Every job here has a number.
A check with no reading is an opinion, and an interval measured in months is a guess about how much you ride. So each item on this page carries the measurement that says it passed, the line where it stops being your job, and the four things that are not to be done at all.
The last figure is not a typo. The controller is outside the warranty on all three bikes. What the warranty covers
The first ride after winter
Six weeks in a hallway does nothing to a battery and quite a lot to a tyre. Start with air, end with a torque wrench.
Heat is the cold that does not come back
Cold range comes back when the pack warms up. Damage from heat stays. Summer care is mostly about where you leave the bike.
Wet roads, short days
The commute moves into the dark and the road gets slippery. Lights and brakes first, then the place the battery will spend the winter.
The battery is the job
Range drops in the cold and comes back when the pack warms. Charging a cold pack is the one thing that does lasting damage.
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Charge it full once, indoors
Bring the pack to room temperature, then charge it to 100 % before the first ride. Full is fine when you are about to use it.
The battery -
Air before anything else
Tyres lose pressure standing still, and a soft tyre feels like a weak motor. Pump to 1.4–2.4 bar0.7–1.7 bar1.4–2.4 bar0.7–1.7 bar1.7–2.8 bar.
The readings -
Measure the brake pads
Winter grit wears pads faster than summer miles. Replace at the figure in the readings table.
The readings -
Strip the winter off the chain
Clean off road salt and old lube, then lube again. A dry chain shows up as noise first and wear later.
The schedule -
One pass with the torque wrench
Stem, bars, seat post and rack bolts, to the values for your bike.
Torque values
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Not in a hot car, not in full sun
A pack left in a closed car or on a balcony at midday ages in a way no amount of careful charging undoes. Park it in the shade.
The battery -
Let it cool before you charge
After a long climb, give the pack time off the bike. Charge it between 0–40 °C0–40 °C0–40 °C0–40 °C0–40 °C.
The battery -
Check pressure in the morning
Air expands as it warms up. Set the pressure cold, before the ride, to 1.4–2.4 bar0.7–1.7 bar1.4–2.4 bar0.7–1.7 bar1.7–2.8 bar.
The readings -
Wipe the contacts
Dust and sweat collect on the battery seat. A dry cloth before you slot the pack in is the whole job.
The readings -
Full only for the long day
Charge to full the night before a big ride, not every night.
The battery
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Lights before you need them
Check the front light and every reflector in daylight. It gets dark at the evening commute sooner than you expect.
The schedule -
Pads wear faster on wet leaves
Wet grit is abrasive. Measure the pads every few weeks, not once a season.
The readings -
Dry the contacts after a wet ride
IP65IP65IP65IP56IP65 display • IP56 motor covers rain, not a socket with water standing in it. Wipe the pack seat before the battery goes back on.
The battery -
K03 RANGER only
No fenders on this bike
Spray from the front wheel reaches the battery seat and the drivetrain. Rinse with low pressure and dry after every wet ride.
Washing -
TITAN X K01 · CITY K02 only
The fenders are a gift, not a spare
Check both mounts are tight. They came free with the bike and are not replaced if they crack.
Torque values -
Decide where the battery winters
Indoors, somewhere that stays above freezing. The garage is usually the wrong answer.
The battery
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The pack sleeps indoors
Take it off at night and fit it right before you leave. A warm pack starts the ride with more of its capacity.
The battery -
Charge only between 0–40 °C0–40 °C0–40 °C0–40 °C0–40 °C
After a cold ride, bring the pack in and let it reach room temperature before the charger goes on.
The battery -
Shorter range is not a fault
Cold range loss is temporary. If range has not come back by spring, write to us.
What riders report -
Rinse the salt, then lube
Road salt eats chains and contacts. Low-pressure rinse, dry, lube. Never a pressure lance.
Washing -
Not riding for weeks?
Store the pack at 30–60 %30–60 %30–60 %30–60 %30–60 % and check it once a month.
The battery -
K03 RANGER only
Snow on fat tyres
On snow, run toward the low end of 1.4–2.4 bar0.7–1.7 bar1.4–2.4 bar0.7–1.7 bar1.7–2.8 bar for grip, and pump back up before dry roads.
The readings
Every job here is written out in full further down this page. The full schedule
A schedule in kilometres, not in months
A bike doing 20 km a day through a wet winter arrives at every one of these long before the calendar says so, and one that lives in a hallway from October to March does not arrive at all. Ride the distances; the months are only there for the bikes that are not ridden.
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Every rideThirty seconds, standing over it
Tyres pressed, brakes squeezed, battery seated and the key turned. Nothing else.
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~200 kmOr one wet week, whichever is first
Frame and motor housing wiped down with a damp cloth. Look at the chain while you are there.
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~1,000 kmThe drivetrain
Degrease, dry, re-lube. Then the torque values on this page — they are the ones that loosen.
