Gusset Squire Singlespeed Chain Tensioner

The Gusset Squire SS is a spring-loaded chain tensioner for converting a bike with vertical dropouts from geared to singlespeed. It mounts to the existing derailleur hanger and replaces the rear derailleur as a chain tensioner, making it possible to build a singlespeed even on frames where the rear wheel cannot be moved to adjust chain tension.

The Squire comes with two springs and can be set to either “pull up” or “push down,” so the chain is tensioned upward or downward depending on the frame, sprocket, and chainline. It works on both rigid and full-suspension frames where chain length can vary. The CNC-machined aluminum pulley runs on a sealed bearing and can be moved laterally to align with the chainline, while a steel cage around the pulley helps keep the chain in place.

The design is CNC-machined from aluminum and black anodized, weighing 96 grams including hardware. A convenient option when you want to build a singlespeed bike from a frame designed for a rear derailleur, without needing a dedicated singlespeed frame. Please note that the Squire is not compatible with 1/8" chains.

Quick Specs

• Model: Gusset Squire SS Tensioner
• Type: Spring-loaded chain tensioner for singlespeed
• Mounting: In the frame's derailleur hanger
• Use: Singlespeed conversion for frames with vertical dropouts
• Chain tension: Pull up or push down
• Springs: 2 included
• Pulley: CNC-machined aluminum with sealed bearing
• Chainline: Adjustable
• Chain guide: Steel cage to keep the chain in place
• Material: CNC-machined aluminum
• Color: Black anodized
• Weight: 96 g including hardware

• Not compatible with 1/8" chains