Stop replacing.Start upgrading.

The FluxKit turns the bike you already own into a fast, long-range e-bike. Same frame. Same fit.

You're on the list. Check your inbox to confirm your spot.

Waitlist members get first crack at the $499 Super Early Bird — and a 30-minute head start when we launch on Kickstarter.

The HyperFox FluxKit: hub-motor wheel, battery, display, radar and controller

The complete system • Installed on your bike

Complete HyperFox FluxKit system: LCD display, controller, cadence sensor, battery and hub motor

In the box

Geared hub motor

Drops into your wheel, with regenerative braking to recover energy.

Smart battery · 480Wh

Removable pack that doubles as a powerbank. Up to 100 km range.

LCD display

Real-time speed, range and assist level, right on your bars.

Forward radar

Reads the road ahead and can trigger regenerative braking.

Cadence sensor

Natural pedal assist that responds smoothly as you ride.

Mobile app

Lock, track and control your ride from your phone.

In motion • What it does

Three things you'll feel on every ride.

Cyclist riding with forward road awareness

01 — FluxSense

Eyes on the road ahead

Forward-facing radar reads the space in front of you and can trigger regenerative braking as you approach an obstacle. Awareness, not autopilot — you stay fully in control.

A rider-assist and awareness feature, not a collision-avoidance system.

Bike demonstrating regenerative braking in motion

02 — Regenerative braking

Every slowdown earns range back

When you ease off or brake, the motor feeds energy back into the battery instead of wasting it as heat. On a hilly commute, that adds up to real extra distance.

03 — Smart battery

Power that comes with you

The 480Wh pack locks to your frame and lifts off in a second, so you charge it anywhere. It doubles as a powerbank for your phone or lights when you're off the bike.

How it works • Three steps

From regular bike to e-bike, in an afternoon.

Pop off your wheel

Release the wheel you have now. Standard tools, no special skills.

Drop in the FluxKit

Fit the motor wheel, clip on the battery, mount the display.

Ride

Power on, pick your assist level, and go further than you did yesterday.

Why HyperFox

Built by engineers who ship hardware.

HyperFox started with a team of former drone engineers — people who've taken complex electromechanical products from prototype to production and know how hard the last 10% really is. The FluxKit is that same discipline pointed at the bike you already own. We're building in the open, and you'll see the real progress, not just the renders.

— The HyperFox team

EuroBike 2026 • Frankfurt

We showed up. Real booth, real bikes, real feedback.

We brought prototype FluxKits to EuroBike and spent three days watching people ride them, ask questions, and tell us what they actually wanted. That's what's going into the final product.

FluxKit prototype on display at EuroBike

Upgrade vs. replace • The math

Why buy a whole new bike?

Upgrade with FluxKit

$499

Super Early Bird, Kickstarter

Keep the bike you love and know
Easy install in about 30 minutes
Radar, regen and app included

Buy a new e-bike

$1,500+

Typical mid-range e-bike

Learn a whole new bike's fit and feel
Your current bike gathers dust
3× the price for similar range

Questions •

The stuff you're actually wondering.

Will it fit my bike?

The FluxKit fits 26" to 29" wheels and works with both solid-axle and thru-axle bikes, which covers the large majority of city, hybrid and mountain bikes. A quick compatibility check will be on the campaign page so you can confirm your exact bike before you back.

How hard is the install?

It's a bolt-on or thru axle install. Swap in the motor wheel, clip on the battery, and mount the display — about 30 minutes with standard tools, no bike shop required. We'll include a step-by-step guide and video.

What's the real range?

Up to 100 km on a full charge. Real-world range depends on rider weight, terrain, assist level, and weather — expect less on steep hills or into a headwind, and more on flat ground at lower assist.

Does the radar prevent crashes?

No. FluxSense detects obstacles ahead and can trigger regenerative braking. It's a rider-assist and awareness feature — not a collision-avoidance or self-braking system — and it doesn't replace attentive riding.

Is it road-legal where I ride?

Power is configured by region — 750W in the US, 250W in the EU — to meet local e-bike rules. Always check the specific regulations where you ride, as they vary by country and state.

When does it ship, and what will it cost?

The first backers get the $499 Super Early Bird on Kickstarter, with the price rising after that tier sells out. Shipping is targeted for December 2026, and backers get production updates the whole way there. Every FluxKit is backed by a 1-year limited warranty covering manufacturing defects in the motor, battery, and electronics. Full terms will be on the campaign page.

Launching on Kickstarter •

Be first in line.

Join the waitlist and we'll send your private early-bird link the moment we go live — before the public sees a thing.

You're in. Watch your inbox for your early-bird link.

No spam. One email at launch, and a couple of build updates along the way.