Three frames came before the first motor.
Two of us went looking for one e-bike that suited a rider of 163 cm and a rider of 193 cm. Everything on sale was advertised with a peak-watt number and built in a single size. So we started at the other end — with who it had to fit — and the motor came after.
Every figure on this page is measured rather than marketed. How we measure
A bike that does not fit is not a cheaper bike. It is the wrong bike.
In 2019 two of us went shopping for the same thing: an e-bike that could do a commute in the week and a forest track at the weekend. One of us is 163 cm. The other is 193 cm. Every shop had one frame in one size, a poster with a large number on it, and a shrug.
The number on the poster was almost always peak watts — the figure a motor can hold for a few seconds before it protects itself. It tells you nothing about a hill. Meanwhile the figure that decides whether you will enjoy the bike at all, the one that cannot be adjusted away with a seatpost, was not printed anywhere: who it fits.
So we started at the other end. Three frames first, covering 158 to 200 cm without a gap. One battery, one charger and one display family across all three, so a spare part is a spare part and a review of one bike is worth reading before you buy another. And a rule we have not broken since: no number on this site that we cannot reproduce in the workshop.
We would rather lose a sale to the fit band than take one back through it.
Seven years, on one scale.
Five stops, and every one of them ends in a fact rather than an adjective.
- 2019Two riders, one problemA 163 cm rider and a 193 cm rider try to buy the same bike and cannot. The first sketch is a geometry table, not a frame.
- 2020The first three framesStep-through, high-thru and a long-reach fat-tyre frame. The fit band is set at 158–200 cm and has not moved since.
- 2021K01 TITAN X shipsA 500 W rear hub motor with a torque sensor at the bottom bracket, and 960 Wh of Samsung cells, to EN 15194. The first hundred bikes are assembled by four people.
- 2023A workshop you can walk intoStandard parts and open fasteners, so any bike shop can service it.
- 2026Three bikes, one systemK01, K02 and K03 share the pack, the charger and the display family. One warranty: two years on the frame, one on the motor and battery, from the day it arrives.
Five choices, with their price attached.
Not values — decisions. Anyone can list what they believe; this is the column that says what believing it cost.
A frame cannot be adjusted into fitting. Three geometries cover 158–200 cm with two deliberate overlaps, at 178 and 190 cm, where we name both bikes instead of guessing for you.
At 178 and 190 cm two frames fit. We name both and say what decides it — step-through convenience, or trail geometry.
Three sets of tooling, three inventories, and a size of every frame-specific part sitting on a shelf for years.
A cadence sensor asks whether the pedals are turning. A torque sensor asks how hard you are pushing. The K01 and the K02 read torque at the bottom bracket; the K03 reads cadence, because a dual-motor fat-tyre bike is ridden differently and we say so rather than implying one architecture across the line.
A dearer bottom bracket on two of the three, a calibration step that cannot be hurried, and a spec sheet that has to explain a difference instead of hiding it.
48 V, 20 Ah, 960 Wh of Samsung cells — keyed and removable, identical on all three bikes. One spare, one charger, one service part — for years, not for a season.
The K03 carries a pack sized for the other two, and a little more weight than a fat-tyre bike strictly needs.
Certification is the floor. Every configuration is also ridden loaded, in the rain, up the same hill, by someone who will have to answer the email if it disappoints.
Weeks between a finished sample and a bike we are willing to sell, every single time.
Standard fasteners and catalogue parts, so the nearest bike shop can work on it. A bike only its maker can repair is a bike with an expiry date.
No proprietary-parts margin, and a partner network we pay to train rather than a lock-in we could charge for.
Four sentences that cost us money.
We publish rated power and torque. Peak is a number a motor can hold for six seconds, and quoting it sells a bike that disappoints on the first hill.
All three are supplied set for EU road use — 250 W continuous, assistance to 25 km/h — and all three ship with a throttle, because the factory builds no configuration without one. How a throttle and a national classification interact differs by member state, so we answer that per country, in writing, rather than printing a badge on a page.
Range is measured in eco assist, flat, 20 °C, 75 kg rider — and the conditions are printed next to the number every time it appears.
If you are 155 cm or 205 cm we will say so and lose the order. A returned bike costs less than a rider who never enjoys it.
Every number on this site, with its conditions.
A range figure without its conditions is a wish. These are the conditions ours are taken under, and they are printed next to the number wherever it appears.
| Figure | What we publish | Measured under |
|---|---|---|
| Range | 55 km · K01, K02 35–45 km · K03 |
Guide figures on a full charge — cold, hills, wind, load and higher assist take kilometres off. |
| Top assist speed | 25 km/h | Where assist stops. All three are supplied set for EU road use, 250 W continuous; the bike itself is not limited. |
| Battery | 960 Wh · 48 V 20 Ah | Samsung cells, measured at the pack terminals rather than off the cell datasheet. |
| Charge time | 6–8 h | From empty to full on the supplied charger, at room temperature. |
| Load | 200 kg · K03 | Rider, luggage and rack together, to EN 15194 loading. |
Marketplace listings quote the same figures. Where a market requires a different assist limit, the product page states that limit rather than this one.