A motorcycle racing line is the path you take through a corner: where you turn in, where the bike gets closest to the inside of the track (the apex) and where it finishes on the exit. On a track day there is rarely one painted "correct" line. The useful line depends on the corner, what comes after it, your bike and how confidently you can use the width of the track.
This guide explains the vocabulary, why riders are so often told to look for a later apex and how to review your line afterwards without reading too much into a GPS trace. Use it as background for working with an instructor, not as a substitute for one.
The three parts of a line: entry, apex and exit
Cycle World's line-choice tip, taken from The Total Motorcycling Manual, splits a line into three parts:
- Entry and turn-in point. Where you start turning the bike, usually from the outside of the track.
- Apex. The point where the bike is closest to the inside of the corner. CanyonChasers' delayed-apex article puts the apex roughly two-thirds to three-quarters of the way through a corner.
- Exit. Where the bike finishes, normally drifting back towards the outside as you lift it up and accelerate.
These three points are connected. BikeSocial's California Superbike School Level 2 review puts it this way: "A new turn-in point affects your apex and exit speed among other variables." Move one and you have moved the others too.
Early apex vs late apex
Most line discussions come down to when you turn in, which decides where the apex falls.
| Aspect | Early apex | Late apex |
|---|---|---|
| Turn-in | Sooner, nearer the start of the corner | Later and deeper into the corner |
| Entry | Feels faster on the way in | Gives up some entry speed |
| Exit | Bike still leaned, pointing towards the outside edge | Bike more upright and pointing up the track sooner |
| Typical problem | Running wide, or rolling off the throttle to stay on track | Overdoing it and losing more on entry than you gain |
The early apex is the classic beginner habit. Cycle World notes that new riders tend to turn in too soon, producing an early apex that forces them wide on the exit. Entering wider and apexing later "may seem counterintuitive, but it's usually both safer and faster." Visordown's guide to learning your lines makes the same point: turn in too early and "you'll apex too soon, running wide on the exit."
Why does a later apex tend to work? Dan Netting's Life at Lean article on squaring off and late apexes argues that the entry speed you give up is regained on the exit. Because the bike points further up the track, you can open the throttle earlier with "less fear of running wide on the exit."
Why the late apex is a habit, not a law
A later apex is a sensible default for a track-day rider, but it isn't a rule for every corner.
- Corners come in sequences. Life at Lean notes that when another corner follows closely, squaring off the first one may not suit the second, so you compromise. The line that sets up the following straight or bend can matter more than the corner you are in.
- Bikes differ. Visordown suggests that powerful bikes often benefit from squaring a corner off and driving out early, while light, lower-powered bikes rely on keeping their corner speed with smoother, more flowing lines.
- Racing is a different problem. Life at Lean notes that racers rarely take this squared-off line, because it can leave the door open to being passed on the brakes. That rarely matters in a track-day group with passing rules, but it explains why race footage doesn't always show a textbook line.
The takeaway is to ask "what does this corner lead to?" before asking "where is the apex?"
Squaring off a corner
Squaring off a corner means doing more of your slowing in a straighter line, turning more decisively in a shorter space and then lifting the bike up sooner for the exit. Life at Lean describes it as using less lean angle for less time.
It isn't just a later turn-in point. The transition from braking to turning becomes more concentrated, so it needs to be learned in steps. Our guide to motorcycle trail braking explains that corner-entry transition and why "brake later" alone is an incomplete goal. How you position yourself on the bike also affects how easily it turns; see our body position guide.
Reference points: how to find the same line lap after lap
A line you cannot repeat is difficult to improve. Reference points turn it into something you can practise.
Visordown recommends markers for braking, turn-in, apex and exit. Treat them as references you can adjust as your speed rises, rather than fixed instructions. It also warns against using shadows, because they move during the day. A useful set of references might be:
- Turn-in: the start of a kerb, a marker board or a change in the tarmac.
- Apex: a section of the inside kerb you want the bike to pass closest to.
- Exit: where you want to finish at the outside edge, and something further up the track to look towards.
Where you look matters as much as what you choose. The California Superbike School review describes spotting the next reference point early enough to amend your line, and looking as far ahead as you can. It also warns about target fixation: staring at a hazard tends to take you towards it.
Cycle World suggests the darker rubber laid down on the circuit can show where other riders have been. Treat that as a hint, not an instruction. On circuits shared with car days, the rubbered line may reflect four-wheeled vehicles rather than bikes.
Common racing-line mistakes on track days
Turning in too early
This is the mistake every source above mentions. The bike reaches the inside too soon, then runs out of track on the exit. The fix is usually patience: wait longer at the outside before turning in, as agreed with your instructor.
Leaving a comfort margin on entry
Staying a metre or two inside the edge on entry feels safer, but Visordown notes that space you leave on the way in is track width you no longer have on the way out. That is where you want room to accelerate.
Copying someone else's line
A faster friend's line or an onboard video was ridden on a different bike, at different speeds and possibly a different layout. Use it to start a conversation with an instructor, not as a template.
Taking track lines onto the road
Visordown explicitly warns against using race lines on public roads. Oncoming traffic, hidden junctions and road surfaces change the decision completely. A circuit line belongs on the circuit.
What GPS telemetry can show about your line
A lap comparison plots two laps' speed traces together, ideally aligned by distance around the lap. That makes it easy to see where the bike gained or lost speed around a corner. Where laps are also drawn on a map, plotted position needs more care.
Consumer GPS position is an estimate. Its accuracy depends on the receiver, where it's mounted and how clear its view of the sky is. Two laps can look a metre apart on the map when the bike barely changed position, or the other way round. Before trusting a line difference, check that it repeats across several laps and agrees with your video.
| Observation in the data | Question to investigate |
|---|---|
| Minimum speed occurs later in the corner on one lap | Did the apex move later, or did something else delay the turn? |
| Speed builds sooner after the corner | Was the bike lifted up earlier, or was the exit just clear of traffic? |
| The plotted line runs wider on the exit | Did you run wide, or is it within GPS error? Compare more laps. |
| Lap time is similar but the split changes | Was a gain on the exit spent on a slower entry? |
The point of minimum speed is a useful clue, but it isn't the same thing as the geometric apex. Our beginner's guide to reading telemetry explains speed traces if they are new to you.
A simple line exercise for your next track day
Keep it to one corner and one change per session:
- Choose one corner, ideally one that leads onto a straight, where exit speed has the longest time to matter.
- Ask an instructor to watch where you turn in and where the bike reaches the inside.
- Agree one change, such as a slightly later turn-in reference, and ride well within your limits while you learn it. The California Superbike School review describes riding at around 80% while building skills.
- Record the sessions before and after the change, and pick your best clear lap from each.
- Compare them at that corner, then write one sentence on what changed and what you want to check next time.
For an example of corner-by-corner line notes, see our Brands Hatch Indy track guide. To look at your own recording, try a supported file in the import demo. Comparing laps from different sessions comes with ApexIngest's paid plans. Whichever tool you use, review it alongside your instructor's feedback, not instead of it.
A good line is one you can repeat and explain. Lap time improvements are most useful when you know which part of the corner produced them.