1.75 kg. As light as a water bottle. 120 Nm of torque. IP55 protection. Turn your bike into an e-bike with zero compromises.
The lightest mid-drive in the world: 1.75 kg for 120 Nm. Every gram saved means real responsiveness and control.
Designed and assembled in Italy, home of Ducati and Ferrari. Hand-picked components built to last.
Four mounting systems — Standard, Medium, Long, Hybrid — for every frame. It adapts to your bike, not the other way around.
1.75 kg of torque-sensing engineering. It delivers 120 Nm without ever calling attention to itself, and comes off in 5 minutes with 3 bolts.
It delivers power based on the real force on the pedals: natural, progressive, never abrupt.
Install it once, then take the motor off and put it back on in minutes. Your bike stays a regular bike.
It's not just the lightest. It's engineered to go where other kits struggle — and to keep your bike a bike.
The motor sits well above the bottom bracket: protected from rocks and obstacles on the trail, where bulky kits scrape and get damaged.
Off-road safeIt keeps the same chainline as your original bike: precise shifting and no dropped chain. It respects the drivetrain you already have.
Clean shiftingThe motor has its own sprocket: it can spin at a different ratio from your pedaling, so your bike's original chainring never wears down.
Less wearThe freewheel cancels all resistance when the motor is off: with a dead battery you pedal like a regular bike, no drag at all.
Pedal like before175 mm on a BSA 68 bottom bracket: the pedals stay at the right distance apart. No wide-legged stance, no discomfort — your bike's biomechanics stay intact.
Natural pedalingA torque sensor on the chain tensioner measures the actual force you apply: progressive, natural assistance, never jerky. Sinusoidal FOC controller, whisper-quiet.
Torque-sensingLightest isn't a native e-bike: it's a conversion kit that transforms the bike you already own. It works on virtually any frame — from city bikes to cargo bikes, all the way to a 270 kg New York pedicab. Here's how to find out in thirty seconds.
Five mounting systems (Standard, Medium, Long, Hybrid, Inframe) cover a range of geometries and tube diameters. If you can ride it, Lightest probably fits it.
No welding, no permanent modifications. The motor bolts onto the bottom bracket with a dedicated bracket kit, plus an external battery on the frame.
In the vast majority of cases the answer is yes. Check these three points and you're good to go.
Upload a photo of your bike and our AI instantly tells you which mount and which batteries you can install, along with a confidence score. No sign-up for your first result.
In cycling, weight is the most expensive thing you can buy. Dropping 2-3 kg from a bike with top-tier components costs thousands. Lightest weighs 2-3 kg less than other kits: that advantage is already built into the motor.
The same weight savings you'd pay thousands for in components is part of the world's lightest mid-drive — 1.75 kg. You don't add dead weight to your bike: you stay light.
Indicative market values for weight-saving upgrades: weight and price vary with bike and components. Lightest: 1.75 kg, 2-3 kg lighter than competing mid-drive kits.
That's the crossroads you're facing. But if you own a quality analog bike, the frame and components you chose are worth keeping: with Lightest it becomes a premium eBike — lighter, reversible, and often for less than a new one, where at that price the components are compromised to make room for a motor and battery.
| Feature |
Convert yours
Lightest
Best choice
|
Buy it all again
New eBike
|
Convert yours
Other kits
|
|---|---|---|---|
| Keep YOUR bikeFrame and components stay yours | |||
| Motor weightHow much the system weighs | 1.75 kg | 3.5–4 kg | 4–5 kg |
| RefinementTorque-sensing · IP55 · Made in Italy | Standard | Depends on the model | Rarely |
| Remove/refit the motor in 5 min3 bolts, no modifications | |||
| PriceTo go electric | from€ 800 | a whole new bike€ 2,500–13,000 | often less, but+2–3 kg |
A quality analog bike has a frame and components you chose yourself. Convert it with Lightest and you get a premium eBike — lighter and often for less than a new one, where at the same price the components get compromised to make room for a motor and battery. And whenever you want, it's back to a normal bike in 5 minutes.
Indicative market values: weight, price, and quality vary depending on the bike, model, and components chosen. Lightest: 1.75 kg, 120 Nm, IP55, Made in Italy.
See the full conversion-kit comparison (Lightest vs Bafang, CYC, Swytch, Pendix…) →
Power, torque, speed, battery, and range that update in real time — then the details and your quote. Choose a power level to open the interactive configurator.
Five mounting solutions engineered for a perfect fit on any frame.
Zoom motorUniversal down-tube mounting. Compatible with most MTB and gravel frames. Installs in under 30 minutes.
Zoom motorDesigned for fat bikes and full-suspension frames with a compact triangle. An extended bracket that keeps the center of gravity low and centered.
