If you've just exported your first track day session and you're staring at a wall of squiggly lines, this guide is for you. Telemetry is just a story your bike tells about every metre of every lap — once you know which line is saying what, you can find seconds in places you didn't know you were losing them.
Key takeaways
- Speed trace tells you how fast you're going at every point on the lap.
- Lean angle tells you how committed you are mid-corner.
- Throttle position tells you where you're getting back on the gas — and how aggressively.
- Brake pressure (if your logger has it) shows where and how hard you're braking.
- The fastest riders aren't always doing one thing dramatically better — they're doing five small things slightly better, and telemetry shows you which.
What is motorcycle telemetry?
Motorcycle telemetry is the recording of your bike's behaviour during a lap — typically GPS position, speed, lean angle, throttle, and (with the right logger) brake pressure, suspension travel, and gear position. After your session, the data is plotted as a series of traces against either time or distance around the track.
A telemetry app turns those traces into a picture of your lap so you can compare:
- Lap to lap — what changed between your fast lap and your slow lap?
- Rider to rider — where is your mate finding time on you?
- Session to session — has the new sprocket actually helped, or are you just hoping it has?
You don't need a £2,000 race-team data system to do this. A modern GPS logger with an IMU — like a RaceBox Mini — gives you 95% of what a club racer needs.
The four traces every rider should learn first
1. Speed trace
The most important line on your screen. It plots speed against either time or distance.
A clean speed trace has:
- A sharp peak at the end of each straight (you held the gas to the brake marker).
- A clean dip through each corner (you didn't over-brake or coast).
- A steady climb out of each corner (you got back on the throttle smoothly).
What slow looks like:
- A flat-topped peak — you got off the gas before the brake marker.
- A jagged dip — you were on and off the brakes mid-corner.
- A dragged climb — you waited too long to pick up the throttle.
2. Lean angle
Lean angle, measured in degrees, tells you how committed you are at the apex. Most modern sportsbikes will lean to 50–55° before scraping hard parts. MotoGP riders see 65°+, but you don't need that — and chasing it is how you crash. We've written a deeper dive on lean angle if you want to understand what 50° actually means and how to build to it safely.
What to look for:
- A plateau at the apex of each corner (you held the lean smoothly).
- Symmetry between left and right corners of similar speed (if you're 8° down on left-handers, that's a real thing to work on).
- Smooth ramp-up and ramp-down — sudden steps usually mean you're forcing the bike rather than letting it lean.
A common rookie pattern: max lean angle happens after the apex, not at it. That's a sign you're tipping the bike in late and panicking through the corner.
3. Throttle position
Throttle position runs from 0% (closed) to 100% (pinned). The trace tells you where and how aggressively you're applying power.
The truth most amateurs don't want to hear: slow riders aren't slow on the brakes. They're slow on the throttle. They roll on too gently, too late, and stay closed too long after the apex.
Look at your throttle trace and ask:
- At the apex, am I already at 30–40% throttle, or still at zero?
- After the apex, am I climbing to 100% in a smooth ramp, or in panicked stabs?
- Am I pinning it before the bike is upright, or am I leaving the bike to coast?
4. Brake pressure (or speed delta)
If your logger has a brake sensor, you'll see brake pressure in bar or PSI. If it doesn't, ApexIngest derives a speed delta — the rate at which speed is decreasing — which is a good proxy.
A good braking trace:
- One firm initial squeeze at the brake marker.
- A gradual release as you tip into the corner (trail braking).
- Brake pressure at zero before the apex, not at it.
If you see two peaks of brake pressure in one corner, you braked, panicked, and braked again. Common at corners with blind apexes — you'll find seconds here just by walking the track.
Reading a lap: a worked example
Let's say you've ridden Brands Hatch Indy (we have a corner-by-corner Brands Hatch Indy track guide if you want context) and your fastest lap is 52.4s. Your mate Dan is doing 51.6s on a similar bike. Where is the time?
When you overlay your traces in ApexIngest's lap comparison, you'll typically see something like:
You Dan Delta
Paddock Hill -0.0s -0.0s 0.0s
Druids -0.1s -0.0s +0.1s
Graham Hill -0.2s -0.3s -0.1s
Surtees -0.4s -0.6s -0.2s
Clearways -0.6s -1.1s -0.5s ← here
Pit straight -0.6s -1.0s +0.4s
The whole lap was actually within a tenth of Dan's — except for Clearways. Look at the throttle trace through Clearways and you'll likely see Dan back to 100% half a second before you. He's not braver. He's just trusting the rear tyre earlier, and that earlier throttle pickup translates to higher speed all the way down the pit straight.
That's the entire point of telemetry. Without it, you'd be working on your braking into Druids — which was already fine.
Common rookie mistakes (and what their telemetry looks like)
| Mistake | What you'll see in the data |
|---|---|
| Off-throttle too long | Long flat zone in throttle trace through the apex |
| Tipping in late | Lean angle peak after the apex, not at it |
| Over-braking | Brake pressure trace shows two peaks per corner |
| Coasting onto the brakes | Speed dropping before brake pressure rises |
| Inconsistent | Lap-to-lap traces look different even on similar laps |
How to actually use telemetry to get faster
This is a quick summary — for the full process, see our 5-step method for improving lap times with telemetry.
The order most riders skip is:
- Set a baseline. Your first session of the day, just ride. Don't chase time.
- Find the biggest delta. When you compare your fastest lap to a slower one, where is the largest single chunk of time? That's your target.
- Make one change per session. Two changes and you can't tell which one worked.
- Re-export and compare. Did the change move the trace where you expected? If yes, keep it. If not, drop it.
- Repeat with the next biggest delta.
Riders who try to "get faster everywhere at once" end up faster nowhere. Telemetry forces you to be specific about what you're working on.
FAQ
Do I need a fancy data logger to read telemetry? No. A modern GPS logger with an IMU — like the RaceBox Mini at around £200 — gives you GPS speed, lean angle, and lap timing. That's enough to find the vast majority of time amateur riders are losing. See our compatible devices guide for the full list.
How is GPS-only telemetry different from professional race-team telemetry? Race teams add channels like front and rear suspension travel, individual brake pressure per circuit, throttle butterfly position, and sometimes even tyre temperature. For a club racer, GPS + IMU + a derived throttle channel gets you 90% of the value.
How often should I review my data? After every session. Memory of what happened on track decays in minutes. The data doesn't.
What's the single biggest mistake amateurs make? Being too gentle with the throttle out of corners. Look at your throttle trace through every corner exit — if you're not at 100% by the time the bike is upright, that's where your time is going.
Want to put this into practice? Upload your first session free — works with any GPS logger, formats auto-detected, zero setup.