Preorder open · ships late Q1 / early Q2 2027

Kart telemetry,
live in your pitlane.

A standalone lap timer & telemetry device with 25 Hz GPS and LTE on board. No phone strapped to the wheel, no mounts to buy, no museum-grade software to install. Built by a group of endurance-karting friends who wanted pro-level data without the pro-level price.

Reserve yoursWhy we built it
GPS
25 Hz
Live uplink
LTE
Display
Transflective
Built for
Endurance

Why we built this

We're not pros.
That's the point.

Racingline started in a rental-kart paddock. We're a group of friends — engineers by day, endurance karters on weekends — and during long team races our pit wall was basically guesswork: paper notes, shouted lap counts, and a stopwatch someone forgot to press.

The off-the-shelf options all had the same problem. Phone-based lap timers meant buying a separate mount and strapping an expensive phone to a vibrating kart — then watching the screen wash out in the sun while the battery cooked. Professional data loggers cost more than a season of race entries, and they're built for factory teams with a data engineer on payroll. We're not that. Most karters aren't.

So we built our own. The first version was a tangle of dev boards zip-tied to a kart for our own endurance team. The second survived full race weekends and streamed live laps to our pit crew. The third generation — the one you can preorder — is a proper product: one rugged device, its own LTE connection, and software that feels like it was made this decade.

We built it for people like us: obsessed with racing and the tech behind it, even if we're never getting a factory seat.

  1. MK1Dev boards & zip ties. Built for our own team. It worked. Mostly.
  2. MK2Survived full endurance weekends. Live laps on the pit wall over LTE.
  3. MK3Custom board, real enclosure, 25 Hz GPS. The one you can preorder.

The endurance team

Six drivers, one rented kart, somebody's laptop on the pit wall. Stints, swaps, gaps and per-driver pace — live over LTE, and the cost splits four ways.

The owner-driver

Your chassis, your setup days. 25 Hz traces, sector deltas, and a spec sheet written for someone who'll actually read it.

The track regular

Same outdoor track, every month. Your lap history, your lines, and finally proof you're quicker than last season — data you keep.

Features

What it actually does.

  1. 01

    High-precision GPS, 25 times a second

    Position, speed and racing line with enough resolution to see exactly where a tenth was won or lost.

  2. 02

    Live to the pitlane

    LTE is built in. Laps, gaps and pace stream from the kart to your pit crew in real time — no phone tethering, no hotspot juggling.

  3. 03

    Fits any rental kart

    On in seconds, off at the end of the stint. No tools, no modification, nothing left behind — built for karts you will never see again.

  4. 04

    Transflective screen

    The display gets more readable in direct sun, not less — and it sips power, which is where the long battery life comes from.

  5. 05

    Bluetooth offload

    Track with no LTE coverage? Everything is recorded on the device. Dump the full session over Bluetooth and analyze it afterwards.

  6. 06

    Driver profiles

    Swap drivers mid-race with two taps. Laps are tagged per driver, so everyone gets their own bests, pace and progress.

  7. 07

    Software from this decade

    Your data lives in a modern web app. No drivers, no dongles, no Windows-XP-era installer from a forum attachment.

  8. 08

    Built for the long haul

    Stint timers, pit windows and race-day battery life. Designed around the long team races we actually drive.

The phone problem

A phone on the wheel makes you slower.

Not because it might fall — because some part of your brain is protecting it. With a €200 purpose-built device, you stop being careful. That's the whole argument, and anyone who has raced with their own phone strapped to a kart already knows it.

“Airplane mode plus Guided Access fixes all of that.”

It does — if you rerun the ritual before every single stint. And it does nothing for heat, sunlight or battery, while live data to the pit wall is impossible in airplane mode. The fix for racing with a phone is making it less of a phone.

“But your device gets strapped on too.”

It does. The difference: a quick-mount built for exactly one shape and one job, a fraction of the mass of a phone in a case in a universal clamp — and if it takes a hit, it's a €200 tool designed around karting's abuse, not the object your whole life signs in through.

Session log — phone as lap timer
  • LAP 6Screen locked itself mid-stint. Delta gone.
  • LAP 11Incoming call took over the display.
  • LAP 14Notification banner parked over the delta, right at the braking point.
  • LAP 19Thermal shutdown. July, open sun.
  • LAP 23Battery flat. The race was not.

All lived. None hypothetical.

Live telemetry

Your pit crew sees it the moment it happens.