Zoom motorFor frames with long or curved tubes and enduro/downhill geometries. Maximum rigidity even on the most demanding travel.
Zoom motorA hybrid solution for frames with special geometries. Maximum versatility with no permanent modifications to the frame.
Zoom motorFully integrated into the frame for a clean, pro-grade look. The aesthetic of a native eBike with the freedom of a kit.
Upload a photo of your bike and our AI tells you in real time the right mount — and which batteries fit — with a confidence score. No sign-up for your first answer.
From a regular bike to an eBike in four moves. No permanent changes to the frame: your bike stays a bike.
Attach the mounting system to your frame with just 3 bolts. Universal, reversible, no drilling or welding.
3 boltsThe world's lightest mid-drive clicks onto the bracket. 120 Nm of torque with torque-sensing, IP55 protection.
1,75 kg · 120 NmThe drivetrain links the motor to your pedaling. Clip on the external battery you chose for your range.
Battery 220–960 WhConnect the Superhero Pack: assistance levels, PIN anti-theft, RACE mode and real-time telemetry.
Superhero PackThe kit arrives ready to go. With the steps above, you complete the first install comfortably at home in about 1–2 hours (depending on your experience and skill), with no special tools. After that, take the motor off and put it back on in 5 minutes.
In Italy we offer complete installation. A technician validates the correct mount for your frame and fits everything to a professional standard.
Three capacities for every need. From the daily commute to a mountain adventure.
Light and discreet. Perfect for city routes and short range up to 60km.
220 Wh
The right balance of weight and range. Up to 120km on mixed routes.
580–700 Wh
Maximum range for your longest days. Up to 160km on a single charge.
960 WhThe kit connects to your smartphone via Bluetooth: monitor range, power and performance in real time. With the Superhero Pack you unlock advanced control — custom levels, RACE mode, anti-theft and telemetry.
Set up to 5 assistance profiles. From eco to full-power, with a single tap.
Speed, cadence, torque delivered, motor temperature and battery status.
Your kit keeps getting better over time with over-the-air firmware updates.
Motor Valley engineering. Motorsport-grade quality standards.
European compliance across all components. Approved for road use.
Support directly from the manufacturer. Spare parts guaranteed and always available.
Delivery across Europe. Dedicated tracking and professional packaging.
Legal, reversible, light. The answers that matter, no beating around the bush — before you convert your bike.
Yes. In its 250 W setup with assistance up to 25 km/h and a pedaling sensor, Lightest falls into the EPAC EN 15194 category: it's treated as an ordinary pedal-assist bicycle and rides with no plate, license or insurance.
The more powerful tiers (500/750/1000 W) and RACE mode, which unlocks 45 km/h, are intended exclusively for use on private land or closed circuits.
It fits your regular bike: Lightest is a retrofit conversion kit, not a native e-bike. Five mounting systems — Standard, Medium, Long, Hybrid and Inframe — cover nearly every frame.
City bikes, MTBs, gravel, fat bikes, cargo bikes and even recumbent trikes: it adapts to your bike, not the other way around. See all 5 mounts →
Anyone can do it, but the first time takes a little longer. The full first installation (bracket, battery mount, chain and setup) typically takes 1–2 hours depending on your experience and hands-on skill. Once the bracket and battery mount are on the bike, taking the motor off and putting it back on is a matter of 5 minutes and 3 bolts.
In Italy we also offer full-service installation: ship it to us or drop it off, and we hand it back ready to ride.
Completely reversible. The 3-bolt mounting requires no welding and no drilling on your frame: once the kit comes off, your bike is exactly as it was.
You can also move the same Lightest from one bike to another in just a few minutes.
Yes. Lightest has IP55 protection: protected against dust and water splashes. You can ride in the rain, on gravel and through mud without a second thought.
It's designed and assembled in Motor Valley, the birthplace of Ducati and Ferrari, to motorsport-grade quality standards.
It depends on the external battery you choose (from 220 to 960 Wh) and your assistance level. As a rough guide:
• up to about 60 km with the compact battery (220 Wh)
• up to about 120 km with the touring (700 Wh)
• up to about 160 km with the maxi (960 Wh).
Rider weight, elevation gain and riding mode all affect real-world figures. Choose your battery →
The warranty is 2 years, with support directly from the manufacturer.
Spare parts are guaranteed and always available: because it's Made in Italy, the entire support chain is ours.
Yes. You have the right to return it within 14 days of delivery, as provided by European regulations on online purchases.
We'll refund the product returned in its original condition.
Kits start at around € 800. Lightest is the world's lightest mid-drive: 1,75 kg for 120 Nm of torque.
