MRC-027 29er T1200 Carbon Mountain Bike Frame Set – Boost 148 × 12 mm

Build a lightweight, responsive 29er mountain bike with the MRC-027 Carbon MTB Frame Set. Manufactured from Toray T1200 mixed carbon fibre, this hardtail frame combines modern mountain-bike standards with a lightweight construction suitable for custom MTB builds, cross-country riding and recreational trail cycling.

Designed for 29-inch wheels, the MRC-027 features Boost 148 × 12 mm rear spacing, a tapered head tube, BSA 73 mm threaded bottom bracket and 30.9 mm seatpost diameter. The frame is available in Small, Medium and Large sizes with matte, glossy and customized finish options.

The frame set includes the carbon frame, seatpost, seat clamp, headset, rear thru-axle and derailleur hanger, providing the core components required to begin a custom 29er build.

Key Features

• Toray T1200 Mixed Carbon Fibre – Lightweight carbon construction for modern mountain-bike builds.
• 29-Inch Wheel Compatibility – Designed around a 29er MTB wheel configuration.
• Hardtail Frame Design – Lightweight rear triangle without a rear suspension system.
• Boost 148 × 12 mm Rear Spacing – Compatible with Boost-standard rear hubs.
• Tapered Head Tube – Supports compatible modern tapered-steerer forks.
• BSA 73 mm Bottom Bracket – Threaded bottom-bracket shell for straightforward installation and servicing.
• 30.9 mm Seatpost Diameter – Compatible with matching 30.9 mm seatposts.
• Disc-Brake Compatible – Designed for a disc-brake mountain-bike setup.
• Three Frame Sizes – Available in Small, Medium and Large.
• Lightweight Construction – Frame weights start at approximately 1,750 g.
• Multiple Finish Options – UD black matte, UD black glossy, painted and customized finishes.
• Complete Frame Set – Includes essential frame hardware and components.
• Non-Folding Design – Purpose-built hardtail MTB frame construction.

Product Specifications

Model: MRC-027
Product Type: Carbon Mountain Bike Frame Set
Frame Style: 29er Hardtail MTB
Frame Material: Toray T1200 Mixed Carbon Fibre
Wheel Compatibility: 29 Inches
Available Frame Sizes: S / M / L
Rear Hub Standard: Boost 148 × 12 mm
Rear Axle Type: 12 mm Thru-Axle
Rear Thru-Axle: Included
Head Tube: Tapered
Upper Headset Diameter: 41.8 mm / 1-1/8 Inch
Lower Headset Diameter: 52 mm / 1-1/2 Inch
Bottom Bracket: BSA 73 mm Threaded
Bottom-Bracket Thread: 1.37 × 24 TPI
Seatpost Diameter: 30.9 mm
Brake Compatibility: Disc Brake
Surface Finish: UD Black Matte / UD Black Glossy
Colour Options: Black / Painted / Customized
Foldable: No
Customization: Available
Country of Origin: Taiwan, China

Frame Weight

The MRC-027 provides a lightweight foundation for a custom 29er mountain-bike build.

Small: 1,750 g ± 50 g
Medium: 1,790 g ± 50 g
Large: 1,830 g ± 50 g

The lightweight carbon construction helps reduce overall bicycle weight while maintaining the structural design required for a modern hardtail MTB.

Toray T1200 Mixed Carbon Fibre Construction

The MRC-027 is manufactured using Toray T1200 mixed carbon fibre, providing a lightweight frame platform for performance-focused mountain-bike builds.

Carbon construction is particularly suited to custom bicycles where reduced frame weight, responsive handling and efficient power transfer are priorities.

29er Hardtail Design

The frame is designed for 29-inch mountain-bike wheels and uses a hardtail configuration without rear suspension.

The 29er platform provides a large wheel diameter suited to:

• Cross-country cycling
• Recreational trails
• Gravel routes
• Countryside riding
• Fitness cycling
• Custom lightweight MTB builds

Boost 148 × 12 mm Rear Hub

The rear triangle uses the modern Boost 148 × 12 mm hub standard.

A compatible 148 × 12 mm rear wheel and thru-axle system should be used when assembling the bicycle. The matching rear thru-axle is included with the frame set.

Tapered Head Tube

The tapered head tube features:

Upper Diameter: 41.8 mm / 1-1/8 Inch
Lower Diameter: 52 mm / 1-1/2 Inch

This configuration supports compatible tapered-steerer mountain-bike forks and the supplied headset.

BSA 73 mm Threaded Bottom Bracket

The MRC-027 uses a 73 mm BSA threaded bottom-bracket shell with a 1.37 × 24 TPI thread specification.

The threaded design provides straightforward installation, removal and maintenance when paired with a compatible MTB bottom bracket and crankset.

30.9 mm Seatpost

The frame uses a 30.9 mm seatpost diameter and includes the matching seatpost and seat clamp as part of the frame set.

Disc-Brake Compatibility

The MRC-027 is designed for a disc-brake mountain-bike system, providing compatibility with a modern MTB braking setup when assembled with matching brake components, wheels and rotors.

Included Components

The MRC-027 frame set includes:

• MRC-027 carbon MTB frame
• 30.9 mm seatpost
• Seatpost clamp
• Headset
• 148 × 12 mm rear thru-axle
• Rear derailleur hanger

Components Required to Complete the Bike

A complete bicycle build also requires components including:

• Suspension fork
• Front and rear wheels
• Tyres
• Disc brakes
• Brake rotors
• Crankset
• Bottom bracket
• Chain
• Cassette or compatible rear gearing
• Rear derailleur
• Shifter
• Handlebar
• Stem
• Grips
• Saddle
• Pedals

Available Sizes

The MRC-027 is available in:

• Small
• Medium
• Large

This provides multiple frame-size options for building a 29-inch mountain bike around different rider requirements.

Colour & Finish Options

Available frame finishes include:

• UD Black Matte
• UD Black Glossy
• Painted Finish
• Customized Colour
• Custom Graphics
• Custom Logo Application

These options make the frame suitable for both personal custom builds and branded bicycle projects.

Suitable Applications

The MRC-027 Carbon MTB Frame Set is designed for:

• Custom 29er mountain-bike builds
• Cross-country cycling
• Recreational trail riding
• Gravel routes
• Countryside cycling
• Fitness riding
• Lightweight MTB projects

Assembly Information

Carbon bicycle frames require correct installation procedures and component compatibility. Assembly should be completed using appropriate torque specifications and carbon-compatible installation products.

Before riding, inspect the:

• Headset
• Bottom bracket
• Rear thru-axle
• Derailleur hanger
• Seatpost and clamp
• Brake installation
• Frame surface
• Wheels and tyres
• Drivetrain
• All frame fasteners

Important Usage Information

Use components that match the frame's specified standards, including the 29-inch wheel platform, Boost 148 × 12 mm rear spacing, tapered headset, BSA 73 mm bottom bracket and 30.9 mm seatpost diameter.

Do not drill, cut or structurally modify the carbon frame. Correct installation and torque settings are essential when assembling carbon bicycle components.