During an endurance race, the driver is busy driving. The people who actually need the data are standing at the pit wall. With LTE on board, every lap, sector, gap and stint timer streams straight from the kart to a live dashboard in the browser — on any laptop, tablet or phone in the paddock.

  • Live lap times, sector splits and field gaps
  • Stint and pit-window tracking for driver changes
  • “Pit this lap” signalling from the wall to the driver
  • Full session history you can replay lap by lap

ML race coach

A race engineer you don't have to hire.

On supported tracks, the machine-learning coach compares every lap you drive against the fastest lines through each corner. Then it tells you what to actually do about it: brake later here, take an earlier apex there, stop throwing away three tenths at the hairpin.

  • 01 Braking points, corner by corner
  • 02 Racing-line deltas against the fastest laps
  • 03 Per-driver feedback — it coaches you, not your teammate
  • 04 Track list keeps growing — request yours at launch

Coaching launches on supported tracks first. Lap timing & telemetry work at any outdoor track — GPS needs sky, so no indoor circuits.

The hardware

Moves between karts in seconds.

Custom board, sunlight-first display, LTE and GPS antennas inside one rugged box. It goes onto an unmodified rental kart in seconds and comes off at the end of the stint — no tools, nothing left behind. Works on a kart you will never see again.

ONE TAKE — ONTO A RENTAL KART, TIMER RUNNING
FRONT — 5.0" TRANSFLECTIVE DISPLAY
CRASH UNIT — STILL LOGGING

RENDERS & RACE FOOTAGE COMING TO THIS SPOT SHORTLY

Fleet compatibility

We name chassis here as we test them — no vague “fits most karts”. Racing a fleet we haven't listed yet? Tell us at hello@racingline.techand we'll confirm the mount or build one before you pay anything.

For the track regulars

The venue says 52.4.
Not why.

The transponder loop at your local track is genuinely accurate — a fixed point, measured to hundredths, every lap. It's also the end of what it tells you. No sectors. No speed trace. No line. No braking points. Nothing to compare with last month except one number.

And the number isn't yours. It lives on a printout, a lobby screen, or an app that forgets you — a different system at every venue, gone when they switch providers. Nobody who has karted for two years can say whether they're actually faster than last season.

What we're really selling:

Your lap history, across every track you visit, that you keep.

How it stacks up

Made for karters, not factory teams.

Phone timers assume you'll risk your phone. Pro loggers assume you own the kart. Venue timing assumes the lap time is all you wanted to know. We sit in the middle of all three.

RACINGLINE MK3PHONE-BASED GPS TIMERSPRO DATA LOGGERSYOUR VENUE'S TIMING
Kart you don't ownOn and off in seconds — no tools, nothing left behindClamps on, but it's your phone taking the riskCustom install & wiring — a non-starter on a rentalBuilt into their karts — but it's their system
What a lap tells youSectors, speed trace, line, braking pointsLap and sectors, if the app is goodEverything, if someone reads itOne number — and nothing about why
Live data to the pit crewLTE built in — streams automaticallyDepends on your phone and its data planTelemetry add-on, priced accordinglyLap times on a lobby monitor, if that
Sunlight readabilityTransflective — sharper in direct sunWashes out, then overheatsVaries by unitNo display on the kart at all
Race-day batteryLow-power screen, endurance-length lifeGPS + screen drain it in hoursUsually wired to the kartTheir hardware, their problem
Your data afterwardsFull history, every track, yours to keepYours for as long as the app lastsCSV exports on the team laptopA printout, gone next month
Crash & vibrationPurpose-built mount, a €200 tool built for thisAn expensive phone on a vibrating kartRobust — so is the invoiceNothing on the kart to break
SoftwareModern web app, zero installsDecent apps, tied to the phoneDesktop suite from another eraThe lobby screen

Road to your grid slot

Where we are, and where this is going.

  1. NOW — 2026

    Preorders open

    MK3 prototypes are on track with our own endurance team every month. Reserving a slot costs nothing and holds your place in the first production run.

  2. END Q1 — EARLY Q2 2027

    First shipments

    Early preorders ship first, in reservation order. We would rather tell you an honest date now than a fantasy date twice.

  3. BEYOND

    Coach expansion & OTA updates

    More supported tracks for the ML coach, new features over the air. The device you get keeps getting better.

Preliminary specs — MK3

The numbers, for the spec-sheet people.

We are those people too. These are the numbers we're building and testing to — final specs are locked at certification, and preorder holders hear about any change first, with the reason.

