Cast Iron 11-Gear Motorcycle Sprocket for 25hT8F Chain Reduction Applications

This product is a specific drivetrain component: an 11-tooth cast iron sprocket designed for use with a 25hT8F chain. It serves as a direct replacement or custom part for motorcycles and electric three-wheel vehicles where this particular gear ratio and chain compatibility are required. The non-circular gear profile indicates it is engineered for a specific reduction purpose within a powertrain system, rather than being a standard circular sprocket. As a single, solid-cast component, it is supplied ready for installation into compatible setups, focusing on the practical need for this exact tooth count and material in modification or repair scenarios.

Features and Construction

This gear's design centres on fulfilling a precise mechanical role within a chain-driven system. Its specifications are defined by a few key, source-supported attributes that determine its application.

Material and Build

The gear is constructed from cast iron, a material frequently chosen for drivetrain components due to its strength and ability to be cast into complex shapes. This one-piece construction means the entire sprocket, including its hub and 11 teeth, is formed as a single unit, which can contribute to structural integrity. The material properties make it suitable for handling the rotational forces and chain engagement typical in motorcycle and three-wheeler applications.

Size and Practical Fit

The critical sizing information is the 11-tooth configuration and its compatibility with a 25hT8F chain. The "25hT8F" designation refers to the chain's pitch and likely its roller width, meaning this sprocket's tooth profile is precisely cut to mesh correctly with that specific chain type. The 'non-circular' shape further defines its fit, as it is intended to create a variable reduction ratio per revolution, which must be matched to the corresponding mating component in the transmission assembly for correct operation.

Uses and Placement

This component has a defined role in vehicle powertrains, suited for both enthusiast projects and functional replacements.

Event or Professional Use

For professional mechanics or custom bike builders, this sprocket is a specific part for modifying final drive ratios or repairing existing systems that utilise a 25hT8F chain. It enables precise tuning of a vehicle's acceleration or top speed characteristics. Its application in electric three-wheel conversions is also noted, where matching a new electric motor's output to an existing axle or wheel hub often requires a custom reduction gear like this one.

Everyday Home Use

For the motorcycle owner undertaking their own maintenance or modifications, this gear provides a ready-made solution when a worn or damaged 11-tooth sprocket needs replacing, provided the original part also used a 25hT8F chain. It allows for a direct swap without needing to modify other parts of the chain drive system, simplifying the repair process for those with the correct technical knowledge.

Benefits and Buying Value

The value of this product lies in its specificity and the practical solution it offers for a narrow but clear mechanical need.

Reuse and Low Maintenance

As a cast iron component, this sprocket is built for durability under normal operating conditions within its designed load capacity. Its value comes from fulfilling a long-term need within a drivetrain; once correctly installed and paired with a proper 25hT8F chain, it should function as a permanent part of the assembly until wear eventually necessitates replacement, much like the original component it supersedes.

Why Choose This Product

You would select this gear if your project or repair explicitly requires an 11-tooth sprocket compatible with a 25hT8F chain, particularly for the stated vehicle types. Its cast iron construction is a standard, reliable choice for such parts. The primary advantage is obtaining a component that matches these exact specifications, potentially saving time and effort compared to searching for or machining a custom one-off part, assuming the provided compatibility matches your system's requirements.