SkeletKey — First Folding, Electric & Modular Motorcycle

SkeletKey folding electric motorcycle — carbon steel folding frame with modular battery

The Bike

Puca — the ultimate travel companion.

Puca is built to move with you. A rigid carbon steel folding frame weighing only 9.2 lb — with dropout geometry sized to the hub motor.

It pairs with a 57 lb lock-in modular battery and a QS205 V3 (50H) spoke hub motor (4,000–5,000W continuous, 12,000W peak, 28.6 lb / 13.0 kg).

Folding frame: 9.2 lb carbon steel. Hub motor: 28.6 lb. Top speed 70 mph. Over 100 miles of real-world range at 45 mph. Folds for apartments, trunks, and trains.

Store Puca in your apartment, your car trunk, or on a train. Check the frame as luggage and ship the ultra-energy-dense 57 lb battery separately when you explore the world. Commute without gas — and save thousands a year.

True 100-mile electrics start around $10,000; the closest competitors are still ~$3,000 more than Puca at $6,999 — and they don’t fold, don’t lock in a modular pack, and can’t travel with you.

100+

Miles of range

~70

mph top speed

QS205 V3

4–5 kW / 12 kW peak

9.2 lb

Carbon steel folding frame

57 lb

Lock-in battery module

350

Wh/kg NMC+ cells

9.2 lb carbon steel folding frame · 28.6 lb hub motor · 57 lb modular lock-in pack · 350 Wh/kg semi-solid NMC+ under long-term supply contract

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Range & Specs

The only sacrifice is 10 mph.

Puca matches the range of expensive non-folding competitors while undercutting them by thousands — with a 9.2 lb carbon steel foldable frame, 57 lb lock-in modular battery, contracted 350 Wh/kg semi-solid NMC+, and real travel flexibility they simply do not have.

	SkeletKey	Typical $10k Competitor
Real-world range	100+ miles	~100 miles
Top speed	~70 mph	~80 mph
Hub motor	QS205 V3 (50H) · 4–5 kW / 12 kW peak · 13.0 kg	Varies
Folds for storage / travel	Yes	No
Modular quick-swap battery	Yes	No
Price	$6,999	$10,000+
Apartment / transit friendly	Yes	No

Fold & Travel

Puca goes where other motorcycles can’t.

A 9.2 lb carbon steel folding frame and 28.6 lb hub motor that still fold with the bike — plus a 57 lb lock-in pack you can remove and ship on its own. Apartment, trunk, train, or checked luggage. No other long-range electric motorcycle offers this freedom.

Apartment Living

Fold it and roll it into the elevator. Store the chassis inside; keep the 57 lb pack charged and ready. No garage required.

Trains & Transit

Carry the folded frame onboard. The modular lock-in battery travels separately when rules require — something fixed-pack bikes can’t do.

Car Trunk & Luggage

Fits in a trunk or checks as frame luggage. Ship the ultra-dense 57 lb battery separately and explore the world without a car.

Commute Savings

Skip gas. Save thousands a year on commuting while keeping highway-capable speed and 100+ mile real-world range at 45 mph.

Battery Technology

57 lb lock-in modular pack. 350 Wh/kg semi-solid NMC+.

The heart of Puca is a 57-pound lock-in modular battery — not a fixed brick. We have already secured a long-term supply contract for semi-solid NMC+ cells at 350 Wh/kg, delivering exceptional energy density so the pack stays light enough to remove, ship, and swap.

That density still supports 100+ miles of real-world range at 45 mph and 8 kW CCS1-compatible fast charge — about 20% → 80% in 30 minutes.

NMC pouch cells stacked next to an open modular battery pack module

Large-format NMC pouch cells and modular pack assembly — the energy core of SkeletKey

350 Wh/kg Semi-Solid NMC+ — Under Contract

Large-format semi-solid NMC+ pouch cells at 350 Wh/kg in a 16S2P layout deliver a nominal 60.8V pack with approximately 8.5 kWh of usable energy.

A long-term supply contract is already in place for this chemistry — locking in the density that makes a true long-range pack possible at only 57 pounds.

Integrated Bluetooth BMS app control reports cell health, state of charge, and faults live.

8 kW Fast Charge — CCS1 Worldwide

Charge at up to 8,000 watts on the growing global CCS1 fast-charge network — or use an ultra-compatible Tesla charger path with a CCS1 adapter where supported.

Typical session: roughly 20% to 80% in about 30 minutes at 8 kW, so you’re back on the road without a long layover.

Pair with the Bluetooth BMS app to monitor charge rate, temperature, and limits in real time.