A torque sensor (torque-sensing) delivers power naturally and progressively. It weighs 2–3 kg less than competing kits. Configure your kit →
Lightest fits the most common standards: threaded BSA or Pressfit bottom bracket. It's a technical detail: if you're unsure, just pick “don't know” in the configurator and we'll identify it from your bike model, or from two photos.
Yes. As a mid-drive, Lightest uses the gears you already have: it multiplies torque through your ratios, making it far more efficient uphill than a hub motor. And it keeps the original chain line for precise shifting.
A mid-drive (like Lightest) drives the pedals and uses your gears: more efficient uphill, natural power delivery, weight kept central and low. A hub motor drives the wheel directly: simpler but less efficient uphill, and it throws the bike's balance toward the wheel.
The Lightest motor, controller, mounting bracket, drivetrain and torque sensor. The battery, app (Superhero Pack), throttle and sensors are options you choose in the configurator based on your needs.
The battery is external and attaches to the frame tubes or the rear rack. Choose a capacity from 220 to 960 Wh based on the range you need: it isn't integrated into the frame like on a native e-bike.
The motor weighs 1,75 kg. The complete 250W kit with battery adds about 4 kg to the bike: still 2-3 kg less than competing conversion kits.
Little, but not none. It's a mechanical drivetrain with a torque sensor—rugged and simple—and your bike's routine care stays exactly as before. The manual also includes the recommended maintenance schedule—periodic checks of chain, tension and torque—to keep the kit at its best over time.
Yes, it's transferable. If the other bike already has the bracket and battery mount installed, you move the Lightest over in about 5 minutes (3 bolts). If it's the first installation on that bike, plan for 1–2 hours depending on your experience and hands-on skill. The same Lightest can serve several bikes: all you need is the right mount for each frame.
No, quite the opposite. Lightest's low weight doesn't come from smaller or cheaper components, but from engineering choices that optimize performance and from innovative solutions that cut bulk and weight while keeping the same strength. The key example: the motor transmits power through its own output pinion, which spins much faster than the chainring—about 3 times the RPM. By running at high speed, we can eliminate the final reduction stage, the largest and heaviest part of a drivetrain, without giving up torque at the wheel. Less mass and fewer stressed components also mean fewer wear points: lighter, and just as reliable.
Lightest starts from a structural advantage: 1,75 kg versus roughly 4 kg for the BBSHD and over 5 kg for the Ultra M620, and it's torque-sensing as standard, with power delivery proportional to your pedaling—the most common Bafang units (BBS02/BBSHD) instead work with an on/off cadence sensor. By eliminating the final reduction stage (its own pinion at ~3× RPM), Lightest cuts mass and wear points, with more refined electronics and lower noise.
Where the motor sits matters too: Lightest doesn't take the place of the bottom bracket and doesn't hang down low, so it preserves ground clearance even on frames with a curved down tube—where the Bafang stays very low and risks striking rocks and bumps. And it leaves the chainring free: the Bafang requires a chainring larger than the motor body (no small chainrings, less nimble ratios uphill), Lightest doesn't.
Finally, the mounting: Lightest anchors to the frame with a support point that is wide and well away from the bottom bracket, spreading pressure over a larger surface—ideal even for carbon frames, which are sensitive to concentrated loads.
Lightest and the TSDZ share the same philosophy—a torque-sensing mid-drive—but Lightest takes it further. It weighs nearly half (1,75 kg versus ~3,3–3,6 kg) and uses advanced polymer gears that minimize wear: on the TSDZ, the reduction gear is instead a well-known weak point, often swapped for the brass version. Lightest's torque sensor and thermal management are engineered to last, too—no open-source firmware required.
Lightest also leaves the chainring free—the TSDZ, like the Bafang, forces a chainring larger than the motor mount—and attaches with a mount that is wide and well away from the bottom bracket, distributing loads better and ideal even on carbon. All with official EU support and warranty.
The CYC delivers a lot of power, but Lightest is all about lightness and balance: about 4 kg for the complete kit versus ~7 kg for the Photon (motor ~3,7 kg). Lightest's power delivery is progressive and smooth and respects the bike's original chain line; the CYC's very aggressive torque, by contrast, is often reported as harsh on shifting and hard on the cassette and chain. The result is a more natural ride and a drivetrain that lasts.
Compared with the leading conversion mid-drives—Bafang BBSHD/Ultra, TongSheng TSDZ, CYC Photon, ToSeven DM02—Lightest makes a different choice: it's the world's lightest mid-drive (1,75 kg for 120 Nm), torque-sensing as standard, and the only one that eliminates the final reduction stage thanks to its own high-speed pinion. The result is 2–3,5 kg less on the bike, fewer stressed components and a bike that stays a bike—with EU support and warranty. Configure your kit →