Aluminium alloy mountain bike frame for 29-inch wheels with disc brake mounts

This mountain bike frame serves as the core structural component for building a capable off-road bicycle. Fabricated from aluminium alloy, it offers a balance of strength and manageable weight, making it a practical choice for riders seeking a reliable foundation for their build. Designed specifically for 29-inch wheels, the frame geometry accommodates the larger wheel size known for its improved ability to roll over trail obstacles. Key features such as the inner cable routing system and the integrated mounts for disc brakes are included to support modern mountain biking standards, aiming for cleaner looks and more consistent mechanical performance when the bicycle is fully assembled and taken onto the trails.

Features and Construction

The frame's design incorporates several elements focused on functionality and compatibility for mountain biking. The construction details and sizing are provided to assist in component selection and ensure a correct build.

Material and Build

The primary material is aluminium alloy, a standard choice in bicycle framing due to its favourable properties. The frame utilises an inner cable routing system, where the cables for gears and brakes run inside the frame tubes. This design helps shield the cables from external dirt, water, and potential damage, which can contribute to smoother gear shifts and more reliable brake operation over time. The frame also includes built-in mounts to attach disc brake callipers, ensuring compatibility with the powerful and consistent stopping power offered by modern disc brake systems.

Size and Practical Fit

The frame is specified for 29-inch wheels. Its geometry includes a head tube measuring 44-55 * 110mm, which dictates the size of the headset and fork steerer tube required. The beam length is 590mm, influencing the rider's cockpit reach. The five-way junction, where the seat tube, top tube, down tube, and chain stays meet, measures 34 * 68mm. The rear fork length is 385mm, and the open gear spacing (the distance between the rear dropouts) is 135mm, which is a standard width for many mountain bike hubs. The frame offers two riser size options: 30.8mm in diameter with either a 410mm or 460mm length, allowing for some adjustment in handlebar height and rider position.

Uses and Placement

This frame is intended as a component for building a complete mountain bicycle. Its design and specifications point towards its use in off-road cycling environments.

Event or Professional Use

As a foundation for a mountain bike, this frame could be built up with components suitable for recreational trail riding, cross-country cycling, or similar off-road disciplines. The 29-inch wheel compatibility, inner cable routing, and disc brake mounts are common features found on bikes used for these activities. The availability of two riser sizes provides a basic option for fitting the bicycle to different rider preferences or intended riding styles, though final fit should always be determined by a professional bike fit.

Everyday Home Use

For the home mechanic or cycling enthusiast, this frame represents a project starting point. It requires the sourcing and installation of all other bicycle components: wheels, drivetrain, brakes, cockpit, and finishing kit. The provided dimensions are essential for purchasing compatible parts. The inner routing, while beneficial, can add complexity to the assembly process compared to externally routed frames.

Benefits and Buying Value

The value of this product lies in its role as a core building block for a custom or purpose-built mountain bike, offering specific features aligned with contemporary mountain bike standards.

Reuse and Low Maintenance

The aluminium alloy construction is generally resistant to corrosion, contributing to the frame's longevity with basic care. The inner cable routing can help reduce the frequency of cable maintenance by protecting them from the elements. The disc brake mounts offer a modern standard that is widely supported by component manufacturers, ensuring long-term parts availability.

Why Choose This Product

This frame is a consideration for those wanting to build a mountain bike around 29-inch wheels with the practicality of internal cable routing and disc brake compatibility. It provides a blank canvas, allowing the builder full control over component selection to meet specific performance goals or budget constraints. The clear specification of key dimensions assists in planning the build and avoiding compatibility issues.