Speedline started in 2007 with one rule: build BMX race parts to the same standard as the carbon frame they bolt onto, at a price that lets racers actually race them. Sixteen years later, the Elite Carbon Hollow Cranks are what that rule produces — 495 grams of hollow-molded Toray carbon, with a 30mm oversized spindle and a carbon-titanium composite spider, set in a precision EB30 sealed bearing bottom bracket. Lighter and stiffer than the competition. We won't just claim it. We'll prove it.

The Numbers

The Material — Toray Nano Alloy Carbon

The Speedline Carbon Fiber arms are hand-laid up with Toray Nano Alloy Carbon — the same Toray fiber family that goes into our Vision F1 carbon race frame. This isn't commodity carbon. Toray controls supply tightly and grants direct access only to manufacturers with the engineering rigor to use it correctly. Our 35-year cycling-manufacturing partnership gives us that access.

After hand layup, every arm is high-compaction molded at controlled temperature and pressure to consolidate the carbon into the densest, stiffest structure possible. The result is a hollow crank arm that resists flex under gate-launch load while keeping weight in the right places — and out of the wrong ones.

Hollow construction matters because solid carbon arms are heavy and unnecessary. The forces in a BMX crank arm are concentrated near the spindle and near the pedal — the middle of the arm doesn't need solid material. Building the arm hollow means the same stiffness at half the mass. That's the engineering reason these cranks weigh 495 grams instead of 800.

The Spider — Where Most Cranks Compromise

The crank spider is where almost every "carbon" crankset on the market makes a quiet compromise. Most carbon cranks use an aluminum spider bonded to carbon arms. The aluminum is heavy, the bond joint flexes, and energy you put into the pedal stroke is absorbed by the joint instead of being transferred to the chain.

The Speedline Elite spider is built differently. The carbon fiber spider features special layers of carbon-titanium composite for exceptional strength-to-weight ratio, integrated with a 7075 aluminum insert precisely where the chainring mounts. Carbon where you want stiffness without weight. Titanium-composite for impact resistance. 7075 aluminum where you need a hard interface to bolt to. The result is a spider that doesn't flex under load and doesn't add unnecessary grams.

The Spindle — 30mm Oversized

The Elite Carbon Cranks use a 30mm oversized spindle. Larger diameter than standard 24mm BMX spindles. There's a real engineering reason for this:

Spindle stiffness scales with the fourth power of diameter. A 30mm spindle is roughly 2.4× stiffer than a 24mm spindle of the same material — not 25% stiffer. That oversized spindle is what lets us use a hollow carbon arm without the system flexing under gate-launch load. The arms transfer power through the spindle without absorbing it. Energy from your legs goes to the rear wheel where it belongs.

The spindle is paired with our EB30 Sealed Bearing Bottom Bracket — precision-ground hardened steel balls in cartridge bearings. Hardened steel spins more reliably and outlasts ceramic options under the impact loading a BMX bottom bracket actually sees. Smooth out of the box, smooth after thousands of laps.

The Heritage — From Strongarm to Elite Carbon

This crankset has a lineage. In 1990, Bill Ryan hand-built five sets of bent-arm cro-mo cranks for the original Supercross factory team. He called them Strongarms. The engineering came from a teenage conversation with Pete "Pistol Pete" Loncaravich at the Orange Y track — Pete explaining leverage physics on a notepad, Bill listening. Todd Steen ran a set. BMX Plus! tested a set. Ken Cools — older brother of Olympian Samantha Cools — got a set. That moment established the Supercross product vision: Frame, Fork, Bar, Cranks. A complete drivetrain, engineered as a system.

Speedline Parts launched in 2007 to take that vision and put it in the hands of racers who weren't on the Supercross factory team — including Maris Strombergs, who ran Speedline parts when he was racing for a different frame brand and won two Olympic gold medals on them.

The Elite Carbon Hollow Cranks are the latest evolution of that Frame, Fork, Bar, Cranks vision. Same engineering principles. Better materials. Sixteen years of refinement.

What Makes the Elite Different

• Hollow Carbon ArmsHand-laid Toray Nano Alloy Carbon, high-compaction molded. Same fiber family as our Vision F1 race frame.
• 30mm Oversized Spindle~2.4× stiffer than a 24mm spindle. Eliminates system flex under gate-launch load.
• Carbon-Titanium Composite SpiderCarbon for stiffness without weight. Titanium-composite for impact resistance. 7075 aluminum where the chainring bolts.
• EB30 Sealed Bearing Bottom BracketPrecision-ground hardened steel balls. Spins better than ceramic options under BMX impact loads.
• 495 Grams TotalAmong the lightest hollow-carbon cranksets in BMX racing. Engineered weight, not stripped weight.
• Trusted 35-Year Manufacturing PartnerSame cycling-manufacturing partner that builds the Supercross Vision F1. The certs are on file. 

Sizing — Pick Your Crank Length

Crank length is rider preference and physical fit, not a "best" answer. General BMX racing guidance:

• 165mm — Shorter riders, rapid-cadence racers, riders who prioritize spin-up over leverage. Common for Junior and smaller Expert-class racers.
• 170mm — The middle ground. Most common length for Pro 20" race setups across the USA BMX circuit.
• 175mm — Taller riders, riders who prioritize leverage and power-stroke over rapid cadence. Common for Pro XL and Pro XXL setups.
• 180mm — Tallest riders, Big BMX (24" Cruiser) racers, riders maximizing leverage on long-gear setups.

If you're not sure which length is right for your fit and your race style, call us at 760-240-5266 or email sales@supercrossbmx.com. We're racers — we'll help you spec it.

Finishes

• Gloss Carbon — Show the layup. Visible carbon weave with a high-gloss clear coat. The traditional look.
• Matte Carbon — Stealth. Same carbon weave, no gloss. Sets up cleaner against most modern frame colorways and absorbs less light under stadium lighting.

Setup & Care

• Always Use Pedal WashersPedal threads bite into carbon over time without a washer. Pedal washers protect the pedal-eye from being chewed up. Non-negotiable.
• Crank Boots RecommendedKeep the ends of the crank arms clean and chip-free, especially if you're racing tracks with rocks or pedaling out of corners. Crank boots are inexpensive insurance.
• Bottom Bracket CompatibilityThe Elite Carbon Cranks ship with the EB30 sealed bearing bottom bracket. The cranks are designed for the 30mm spindle interface — don't try to swap a 24mm BB and force a fit. Use the BB they ship with.
• Frame CompatibilityThreaded Euro BB shells (the Supercross standard since 1989). All Vision F1, Vision F1x, ENVY RS7, Vision RSX, and SX450 frames are direct-fit. Most modern threaded-BB BMX frames will work — call if you're not sure.

The Vision F1 + Elite Carbon Combo

Speedline Parts and Supercross BMX share an engineering philosophy and a manufacturing line. The Elite Carbon Cranks are designed to be the perfect match for the Vision F1 and Vision F1x carbon race frames.

Same Toray carbon family. Same manufacturing partner. Same threaded Euro BB interface. The combo is engineered as a single power-transfer system from your legs through the spindle, through the arms, through the chain, to the rear wheel. No bonded interfaces. No flex points. Maximum gate-launch energy transfer to the back tire.

You can run the Elite Carbon on whatever frame you prefer — they're frame-agnostic. But if you're building the absolute fastest first-straight setup BMX makes, the Vision F1 + Elite Carbon combo is the one we'd ride ourselves.

Frequently Asked Questions