Toray T1100, M40X & M46X: The Carbon in Our BMX Frames

There is a lot of marketing copy in the bike industry that says "carbon fiber" and stops there. Carbon fiber is not one thing. The fiber inside a race frame matters. The resin holding it together matters. After 37 years building race frames, I am not interested in dancing around any of that. So this is the plain-English version of what goes inside a Supercross BMX Vision frame, why we picked it, and what the data says.

The short answer: the strongest carbon fibers in the world today come out of Toray Industries in Japan. We use three of them. T1100KS in the Vision F1, plus M40X and M46X in the Vision F1x. The same fibers go into Boeing 787 wings, every Formula 1 monocoque, NASA satellite hardware, and the lightest XC race bike Canyon has ever shipped. There is no second-source story that beats it on data.

Here is the long answer.

Why The Carbon Fiber Choice Matters For A BMX Race Frame

A BMX race frame does not live the life of an airliner wing or a road bike. It gets gate-slammed, it gets pedal-mashed out of the saddle for an entire race, it gets landed off doubles and triples, and at some point it goes down on cement or plywood. The four things a race frame has to do, in order, are these.

1. Survive ImpactA frame that can't take a crash without delaminating is finished. This is not a fiber problem first. It's a resin problem. We will get to that.
2. Last Under FatigueA serious racer rides hundreds of laps a week. The frame has to live tens of thousands of cycles without a crack opening up.
3. Be Stiff Where It CountsOut of the gate, through the bottom bracket, through the head tube. Stiffness comes from fiber modulus and from where the high-modulus fiber sits in the laminate.
4. Be LightEvery gram matters at the elite level. Never at the cost of survival.

Get that order right and the rest of the engineering follows. Get it wrong, chase weight first or chase pure modulus first, and you build a frame that sets a great number on a scale and then dies on the third heat of the day.

That hierarchy is why we use Toray. They are the only fiber maker who lets us hit all four priorities at the same time.

Meet Toray, In Plain English

Toray Industries is the world's largest carbon fiber producer. They run the qualified aerospace lines for Boeing's 787 program. They supply Airbus. Every Formula 1 team uses their fiber. Premium golf shafts, top-end fishing rods, NASA satellite booms, deep-sea hydrogen storage tanks. All Toray.

The Toray PAN carbon fiber catalog splits into three classes. T-series fibers (T300, T700, T800, T1000, T1100) are about strength. M-series fibers (M40, M46, M55, M60, M65) are about stiffness. The numbers are real engineering numbers, not marketing ones. The higher the number, the higher the spec.

When you see T1100 you are looking at a fiber rated to about 7,000 megapascals of tensile strength. That makes it the strongest commercially available intermediate-modulus carbon fiber on the planet from late 2014 right up until late 2023. When you see M40X or M46X, you are looking at high-modulus fibers. Stiff, light, and (because of Toray's NANOALLOY surface treatment) much stronger than the M-series fibers that came before them.

Three letters often follow the number (G, S, J, or X) and they tell you how the fiber is sized and processed. KS is a custom Toray sizing of T1100 optimized for prepreg layup with NANOALLOY resin. That's what is in the Vision F1.

The Fibers We Use, And What Each One Does

The Resin Matters As Much As The Fiber

This is the part of the conversation most bike companies skip. Carbon fiber's spec sheet is fiber pulled in tension. A real frame is a stack of pre-impregnated cloth and tape, glued together with resin, cured under heat and pressure. The resin is what holds the layers together when an impact tries to pry them apart.

The number that matters here is interlaminar fracture toughness. Untoughened epoxy gets you about 200 J/m² on a peel test. Toughened epoxy doubles or triples that. Toray's NANOALLOY systems push it to 800 to 1,000 J/m² and up.

NANOALLOY is not marketing language. It's a real piece of materials engineering. The thermoset resin is mixed with a thermoplastic phase that distributes at the nanoscale during cure. The cured resin gets the modulus and chemical resistance of an epoxy with the impact toughness of a thermoplastic. Toray's own data shows their NANOALLOY 2573 prepreg system delivers 14% higher Charpy impact strength than the predecessor system at the same modulus.

Fourteen percent in lab testing is the difference between a hairline check that needs a paint touch-up and a delamination that ends the frame's life. For a BMX race frame, NANOALLOY-class resin is not optional. It's the entry ticket. We run it through the laminate from skin to skin.

Pre-preg, Not Wet Lay-Up. Steel Molds, Not Compromise.

