i:SY · MADE IN GERMANY
i:SY builds compact 20-inch e-bikes in two frame sizes, Compact and XXL. Both are adjustable for virtually everyone, with no S, M, L or XL.
Quick choice
Four common directions, each with a strong starting choice. Still not sure? Try the model finder in four questions.
Daily commuting, low maintenance
E5 ZR F
€4,199
Bosch 75 Nm, Gates belt, Compact frame. The reliable all-rounder for every day.
Book a test rideTall and heavier riders (185 to 210 cm)
XXL E5 ZR F
€4,399
Larger frame, different character. Up to 180 kg total weight, adjustable from 170 cm.
Book a test rideChildren or cargo
P12 ZR Longtail
€6,999
Extended rear rack for two child seats. Prefer cargo at the front? Also check out the Cargo P12 ZR.
Book a test rideAs light as possible
Skyfly S10
from €4,999
Carbon frame, ~16.9 kg. One of the lightest e-bikes in the world.
Book a test rideModel finder
A quick overview below. Or let us help you choose in four questions.
| I'm looking for… | Series | Recommended model |
|---|---|---|
| Everyday city bike, low maintenance | Compact | E5 ZR F |
| Stepless shifting, no fuss | Compact | N3.8 ZR CX Auto Comfort |
| As light as possible, premium feel | Skyfly | Skyfly S10 |
| Most powerful Bosch motor (2026) | Skyfly | Skyfly E5 ZR F PX |
| Adventurous riding, unpaved roads | Adventure | E5 ZR F CX Adventure |
| Tall rider (185 to 210 cm) | XXL | XXL E5 ZR F |
| Minimal maintenance, 12 gears | Pinion | P12 ZR Adventure |
| Fast cycling (45 km/h, S-Pedelec) | Speed | SPEED XXL P12 ZR |
| Carrying children on the rear rack | Longtail | P12 ZR Longtail |
| Large load at the front, cargo-bike style | Cargo | Cargo P12 ZR |
Help choosing
Four questions, one minute. You'll have a direction.
The brand
i:SY is a German brand for anyone who wants a light, manoeuvrable e-bike that combines city and distance riding without compromising on quality. Every model rides on 20-inch wheels, has a low-maintenance Gates belt drive and is powered by Bosch or Pinion.
The smartest thing about i:SY is its simplicity: two frame sizes instead of five. The Compact fits riders from 150 to 185 cm, the XXL riders from 185 to 210 cm. Those are guidelines, not limits. Thanks to the adjustable handlebar, saddle and stem, someone who is 1m60 can ride an XXL comfortably. They are really two different bikes, each with their own character.
Assembled in St. Ingbert (Saarland) by KETTLER Alu-Rad, a factory of 62,000 m² with more than 300 employees and a capacity of 130,000 e-bikes per year.
All series
Series 1
Every day. Every weather. Every rider.
The Compact series is the heart of the i:SY range. Strong, reliable and built for daily use in the city and on cycle paths. With Bosch motors from 50 to 85 Nm and a Gates CDX belt drive.
| Model | Motor | Battery | Price |
|---|---|---|---|
| S8 ZR F | Bosch Active Line Plus (50 Nm) | 545 Wh | €3,899 |
| E5 ZR F | Bosch Performance Line (75 Nm) | 545 Wh | €4,199 |
| E5 ZR F Touring | Bosch Performance Line (75 Nm) | 545 Wh | €4,499 |
| E5 Century Special Edition • In stock | Bosch Performance Line (75 Nm) | 545 Wh | €4,999 |
| N3.8 ZR | Bosch Performance Line (75 Nm) | 545 Wh | €4,399 |
| N3.8 ZR CX Auto Comfort | Bosch Performance CX (85 Nm) + AUTOMATIQ | 800 Wh | €4,999 |
Featured in the webshop
Series 2
Light and strong.
The Skyfly series is i:SY's top range: carbon frame, weight under 20 kg, and the latest Bosch motors. For anyone seeking the perfect balance between weight, power and riding experience.
| Model | Motor | Weight | Price |
|---|---|---|---|
| Skyfly S10 | Bosch Performance SX (55 Nm) | ~16.9 kg | from €4,999 |
| Skyfly E5 ZR F SX | Bosch Performance SX (55 Nm) | ~18.8 kg | €5,599 |
| Skyfly E5 ZR F CX | Bosch Performance CX (85 Nm) | ~19.6 kg | €5,799 |
| Skyfly E5 ZR F PXNew 2026 • Very limited availability | Bosch Performance PX (up to 90 Nm) | ~19.7 kg | €5,599 |
Featured in the webshop
Series 3
On the road and beyond.
The Adventure series combines the compact i:SY frame with off-road components. Suntour fork suspension, Bosch Performance CX motor (85 Nm) and the larger 800 Wh battery for those who want to ride further.
| Model | Motor | Battery | Price |
|---|---|---|---|
| S10 Adventure | Bosch Performance CX (85 Nm) | 545 Wh | €4,799 |
| E5 ZR F CX Adventure | Bosch Performance CX (85 Nm) | 800 Wh | €4,999 |
Series 4
Larger frame, different character.
