> For the complete documentation index, see [llms.txt](https://help.pd1.sg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.pd1.sg/pd-tyre/understanding-tyre-data.md).

# Understanding Tyre Data

Understand your PD-Tyre data.

Understand the tyre data reported by PD-Tyre.

## Where to view tyre data

| Place                                                     | What you see                                                        |
| --------------------------------------------------------- | ------------------------------------------------------------------- |
| **Tire Pressure Health** (Diagnostics → Vehicle Insights) | Overall status, live FL–RR cards, Tire Profile, Submit for a report |
| **Profile** → **PD-Tyre** → device                        | Live preview, Sensor IDs, Alert Threshold                           |
| Device Hub → **TPMS**                                     | Live pressure, temperature, battery, and leak flags per wheel       |
| Home banner                                               | **Tire pressure alert** when something is abnormal                  |
| **PD-Display** dashboard (optional)                       | Floating TPMS widget with pressure or temperature                   |

{% hint style="info" %}
If you see **No live tire pressure data yet**, connect PD-Tyre (or PD-Display on the same vehicle) first.
{% endhint %}

## Live readings

Data is shown for each wheel: **FL / FR / RL / RR** (Front Left, Front Right, Rear Left, Rear Right).

### Pressure

Current tyre pressure for that wheel.

* Display units: **kPa**, **bar**, or **psi**
* Empty / no data shows as `-` or `--`

Compare live pressure with your vehicle’s recommended cold pressure (door sticker) and with the cold pressure you saved in Tire Profile.

### Temperature

Current tyre temperature for that wheel.

* Display units: **°C** or **°F**
* On some TPMS views the row is labelled **TEMP**

Temperature rises with driving. Use it together with pressure — a hot tyre often reads higher than a cold one.

### Battery

Sensor battery level (not a voltage number on the main cards):

* **BATTERY HIGH**
* **BATTERY MEDIUM**
* **BATTERY LOW** (also shown as **LOW** on health cards)

{% hint style="warning" %}
**LOW** means the wheel sensor battery is weak. Plan a sensor replacement before the signal becomes unreliable.
{% endhint %}

### Leak

If the system detects a leak condition, **LEAK** appears on that wheel.

Treat **LEAK** as urgent: check the tyre and valve for damage or slow loss of pressure.

## Status colours and health summary

Tire Pressure Health summarises all wheels as:

| Status                            | Meaning                                                      |
| --------------------------------- | ------------------------------------------------------------ |
| **No TPMS data**                  | No live readings yet                                         |
| **Tire pressure normal**          | Values are within your alert thresholds                      |
| **Tire pressure needs attention** | At least one value is outside the normal band (caution)      |
| **Tire pressure abnormal**        | High pressure/temperature, leak, or other abnormal condition |

On live panels:

* **Green** — in the normal range
* **Orange** — below the low threshold (needs attention)
* **Red** — above the high threshold, or leak

Battery colours follow the same idea: high = green, medium = orange, low = red.

## Alert Threshold

On **Profile** → **PD-Tyre** → device → **Alert Threshold**, you set when the app treats a reading as out of range:

| Setting              | What it controls                  |
| -------------------- | --------------------------------- |
| **Low Pressure**     | Pressure below this → caution     |
| **High Pressure**    | Pressure above this → abnormal    |
| **Low Temperature**  | Temperature below this → caution  |
| **High Temperature** | Temperature above this → abnormal |

{% hint style="info" %}
Editing thresholds needs a live PD-Tyre connection. If prompted, tap **Connect TPMS** first.
{% endhint %}

Set thresholds to match your vehicle’s recommended cold pressure and safe operating range. Defaults in the app are a starting point — adjust them for your tyres.

## Home Tire pressure alert

When any connected wheel shows abnormal pressure, temperature, leak, or low battery, Home may show:

* Title: **Tire pressure alert**
* Message: **Abnormal tire pressure or temperature detected**

Tap the banner to open **Tire Pressure Health**. The alert can reappear if the condition changes or returns.

## Tire Profile

On Tire Pressure Health, **Tire Profile** stores reference data per wheel (useful for staggered fitment or partial tyre changes):

* **Recommended cold pressure (kPa)**
* Tire size (for example `225/45R17`)
* **Tire install date**
* **Odometer at install (km)**

You can **Apply to all wheels** when every corner shares the same setup.

{% hint style="info" %}
Tire Profile is saved against the PD-Tyre bound to the current vehicle. If profiles cannot be saved, connect or reassign PD-Tyre to this vehicle.
{% endhint %}

Profiles do not replace live sensor data. They help you interpret readings and keep a record of cold pressure and install history.

## Tire Pressure Health Report

When live data is available:

1. Open **Tire Pressure Health**.
2. Review the live FL–RR cards and profiles.
3. Tap **Submit**.

The app opens a **Tire Pressure Health Report** with:

* Current alert thresholds
* Per-wheel pressure and temperature
* **LEAK** / **LOW** flags when present
* Profile details under **More Details** where available

Use the report to review tyre condition after pairing, after a tyre service, or when an alert appears.

## Tips for reading the numbers

1. Check pressure when tyres are cold for the fairest comparison to the door-sticker / profile cold pressure.
2. After a long drive, expect higher pressure and temperature — wait for cool-down before deciding to add or release air.
3. A single wheel that differs from the other three often points to a slow leak, recent repair, or mismatched tyre.
4. Keep Sensor IDs matched to the correct FL / FR / RL / RR positions after tyre rotation.

## Next

If readings are missing or alerts keep appearing, see [PD-Tyre Troubleshooting](/pd-tyre/pd-tyre-troubleshooting.md).


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