Isolated Exoskeleton Cradle

To protect the central folding hinge, the battery never sits inside the frame cavity. It rides in an isolated structural exoskeleton cradle on the non-folding rear triangle — between the seat and the rear carriage.

Modular Lock-In Mechanism — 57 lb

This is not a loosely seated tray. Two thin carbon steel aluminum guide rails form the cradle sides. The 57 lb module slides in and locks until positive and negative contacts mate with quick-connect terminals.

Dual over-center cam latches secure it — mechanical retention and electrical connection in one motion. Rigid at 70 mph. Off in seconds when you fold, store, or ship the pack separately.

carbon steel Frame Contract

Parallel to the battery program, the production folding frame is carbon steel at 9.2 lb, with dropout geometry matched to the hub motor.

The measured frame weight is 9.2 lb; the hub motor is 28.6 lb. Geometry stays aligned with Puca’s ride and fold requirements.

350

Wh/kg NMC+

16S2P

Cell layout

~8.5 kWh

Pack energy

57 lb

Module weight

60.8V

Nominal voltage

8 kW

CCS1 charge

~30 min

20% → 80%

BT BMS

App control

1.

Align

Guide the pack between the two thin aluminum side rails under the seat.

2.

Slide

Push forward until the positive and negative contacts fully engage the quick-connect terminals.

3.

Lock

Close the dual over-center cam latches. The pack is now mechanically locked and electrically live.

4.

Swap

Release the latches and slide the pack out. Swap in a charged module in under 30 seconds.

Fast Charge

CCS1 nationwide. Tesla with adapter. 20% → 80% in ~30 min.

Puca charges at up to 8,000 watts on the growing CCS1 DC fast-charge network — and on Tesla Superchargers using a CCS1 adapter where supported. Typical session: about 20% to 80% in 30 minutes.

Want to charge at home? Install a CCS1 charger into your breaker box, or plug in a 62.9 volt AC to DC charging brick to charge overnight using your 120V or 240V household outlet. You can charge anywhere that has a standard household plug.

Public CCS DC fast charging station pedestal — Typical CCS / DC fast pedestal at retail and highway sites.

Row of Tesla Supercharger stalls at dusk — Tesla Supercharger stalls — nationwide coverage expanding every year.

Scroll to load map…

Global network · Tesla Superchargers + CCS (≥3 kW) — Red = Tesla · Blue = CCS. Opens at your location; pan or use region buttons for the rest of the world. Pins are real stations and fill the view as you move. Puca ships by plane anywhere customs allows. Curated layers in Google Earth.

Smart Display

Your smartphone is the dash.

No proprietary screen. Strong magnets hold your phone on the dash. Pair over Bluetooth, open the app, and ride with live speed, range, and system data — while Maps and music run in the background.

Smartphone magnetically mounted on the SkeletKey dash showing speedometer, range, and Google Maps navigation

Magnetic dash mount · live speed, range, and navigation on your phone

Magnetic mount

Strong magnets and an included magnetic ring keep your phone locked through real-world riding. Attach and detach in one motion.

Bluetooth + app

Pair once. The app becomes your speedometer, range meter, and live system readout — updating dynamically as you ride.

Maps & music

Open Google Maps in the background for navigation, or stream music while you ride. Your phone stays the interface you already know.

Park & store

Detach from the magnet, remove the battery, and store the 9.2 lb carbon steel folding frame anywhere — elevator, closet, trunk, or train.

Maintainability

Built to open, not to lock you out.

SkeletKey ships with complete documentation and an easy-to-read wiring chart covering turn signals, brake lights, throttle, ignition, cutoff switch, and headlamp — all accessible through the dashboard app on the phone that magnetically docks to the bike.

Full documentation & wiring chart

Every electrical path is documented. Turn signals, brake lights, throttle, ignition, cutoff switch, and headlamp are mapped in a clear chart you can follow from the app or the printed guide — so diagnosis and upgrades don’t require guesswork.

Wireless transmitter, cleaner fold

A reliable, waterproof wireless transmitter replaces the old tangle of multi-foot harnesses across the folding joint. Signals for controls and lighting cross the hinge without a thick cable bundle — keeping the chassis cleaner and the fold simpler.

Numbered connectors, easy repair

Transmitter and receiver boards use a simple diagram of numbered connectors. Swap or modify a wirelessly communicated component by matching numbers — no tracing five-foot runs of wire through the frame.

Reliable and latency-free

The wireless link is designed to be reliable and latency-free under real riding conditions. What used to be a messy harness becomes modular boards you can service, replace, or extend with confidence.

