A Better Kids Mountain Bike Drivetrain

Rigs of the 2022 Colorado Trail Race

How to Convert Your Mountain Bike to a Singlespeed - Singletracks Mountain Bike News

2 Speed MTB Project - Engineered to Slide