GPS
25 Hz high-precision, multi-constellation — needs open sky, so outdoor tracks only
Connectivity
LTE Cat 1 + Bluetooth
Display
5.0" 800×480 transflective IPS, capacitive touch
Sensors
6-axis IMU — g-force & rotation
Logging
Onboard microSD — every session recorded, always
Battery
Rechargeable Li-Po, endurance-race runtime
Live uplink
Real-time telemetry to the web dashboard over LTE
Offload
Bluetooth session dump when there is no coverage
Software
Browser-based — nothing to install, OTA firmware updates
Mounting
Quick-mount included — onto a rental kart in seconds, no tools

Preorder — first production run

Reserve your grid slot.

No payment today. A reservation holds your place in the first production run — shipping late Q1 / early Q2 2027, in reservation order. Cancel any time with one email; we're karters, not a subscription trap.

TARGET PRICE €199EARLY-BIRD LOCKED AT RESERVATION · PAY ONLY WHEN YOURS SHIPS

  • Early-bird price locked when you reserve
  • Free upgrade to the next hardware revision — terms below
  • Build-progress updates from the paddock
  • A say in what we build next

No spam. Race-pace updates only.

THE EARLY-BACKER UPGRADE — ACTUAL TERMS, ON THE PAGE

  1. If we release the next major hardware revision within 12 months of your order date, you get it free.
  2. If 12 months pass with no new revision, the promise lapses — you keep your current unit and lose nothing.
  3. On upgrade, we ship the new device and the old one comes back to us — board and enclosure only. The battery pack stays with you: keep it or dispose of it locally, because lithium doesn't travel well.
  4. Send it back dirty and beaten up. The worn units teach us the most — the next revision is built from real failure data, not a re-skin.

FAQ

Fair questions.
Straight answers.

Can I use this on a rental kart I don't own?

That's the design brief. The quick-mount goes onto an unmodified kart in seconds and comes off at the end of the stint — no tools, no modification, nothing left behind. Most of us race rentals; the device assumes the kart is borrowed and the data is yours.

Will the track let me?

Here's the argument to hand the track manager: nothing permanent, no tools, no modification to their kart, and it leaves with you when the stint ends — closer to bringing your own helmet than to touching their equipment. If your venue wants specifics, show them this page or put them in touch with us and we'll answer directly.

Does it work indoors?

No. GPS needs sky, so indoor circuits are out — this is a device for outdoor karting, full stop. If your racing is indoor-only, we'd rather tell you now than after you've paid.

When will devices actually ship?

We are targeting the end of Q1 or the beginning of Q2 2027 for the first shipments, in reservation order. Hardware timelines are hard and we would rather under-promise: if anything slips, preorder holders hear it from us first, with the reason.

Do I need a SIM card or a subscription?

No SIM to source yourself — LTE is built in, and we are finalizing how connectivity is bundled before launch. Two things are already certain: lap timing and on-device telemetry work fully standalone with no connectivity at all, and Bluetooth offload will never require a subscription.

What if my track has bad LTE coverage?

Nothing is lost. Every session is recorded on the device itself, always. If there is no coverage, your pit crew misses the live feed, but you dump the complete telemetry over Bluetooth afterwards and analyze everything in the same web app.

Does it work at any outdoor track?

Yes: the device recognizes nearby tracks and their layout variants, and on unknown circuits it can learn the start/finish line from your driving or let you set it manually. The ML race coach is the one feature that needs a supported track — that list grows continuously, and preorder holders choose which tracks we add first.

Is my money at risk if I preorder?

You pay nothing today. A preorder is a reservation: it locks the early-bird price and your place in the first production run. When your build slot is ready we ask for payment — and until then you can cancel with a single email.

Why not just use a phone with a GPS lap-timer app?

We did, for years, and the phone cost us more laps than the drivers did: screens locking mid-stint, a call taking over the display, a notification banner parked over the delta at the braking point, thermal shutdown in July, battery flat before the flag. Airplane mode and kiosk tricks fix some of that — at the cost of a ritual before every stint — and they do nothing for heat, sun or battery, while live pit-wall data is impossible in airplane mode. Mostly, though: when the thing on the wheel is a €200 tool built for this, you stop protecting it and just drive.

Who is behind this?

A small group of friends who race rental and endurance karts together and build software and hardware for a living. We have been racing home-built versions of this device with our own team for two seasons. This is the version we finally trust enough to put in your hands.