Carbon Construction
CARBON CONSTRUCTION
T700/T800 monocoque carbon fiber frames engineered for the precise balance of stiffness, compliance, and durability that serious mountain biking demands.
Carbon Fiber Grades
Dirtlab frames use a combination of T700 and T800 carbon fiber grades in an epoxy resin matrix. T700 provides the structural backbone — high tensile strength, proven durability, excellent fatigue resistance. T800 is strategically placed in high-stress zones where its higher modulus delivers additional stiffness without weight penalty.
This isn't about marketing grade names. It's about using the right fiber in the right orientation at the right location. A frame made entirely from the stiffest carbon available would ride like a jackhammer. A frame made entirely from compliant fiber would flex under power. The art is in the blend.
T700 Carbon
- Tensile Strength 4,900 MPa
- Tensile Modulus 230 GPa
- Role Primary structure
- Characteristic Strong, durable, forgiving
- Where Used Majority of frame
T800 Carbon
- Tensile Strength 5,490 MPa
- Tensile Modulus 294 GPa
- Role Targeted reinforcement
- Characteristic Stiffer, lighter, precise
- Where Used BB area, head tube, pivots
Monocoque Construction
Every Dirtlab carbon frame is built as a single-piece monocoque shell. Unlike tube-to-lug construction where separate tubes are bonded into lugs (introducing potential failure points), a monocoque frame is laid up as one continuous structure inside a precision mold.
This means no bonded joints in the main triangle. The carbon plies wrap continuously around the bottom bracket, through the downtube, up the seat tube, and around the head tube. The result is a structure that's lighter, stiffer, and more durable than bonded alternatives — with better control over flex characteristics.
Directional Layup Engineering
Carbon fiber's defining advantage over metal is directional control. In aluminum or titanium, the material is equally stiff in every direction. Carbon plies can be oriented to be stiff in one axis and compliant in another — allowing frame designers to tune ride quality zone by zone.
The bottom bracket area is engineered for maximum stiffness — every watt of pedaling force transfers directly into forward motion. The seatstays are deliberately more compliant, absorbing trail chatter and providing small-bump sensitivity that improves grip and reduces fatigue on long rides.
Manufacturing Process
Pattern Cutting
Pre-preg carbon sheets are CNC-cut to exact ply shapes. Each frame uses 200+ individual plies, each with a specific fiber orientation (0°, 45°, 90°) optimized for its position in the layup.
Hand Layup
Plies are laid into precision aluminum molds by hand, following a strict layup schedule that defines the exact sequence, orientation, and overlap of every ply. This is where the frame's ride character is determined.
Bladder Molding
An internal bladder inflates under pressure inside the mold, compacting the carbon plies against the mold walls. This eliminates voids and ensures uniform fiber density — critical for strength and weight consistency.
Autoclave Cure
The mold enters an autoclave at controlled temperature and pressure. The epoxy resin cures over several hours, cross-linking into a rigid matrix that locks the carbon fibers in position permanently.
CNC Machining
After demolding, pivot holes, headtube faces, bottom bracket threads, and cable routing ports are CNC-machined to tight tolerances. Every interface point is precision-finished for reliable component fitment.
QC & Finish
Each frame undergoes ultrasonic inspection for internal defects, dimensional verification on a surface plate, and a visual inspection under controlled lighting. Frames are then painted, clear-coated, and graphics applied.
Custom Color Program
Every Dirtlab carbon frame is available with custom Pantone color selection for both the frame body and decal graphics. Choose from curated quick-pick palettes or specify any Pantone or RAL color code. Standard colorways (2-3 per model) ship at no extra charge. Custom colors carry an upcharge for the additional paint and masking work.
Finish options: Matte, Gloss, or Satin clear coat.
Carbon Frame Models
Paratu CP
170mm rear travel. K-Volve anti-squat kinematics. Available as pedal bike or eMTB with Maxon BIKEDRIVE AIR S.
Iuhu CP
160mm rear travel. Aggressive trail geometry with S-Volve reach-based sizing.
Iuhu HL
140mm rear travel. Versatile trail bike balancing climbing efficiency and descending capability.
Iuhu LT
130mm rear travel. Lighter, nimbler trail platform for riders who prioritize pedaling and flow.
Tutumaz XC FS
Short-travel cross-country platform. Race-ready weight with full suspension comfort.
Tutumaz HT
Pure XC hardtail. Minimum weight, maximum efficiency for racing and fast trail riding.
See It in Action
Carbon Frame Models
Frequently Asked Questions
What type of carbon fibre is used?
Our frames use a combination of high-modulus (HM) and intermediate-modulus (IM) Toray carbon fibre. High-modulus provides stiffness where needed (bottom bracket, head tube) while intermediate-modulus allows controlled flex for compliance and impact absorption in other areas.
How strong are carbon frames compared to aluminium?
Properly engineered carbon frames exceed aluminium in strength-to-weight ratio by a significant margin. Our frames are tested to ISO 4210 and beyond — including impact testing at 2x the required standard. Carbon allows us to place material exactly where stress concentrations occur, something impossible with metal tubes.
Can a cracked carbon frame be repaired?
In many cases yes, but it depends on the location and severity of damage. Minor cosmetic damage (paint chips, surface scratches) does not affect structural integrity. For structural damage, we recommend professional inspection. We offer a crash replacement programme with discounted pricing on a new frame.
Where are the frames manufactured?
Taiwan. Our carbon frames are produced in facilities that also manufacture frames for many of the world's leading bicycle brands. Taiwan's carbon composite manufacturing expertise is unmatched — approximately 90% of the world's highest-quality bicycle frames are made there.
What is the frame warranty?
All carbon frames carry a lifetime warranty against manufacturing defects for the original owner. This covers delamination, bonding failures, and structural defects — not crash damage or misuse. Registration is required within 30 days of purchase.