The XXL is not a scaled-up Compact, but a different bike. Officially designed for riders of 185 to 210 cm, but thanks to the adjustable handlebar and saddle, riders from 170 cm can also ride it comfortably. Carries up to 180 kg total weight.
| Model | Motor | Battery | Price |
|---|---|---|---|
| XXL N3.8 ZR | Bosch Performance Line (75 Nm) | 545 Wh | €4,599 |
| XXL N3.8 ZR CX Auto Comfort | Bosch Performance CX (85 Nm) + AUTOMATIQ | 800 Wh | €5,599 |
| XXL E5 ZR F | Bosch Performance Line (75 Nm) | 545 Wh | €4,399 |
| XXL E5 ZR F CX Adventure | Bosch Performance CX (85 Nm) | 800 Wh | €5,299 |
| XXL P12 ZR | Pinion MGU (85 Nm) | 800 Wh | €6,199 |
| XXL P12 ZR Adventure | Pinion MGU (85 Nm) | 800 Wh | €6,399 |
Featured in the webshop
Series 5
The motor. The gearbox. In one unit.
The Pinion Motor.Gearbox.Unit (MGU) is the most advanced drivetrain in the i:SY range. Motor and gearbox combined in one sealed unit: 12 gears, 85 Nm, 600% gear range.
| Model | Type | Battery | Price |
|---|---|---|---|
| P12 ZR | 25 km/h | 800 Wh | €5,999 |
| P12 ZR Adventure 800 | 25 km/h | 800 Wh | €6,199 |
| P12 ZR LongtailNew 2026 | 25 km/h, longtail | 800 Wh | €6,999 |
The fast S-Pedelec version is a separate bike: see series 8, SPEED.
Series 6
Compact and manoeuvrable for heavy loads.
The i:SY Cargo is a Long John cargo bike on 20-inch wheels. Compact, manoeuvrable and more powerful than it looks. With Bosch Cargo Line or Pinion MGU and a modular loading area.
| Model | Drive | Loading area | Price |
|---|---|---|---|
| Cargo N3.8 ZR Maxi | Bosch Cargo Line + Enviolo CVT | 60 cm | €5,599 |
| Cargo P12 ZR | Pinion MGU 12-speed | 40 cm | €6,999 |
| Cargo P12 ZR Maxi | Pinion MGU 12-speed | 60 cm | €7,299 |
Featured in the webshop
Series 7
The family bike. Compact enough for every day.
The i:SY P12 ZR Longtail is the newest addition to the range and an immediate hit: a fully suspended longtail cargo bike on 20 inches that rides almost as nimbly as a regular bike. With an extended rear rack of 70 cm, there is room for two child seats or a Eurobox. The Pinion MGU drivetrain and 800 Wh battery will take you anywhere.
| Model | Drive | Battery | Price |
|---|---|---|---|
| P12 ZR LongtailNew 2026 | Pinion MGU 12-speed (85 Nm) | 800 Wh | €6,999 |
Magura MT-C 4-piston brakes • Schwalbe Pick-Up tyres • 100 lux headlight • frame lock • Gates CDX belt
Featured in the webshop
Series 8
The car replacement. Up to 45 km/h.
The SPEED XXL P12 ZR is a full speed pedelec: assistance up to 45 km/h, built on the powerful Pinion MGU platform with 85 Nm and 800 Wh. For anyone who covers a longer daily commute and wants to leave the car at home: as fast as a car over city distances, without traffic jams, parking or fuel. The spacious XXL frame keeps you comfortable, even on longer rides.
| Model | Type | Battery | Price |
|---|---|---|---|
| SPEED XXL P12 ZR | S-Pedelec 45 km/h | 800 Wh | €6,799 |
Important for SPEED models: A speed pedelec provides assistance up to 45 km/h. In Belgium it is classified as a moped class P. You need, among other things, a valid driving licence, SP number plate and approved helmet.
Frequently asked questions
What is a Gates CDX belt?
A Gates CDX belt replaces the traditional bicycle chain. Benefits: no lubrication needed, no rust, quieter, longer lifespan. Ideal for daily use and bad weather.
What is Enviolo CVT?
Enviolo is a hub drive with infinitely variable gearing. You don't shift from 1 to 2 to 3; the bike continuously adjusts the ratio. Smoother transition when accelerating.
What is Enviolo AUTOMATIQ?
The AUTOMATIQ version shifts fully automatically based on your pedalling frequency (cadence). You just ride, and the bike does the thinking.
What is the Pinion MGU?
The Pinion Motor.Gearbox.Unit combines motor and gearbox in one sealed unit. 12 gears, 600% gear range, no external cables. Maximum reliability.
What is an S-Pedelec?
A speed pedelec provides assistance up to 45 km/h. In Belgium it is classified as a moped class P. You need, among other things, a valid driving licence, SP number plate and approved helmet.
What does an 800 Wh battery mean?
Wh (watt-hours) is the energy capacity. An 800 Wh battery has ~40% more range than 545 Wh. Useful for longer rides, heavier terrain or lots of luggage.
Which Bosch motor do I need?
| Motor | Nm | Application |
|---|---|---|
| Active Line Plus | 50 Nm | Relaxed commuting, flat terrain |
| Performance Line | 75 Nm | Daily use, some hills |
| Performance SX | 55 Nm | Lightweight (Skyfly), smooth riding |
| Performance CX | 85 Nm | Hilly terrain, adventurous |
| Performance PX New 2026 | 85 Nm standard, up to 90 Nm | Latest Bosch motor, touring & sporty |