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~3,000 kmThe wear parts
Pads, rotors, chain stretch, tyres. Spoke tension on the K01 and K02; the K03 has no spokes to tension.
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YearlyThe part that is not yours
Bearings, brake bleed, battery health report, firmware. A workshop, with the frame number.
The first stop is marked because it is always due. It is also the only one that finds the two faults that end a ride.
What passes, and where it stops being your job
Everything a rider can check on these bikes, with the number that says it is fine and the number that says replace it. The right-hand column is there because the three bikes are not the same object — one of these rows does not exist on the K03.
| Check | Passes at | Replace at | Tool | Applies to |
|---|---|---|---|---|
| Brake pad thickness | ≥ 1.5 mm of friction material | 1.0 mm | Steel rule | All three |
| Rotor thickness | Above the minimum stamped on the rotor | The stamped minimum | Vernier | All three |
| Chain wear | Under 0.5 % | 0.75 % | Chain checker | All three |
| Tyre pressure | Inside the range moulded into the sidewall | — | Gauge | All three |
| Tyre casing | No cut reaching the cords | Any cut through the casing | Eye | All three |
| Spoke tension | Even, no loose pair when squeezed | — | Hand | K01 · K02 only. The K03 runs one-piece magnesium wheels and has no spokes. |
| Battery contacts | Dry, bright, no green | — | Dry cloth | All three |
| Bolt torque | The value in the table below | — | Torque wrench | All three |
A figure with a dashed underline is provisional and stays that way until the factory wear sheet is in, because a guessed pad limit on a published page is worse than no page. A plain dash means the check has no numeric limit at all: it is a condition, not a measurement.
The one tool this page insists on
Aluminium threads give no warning before they strip, and a motor mount that has been over-tightened once does not tell you until it is loose. A torque wrench is €30 and it is the difference between servicing the bike and paying for a frame.
These come from each bike's own Torque spec metafield, so the panel changes with the bike rather than with the copy.
TITAN X K01
K03 RANGER
CITY K02
K05 FIRN
M1 ARETE
The part you can shorten by years without noticing
- FLAT 0–20 %Do not leave it here
- STORE 30–60 %Storage window
- RIDE 80–100 %Charge here before a long day
The 30–60 % window is the industry storage figure; Kimdyma has not measured it.
The pack is 48 V · 20 Ah · 960 Wh of Samsung cells and it comes off the bike with the key, which means it can spend the winter somewhere sensible instead of in an unheated shed.
Charge indoors, above freezing
A cold pack charges badly and a pack below 0 °C should not be charged at all. Bring it in, let it reach room temperature, then plug it in. The charger is 48 V 4 A and it is the same unit on all three bikes.
Dry before it is connected
IPX5 and IP65 describe rain and hose spray, not a pressure lance and not a socket with water in it. Wipe the contacts and the pack seat dry before the battery goes back on.
The cover is 12 months, and the clock is running
Motor and battery cover are 12 months from delivery; the frame is 24. Extended cover adds 12 months of battery cover, is sold a year at a time, and has to be bought within 30 days of delivery — buy one year, not four.
You will get an email before the original cover runs out.
Five things riders report, and what they usually are
Sorted by how often we get the message, not by how serious it is. Two of these are not faults at all.
Something else? Our team answers in your language.
Almost always the weather and the tyres, in that order. A cold pack gives less; a tyre 0.8 bar down costs more than any assist setting. Note the temperature, set the pressure to the sidewall range, ride the same route, and compare. If it is still down after that, tell us the two numbers and we can say whether the pack is the problem.
Which bike matters here. The K01 and K02 read a torque sensor at the bottom bracket — they respond to how hard you push. The K03 reads cadence, so it responds to the fact that you are pedalling, and it will always feel less immediate. That is the architecture, not a fault. On a K01 or K02 the sensor is a stocked spare part.
The K01 and K02 run a KT-LCD10H; the K03 runs a KT-INS01. They are different units with different codes. The manual in the box is the generic KT factory version and carries KT defaults, not our values — so read us the code rather than the sheet.
Working as supplied. All three are configured for EU road use: assistance to 25 km/h, 250 W continuous. Nothing to fix.
Stop here. Intermittent power, a burning smell, or a pack that will not seat is not a driveway job, and the controller is not covered by the warranty — opening it ends the conversation about who pays. Photograph it, note the frame number, and write to us.
Cheap to do. Expensive to have done.
IPX5 is a hose at low pressure. A lance drives water past seals that were never asked to hold it — into the motor housing, the bearing races and the battery seat. A bucket and a brush.
Both at once is how a good pack becomes a dead one. Dry it, warm it to room temperature, then charge it — indoors, on a hard surface, not on a carpet.
It is not covered by the warranty on any of the three, and once it has been opened there is nothing left to argue about. Photograph the fault instead.
Configuration, output, wiring. Changing any of them takes the bike outside how it was sold and outside what we can stand behind. If you are thinking about it, ask first — the answer may even be yes, in writing.