There are two ways to make a carbon part. One is wet lay-up, where dry carbon cloth is soaked with resin by hand using a brush or a roller. It's cheap, it's how most bargain-tier carbon parts are still made, and it produces parts with inconsistent resin distribution, dry-fiber zones, and voids — microscopic air pockets in the laminate that become crack initiation sites the moment the frame sees real load.

The other way is pre-preg. Toray impregnates the Nano Alloy resin into the carbon fiber inside their own plant, controlling resin content to the gram and the percentage point. Every ply that arrives at our factory is already perfectly wetted with toughened resin. No dry fibers. No voids. No improvised resin work in the factory. Every Supercross BMX carbon product is built from full Toray pre-preg, top to bottom. The fiber spec on the page and the resin spec on the page are exactly what gets laid into the mold.

Speaking of the mold. Ours are high-compaction steel. Every one of them. Steel costs more, takes longer to cut, and is harder to modify than aluminum or composite tooling. In return, steel molds hold their dimensions perfectly cycle after cycle. Aluminum molds wear and shift. Composite molds expand and contract under heat. Steel molds give us a frame that is the same shape, ply-for-ply, in unit number 1 and unit number 1,000. The geometry on the spec sheet is the geometry on the frame in your hands. Every time.

Where These Fibers Actually Ship

Marketing claims about carbon fiber are easy. What's worth checking is where the fiber is qualified and shipping in production. Here is the honest list.

That is the production reality. There is no obscure fiber from another producer that beats Toray's data. Hexcel's IM10 is the closest competitor to T1100, and the NASA damage-tolerance numbers favor T1100. Hexcel does not ship a true M40X equivalent. Mitsubishi makes pitch fibers that are stiffer but too brittle for impact-loaded sporting goods. Toray sits at the top of every relevant category.

What We Put In Your Race Frame

The Vision F1 is built from Toray T1100KS unidirectional and woven prepreg with NANOALLOY resin throughout. T1100 is the strongest IM fiber available until T1200, which Toray released in 2023 with restricted aerospace and defense supply. NANOALLOY 2573 is the resin built for impact-loaded sporting goods. The combination is the right one for the load case.

The Vision F1x uses a four-fiber zonal layup engineered to give you the best of every Toray fiber in the part of the frame where it actually pays off. The breakdown of the laminate is exact, and we publish it because we can.

That is the architecture. M40X and M46X drive the stiffness story. T1100 protects the impact-critical zones. T700S Nano Alloy adds flex and abrasion margin where it matters. Nano Alloy resin runs the laminate together from skin to skin. Four fibers, one chassis, every choice deliberate. It is the same kind of zonal architecture Canyon used to build the Exceed CFR, scaled for a BMX race frame's load case.

There is no untoughened epoxy hiding in the inner laminate. We do not paint over a story. The carbon and resin in your frame are exactly what we say they are.

The Standards We Hold Ourselves To

I have been designing BMX race frames since I was 14 years old, when my Hi-Tech BMX prototype got picked up by BMX Plus magazine for their January 1984 new-products page. I designed the SE Assassin in 1986 for Mike at SE Racing. I founded Supercross in 1989 to build a frame for the TECH Racing Team — Billy Harrison, Brian Lopes, Glenn Pavlosky, Brian "Bogi" Givens, Kiyomi Waller — because no factory I called could supply what I wanted. Eight Bike of the Year wins later, the discipline has not changed.

Every Supercross BMX race frame I have ever sold has been built at the same factory I have worked with for more than three decades — one of the original carbon factories that built for Santa Cruz Bicycles before Santa Cruz brought their production in-house. We keep our manufacturing relationships in strict confidence because they took decades to build, but the pedigree is real and the carbon fiber certs ship with every frame batch. When you read "Toray T1100KS, Nano Alloy resin" on the Vision F1 product page, that is what is in your frame. Not a phrase a marketing department picked because it sounded good.

The same standard runs across our brand family. Speedline Parts, our BMX components brand, ships parts I would put on my own son's bike or my own race bike. Supercross BMX frames sit at the top of that family. The carbon fiber discipline is the same. The supplier vetting is the same. The "no marketing copy I cannot defend" rule is the same.

The Bottom Line

The fibers that go into a Supercross BMX race frame are the strongest fibers in their class on Earth, made by the largest and most-qualified carbon fiber producer in the world, glued together by the toughest resin system available for sporting goods, and built by a factory I have personally worked with for 35 years. I cannot put a frame into your hands and tell you it is the best with a straight face unless every layer of that statement is true. With Toray T1100, M40X, M46X, and NANOALLOY resin, every layer is.

If you have ever wondered why a Supercross frame costs what it costs and feels the way it feels, this is why.

Frequently Asked Questions