What Drives TPMS Cost in an Aftermarket Kit Sensor price is rarely the biggest number in a TPMS kit. Here is where the cost actually sits, and why removing the receiver changes the whole calculation.

The number buyers ask about is the wrong number

Almost every TPMS enquiry opens with the same question: what does the sensor cost. It is a natural question and, for a bill-of-materials decision, an incomplete one. The sensor is usually not the largest item in a kit, and in some configurations it is not even the second largest.

Understanding where the money actually goes is what turns a price into a costed product. It also explains why two kits with similar sensor prices can differ substantially by the time a vehicle is fitted.

Where the cost sits

A complete TPMS installation has five cost centres, and they behave differently.

Item	Behaviour	Notes
Sensors	Scales with wheel count	The visible number, rarely the largest
Receiver or display	Fixed per vehicle	Often the single biggest hardware item
Installation labour	Fixed per vehicle	Frequently exceeds the parts cost
Packaging and literature	Fixed per unit	Retail-grade packaging is not free
Support and spares	Per programme	The cost nobody budgets until year two

The receiver line is the one worth dwelling on, because it is the item a Bluetooth sensor removes entirely.

Removing the receiver changes the arithmetic

On a conventional installation, every vehicle needs a receiver and a display, whether or not the buyer values them. The receiver is a fixed cost that does not scale down: ten vehicles means ten receivers, and ten receivers is a considerable sum compared with the sensors they read.

A BLE sensor in the 2.4 GHz band pairs directly with a phone or tablet, so the receiver is not part of the bill of materials at all. The display already exists, in the customer's pocket, and the app is software.

That has three consequences a buyer should think through.

The fixed cost per vehicle falls sharply. For a kit sold at an accessible price point, removing a hardware item that costs more than several sensors is the difference between a product that fits a retail price and one that does not.

The kit gets simpler to install. No receiver to mount, no power feed to find, no antenna to route. On a motorcycle, where there is nowhere neat to put a display, this is not merely a saving; it is what makes the product installable at all.

The cost moves to the customer's phone. Which is fine, and also a real dependency. A BLE-only product requires the buyer to have a compatible phone and to keep the app. For a customer who will not use an app, the receiver has to come back, and at that point the project is a conventional one.

Where the sensor cost genuinely varies

Sensor unit price is not arbitrary. It moves with several things a buyer can influence.

• Wheel count per set. Two sensors cost less than four; a multi-axle set is a different product.
• Battery choice. A sealed cell is marginally cheaper to build than one with a serviceable compartment.
• Marking complexity. A standard wheel-position marking costs nothing extra; a bespoke scheme adds a setup step.
• Volume. The largest single lever, and the one buyers underestimate. Setup cost per batch is amortised over the order.
• Packaging. Bulk carton versus retail box is a meaningful difference at the unit level.

None of these are secrets, and a supplier who will not break them out is either guessing or marking up an unspecified amount.

Installation is the cost buyers forget

In a kit that a dealer installs, labour can exceed parts. The figure depends entirely on whether the tyre has to come off.

A valve-mount sensor is fitted in minutes with the wheel on the vehicle: unscrew the cap, screw on the sensor, pair it. A strap-mount or internal sensor requires the tyre to be broken down, which is a workshop job, and on a multi-axle vehicle that is multiplied across every position.

This is the single biggest determinant of fitted cost, and it is why the mounting question should be asked before the sensor price. A cheaper sensor that needs tyre removal can be the more expensive choice by a wide margin.

Tooling, if you want your own housing

For a branded programme, a custom housing is a tooling cost rather than a unit cost. It is paid once and then amortised over production, which means it looks expensive at low volume and trivial at high volume. The correct comparison is not the tooling invoice but the tooling cost per unit at the volume you actually expect to sell.

The same logic applies to packaging. A retail box design costs the same whether you print ten thousand or a hundred thousand; what changes is the cost per unit.

What a supplier should be able to itemise

A quotation that a buyer can approve has six lines, not one.

1. Sensor, per unit, at the specified volume.
2. Receiver or display, if any, per vehicle.
3. Marking and branding setup, one-off.
4. Packaging, per unit, by type.
5. Tooling, one-off, if a custom housing is involved.
6. Anything assumed — for example, whether the quoted price includes pairing documentation or training material.

If those six cannot be produced, the single number on offer is not a price, it is an estimate with hidden variables. We do not publish price lists, because a sensor specification without a wheel count, a battery choice, a mounting decision and a volume is not enough information to quote from, and a number produced from it would be misleading. The OEM and ODM page sets out what we need in order to quote properly, and the BPU100 sensor page gives the platform specification that the quotation would be built on.

A note on cheap sensors

There is a persistent assumption that a low sensor price is the way to win a price-sensitive market. It is worth being sceptical, because in a tyre-pressure product the sensor is the part that has to survive the environment. A sensor that fails at the roadside costs a distributor far more than the margin it saved, in returns, in support and in reputation with the dealer who fitted it.

The useful question is not which sensor is cheapest, but what a supplier removed to get there. Pressure calibration on every unit rather than by sampling, sealing that survives a pressure wash, and a radio whose duty cycle was not stretched past the cell's ability to deliver — those are the things that get cut, and they are not visible in a price list. Our own position is that pressure calibration is performed on every unit, not by sampling, and that a specification we cannot hold is one we will not quote. That is a cost decision, and buyers are entitled to know it was made deliberately.