Lunar Bikes - Single Speed Cogs

The Quick-Cog^TM

Introducing the Quick-Cog ^TM , a high-performance, quick change, modular cog system for single speeds. Two-piece design allows the cog to be replaced without disassembling the hub cassette making it fast and easy to change gearing. Only a small screwdriver, knife, or even a strong fingernail is needed to remove the spiral retaining ring.

The two-piece system consists of the driver and the cog. The mating interface features a precision machined custom involute spline which transfers torque over a large surface area for maximum strength and durability. A significant weight savings is achieved by combining the wide aluminum driver mated to a high-strength stainless steel cog -only 52 grams assembled with a 18T cog!

The cog driver has a extra wide base where it makes contact with the cassette spline. This spreads the load over a wide area of engagement which prevents damage to the cassette compared to thin one-piece cogs. The lightweight driver is precision machined from aircraft grade 7075 aluminum and hard anodized to military specifications for long lasting surface protection.

The cog is made from a proprietary high-strength aircraft grade stainless-steel. We worked closely with a aerospace heat-treating company to develop precise heat-treatment procedures. The result is a virtually indestructible cog with a exceptionally durable surface that resists wear in extreme operating conditions.

We created our own custom tooth profile which allows the chain rollers to transition from tooth to tooth with the lowest amount of friction while maintaining uniform contact reducing chain wear. The tooth has the tallest shape you will find on any cog, this keeps the chain tracking straight and prevents chain skipping even when running a fairly loose chain.

Quick-Cog ^TM - Modular Single Speed Cog System

Hard-anodized aluminum cog driver
Choice of heat-treated stainless steel cog
Two stainless steel spiral retaining rings

$59.95 set

Spacer Kit for the Quick-Cog ^TM

The Spacer Kit includes two matching black anodized aluminum spacers for a clean and simple installation. Designed for two standard chain line sizes. The chain line is measured from the center of the bottom bracket shell to the center of the middle chain ring. Contact us for custom applications.