Ownership

Built for the long run.

Modular architecture, asset-light manufacturing, and a focus on real-world usability mean SkeletKey is designed to stay useful and upgradeable for years.

Modular Battery System

Quick-release latches. Swap packs in the field, travel with a spare, or upgrade capacity later without replacing the entire vehicle.

carbon steel Structural Integrity

Heat-treated aluminum delivers stiffness for stable high-speed riding while remaining light enough for true foldability.

Simple Ownership Model

Direct sales, clear pricing, and no traditional dealer markup. MSRP of $6,999.

Warranty

Battery: 3.5 years. Controller: 3 years. Coverage on manufacturing defects so you can ride with confidence.

Service

Send us the failing part — we ship a replacement. Modular design means most components swap without specialized tools or a dealer visit.

Story

From Amsterdam folding bikes to a motorcycle that travels.

The idea for SkeletKey was conceived in Amsterdam, inspired by the city’s culture of folding e-bikes — machines that disappear into apartments, trains, and daily life. The question was simple: why shouldn’t a real electric motorcycle fold the same way?

While building the first prototypes and waiting on my Dutch wife’s K-1 visa to be approved, I traveled with the frame four times back and forth. The bike had to move as easily as we did.

We’re now happily married for over two years and living in New York City. SkeletKey is the machine that came out of that journey — a folding, modular, long-range electric motorcycle built for people who refuse to choose between performance and portability.

Follow the build on Instagram → @skeletkey

See how I've transformed every company I've worked for by coaching up my team, motivating them, and raising the technical bar for other teams to follow our blueprint.

Zelis, newyorker.com, vogue.com, gq.com, wired.com, and over 70 international brands bring in over 100 millions of unique viewers a day due to the engine my teams built, the rich deployment pipeline, component library, style guide, and bridge building across a massive company.

Click the link below to see the breadth of my software, hardware, musical, and innovative skills and experience.

LinkedIn → Nathan McDowell

Listen to my debut album inspired by the process of building Puca, the first folding, modular, electric motorcycle.

Listen to Puca → Music

History

Iterating until the fold was light enough to matter.

Before the production plan, we built and rebuilt. Each generation of the Puca prototype taught us what to keep — and what to strip away.

Design iteration one

First complete machines proved the folding concept and long-range battery could coexist — but weight and complexity were still too high for real apartment and travel use.

Design iteration two

Those lessons became SkeletKey — focused on foldability, modular power, and the lowest practical chassis weight so the bike fits elevators, trunks, and real city life.

Work with us

Technical Co-Founder

SkeletKey is the first folding, electric, modular, affordable motorcycle — built to move between dense city gridlock and rural back roads.

We’re looking for a Technical Co-Founder to own hardware prototyping, mechanical fabrication, and EV systems as we take the machine from proven prototype to production.

What you’ll lead

Quick-detach battery enclosure — industrial-strength housing for the modular NMC+ pack that latches rigidly at speed, releases for fold and travel, and stays shock- and vibration-resistant on dual-terrain roads.
Environmental ruggedization — waterproofing and thermal paths for the controller and high-power electronics (IP-minded sealing without killing heat dissipation).
Structural integration — seat and mounting hardware that carries real load, survives potholes and dirt, and never blocks the fold.
Rapid prototyping — 3D print, fabricate, field-test, iterate. Hands-on over paperwork.

Who you are

Hardware hacker, industrial designer, or mechanical engineer who builds in the real world.
Comfortable with high-power hub motors (QS-class layouts), phase wiring, and high-amp controllers.
Experienced in enclosure design, structural fabrication, sealing (IP), or advanced additive manufacturing.
Excited about micro-mobility and shaping an early-stage vehicle — not just shipping tickets.

This is a co-founder seat

Equity and ownership are part of the conversation from day one. If you’re ready to own the physical machine with us, apply below — select Apply for Co-Founder on the contact form and tell us what you’ve built.

Apply for Co-Founder View on LinkedIn

FAQ

Common questions.

1. Do I need a motorcycle license?

Yes. SkeletKey is classified as a motorcycle — it just folds. Check your local licensing requirements for motorcycles in this power class.

2. What waterproof rating does it have?

IP65. The electrical systems and critical interfaces are designed to handle rain, road spray, and wet conditions.

3. How do I pay?

Reserve with $100. Then you have the option to pay half at order time and half before it ships.

4. Where do you ship?

Anywhere in the world, as long as customs allows it. Shipping price depends on the destination country.