---
title: Two Types of TPMS Systems
description: What is the big difference between Indirect TPMS versus Direct TPMS?
---

[JDI Blog](https://blog.johndow.com/jdi_blog)

# [Two Types of TPMS Systems](https://blog.johndow.com/jdi_blog/two-types-of-tpms-systems)

 Written by [Greg Iorfida](https://blog.johndow.com/jdi_blog/author/greg-iorfida) | Apr 28, 2022 1:04:45 PM

What two types of Tire Pressure Monitoring Systems (TPMS) are there? First, there is *Indirect* TPMS, and then *Direct* TPMS. Let's look at how they differ:

### **Indirect TPMS**

An Indirect TPMS doesn’t measure tire pressure. It doesn't electronically process the same kind of measurement you might see with a tire gauge. Instead, an indirect TPMS relies on wheel speed sensors of anti-lock brake systems. It measures how fast your tires are rotating and sends a signal to your on-board computer, which interprets the relative size of your vehicles' tires and compares to other operational data, like speed. When a wheel spins faster than expected, the computer can interpret this as an underinflated tire and will alert the driver.

**Here are a few disadvantages of Indirect TPMS:**

- May inaccurately measure the wheel revolution rate if you put a bigger or smaller tire on your vehicle
- May be unreliable when tires are unevenly worn
- A reset is necessary after properly inflating every tire
- A reset in necessary after after routine tire rotation
- Cannot measure or display absolute pressure values

### **Direct TPMS**

Direct TPMS uses pressure monitoring sensors within each tire to monitor specific pressure levels – not just wheel revolution data from the anti-lock brake system.

Sensors in a Direct TPMS may even provide tire temperature readings. The Direct TPMS sends this data to a centralized control module where it’s analyzed, interpreted, and, if tire pressure is lower than it should be, alerts the drive on the dashboard. A Direct TPMS usually sends all this data wirelessly. Since each sensor has a unique serial number, your vehicle can distinguish itself from other vehicles and can also provide pressure readings for each individual tire.

Here are a few advantages of Direct TPMS:

- Can deliver actual tire pressure readings from inside the tire
- Not prone to inaccuracies because of tire rotation/tire replacement
- Simple resynchronization after tire rotation/tire replacement
- Batteries inside the sensors usually last around eight years
- A vehicle's spare tire can also use a Direct TPMS

For more information on TPMS systems and parts, visit our [JohnDow.com/TPMS](https://johndow.com/tpms/).

[View full post](https://blog.johndow.com/jdi_blog/two-types-of-tpms-systems)

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