Tyre Pressure Monitoring Systems (TPMS)

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Tyre Pressure Monitoring Systems (TPMS) 2018-01-04T00:01:39+00:00
Tyre Pressure Monitoring TPMS

A frequent comment to Bike-Seal/Auto-Seal is “Ah, but I have a Tyre Pressure System that checks the pressures, so your product will block this up……”  WRONG!!

Most OE TPMS’s work on a ‘frequency of rotation’ system. Generally there are two types. One that works directly from the hub and linked with the ABS system, if present.

The second, is a plastic housing located on the inside of each rim. They are attached to the inside of the tyre valve, via a collar or directly screwed into an extended Schrader valve. The housing contains a battery and circuit board, and is filled with a hardened compound to seal against the elements and corrosion. The collar system is widely regarded as superior, as it allows for movement, enabling the housing to be drawn up against the inside of the rim, following its contours for greater protection and security of the unit.

As said, most OE systems work on ‘frequency of rotation’ of the wheel. They ‘talk’ via radio frequency to a vehicle ECU.

It is the ECU that enables a numeric value, based on its programming, which is no more than a distance/circumference calculation.


In layman’s terms, the electronic monitor will monitor the frequency of each complete rotation of the wheel. The ECU is programmed with circumference at a given tyre pressure. In this way xx distance is equivalent to one rotation.

When gas loss occurs the circumference of the wheel is reduced. This in turn increases the ‘frequency of rotation’, which therefore will initiate a warning on your interface, and a value is given due to the ECU programming.

Tyre Pressure Safety

Now we know in basic terms how these OE systems work – we can see that Bike-Seal/Auto-Seal being non corrosive, should not interfere with the radio frequency sent from the electronic monitoring system; especially as the units are themselves protected with a solidified liquid compound.

CARS/VANS – Valve access for product insertion

What is important, is the way in which these TPM units, within the wheel are mounted. Our extensive research has found hub and most collar mounted systems are suitable for product insertion. A very small number of manufacturers using the internally mounted ‘fixed’ units have restricted valve access, making product insertion problematic. Please contact us direct for confirmation of your vehicle specifics if unsure.


A TPM system, whilst having Safety benefits is a PASSIVE system. They were introduced primarily due to environmental pressures,in an attempt to maximise fuel consumption etc, not as a safety device.It should give a warning of a lowered pressure shortly after starting your journey, or a slow gas loss due to damage incurred, if working correctly. They frequently do not operate at low temperatures, and are susceptible to reliability and interference issues, through radio frequency.

BIKE-SEAL/AUTO-SEAL is an ACTIVE system, designed for SAFETY. It should stop slow gas loss, or indeed stop or give a controlled release of gas with a potential catastrophic tyre failure. This in turn, significantly increases the user’s ability to maintain control.

Bike-Seal/Auto-Seal is the only product to be able to offer TRUE SAFETY, whilst being eco-friendly.

Tyre Pressure Monitoring Unit