Why Pre-Preg
Autoclave
Carbon Fiber
Not all carbon fiber is made equal. We've been building pre-preg autoclave carbon fiber motorcycle parts for over 20 years. Here's what goes into every part we make.
From Toray® pre-preg carbon cloth to CNC trim and UV clear coat — every step determines the quality of what goes on your bike.
What Carbon Fiber Actually Is
Carbon fiber started in aerospace and motorsport, where performance mattered more than cost. Today, pre-preg autoclave carbon fiber parts for motorcycles are accessible — but the process that makes them great hasn't changed.
Carbon fiber cloth, once mixed with resin and cured, becomes an extremely rigid fiber-reinforced composite. The weaving pattern and thread thickness determine the appearance of the finished part. The most common patterns are twill (the classic diagonal weave) and plain, typically in 3K thread thickness — meaning 3,000 carbon filaments in each strand.
Twill Weave
The diagonal 2x2 weave pattern that defines the classic carbon fiber look. Deep, three-dimensional appearance with excellent drape around complex mold shapes. Our most popular finish for fairings, fenders, and body panels.
3K Thread
3,000 carbon filaments per tow (bundle). The standard for motorcycle bodywork — a balance of surface finish refinement and structural integrity. You may see thicker 6K or 12K backing material on some parts; this is structural backing, not the visual surface layer.
Pre-Preg
Carbon fiber cloth pre-impregnated with epoxy resin before layup, stored in a walk-in freezer until use. Pre-preg gives the best possible fabric-to-resin ratio and eliminates the manual resin-application step entirely — the primary reason pre-preg parts are stronger and lighter than wet lay-up alternatives.
Autoclave Curing
A high-pressure heated chamber that cures the pre-preg carbon under both heat and pressure simultaneously. This combination eliminates air voids, ensures uniform resin distribution, and produces a part with consistent, repeatable structural integrity across every unit we make.
The Making of Bestem Carbon Fiber
How Every Part Is Made
Four steps, done right. Craftsmanship determines the outcome at every stage — even with modern CNC and autoclave equipment, the quality of each handoff matters.
Carbon Fiber Material
Toray® pre-preg carbon fiber cloth is fed from cold storage directly into our CNC router and cut to precise shapes for each part. Pre-preg material ensures the correct resin ratio is already locked in — no manual mixing, no variation.
Mold Lay-Up
The cut cloth is laid inside precision metal molds and vacuum is applied. Parts with metal mounting hardware use a second backside mold for exact fitment. Parts requiring smooth back surfaces — like windscreens — also use backside molds for dual-surface finish quality.
Autoclave
Molds are rolled into the autoclave chamber on a cart. Temperature and pressure are set from a digital control panel and monitored throughout the bake cycle. Operators check for vacuum leaks on large panels during the process — any air infiltration creates bubbles that weaken the part and ruin the surface finish.
Trim & Finish
Trimming is done on our CNC rig with a Mitsubishi robot arm. Flat panels may also use waterjet cutting. Some parts are hand-cut by skilled staff. Each part is then cleaned, inspected, and finished with UV-resistant clear coat and hand polishing before shipping.
We Use Toray® Carbon Fiber on Every Part
Toray is the world's leading carbon fiber manufacturer and the material of choice for aerospace, Formula 1, and premium motorcycle applications. We don't source generic carbon cloth — every roll that goes into a Bestem part carries the Toray specification.
Carbon
Fiber
Why the Process Matters for Your Bike
The pre-preg autoclave process isn't just a marketing term — it's the specific combination of material preparation and curing method that determines whether a carbon fiber part is actually better than the plastic it replaces, or just looks like it is.
Wet lay-up carbon fiber — where liquid resin is applied manually to dry fiber — introduces air voids, uneven resin distribution, and relies on a separate clear coat for its appearance. That clear coat can yellow, fog, or peel over time, and the structural properties are inconsistent between parts. Pre-preg autoclave eliminates all of these variables.
Precision OEM Fit
Parts are molded from the same metal tooling used for every unit. No trimming required on your end — bolt-on fit every time, because the mold doesn't change between production runs.
No Voids, No Bubbles
The autoclave applies pressure while heat cures the resin, forcing out any trapped air. The result is a fully dense laminate — no internal voids that could cause delamination or surface blistering over time.
UV-Resistant Finish
Every part is finished with UV-resistant clear coat and hand-polished. The finish doesn't yellow in sunlight and won't fog or peel under normal riding and storage conditions.
Consistent Weight
Pre-preg material has a controlled, consistent resin-to-fiber ratio. This means every part weighs what it's supposed to — not heavier due to excess resin soaking in during a wet lay-up process.
CNC Trimmed
Mitsubishi robot arm trimming on our CNC rig means every edge is cut to the same specification. Hand-cut parts exist only where geometry requires it — and those are handled by skilled staff, not rushed.
10+ Years in Production
We've been making pre-preg autoclave carbon fiber parts for over a decade. The process is the same, the material spec is the same, and the quality standard is the same. These are not products made to look good in photos.
Ready to Upgrade Your Ride?
Browse our full catalog of pre-preg autoclave carbon fiber parts by make and model — BMW, Ducati, Kawasaki, Yamaha, Suzuki, Honda, Triumph, and more. Ships from the USA.
