Internal vs. External tire/tyre pressure monitoring systems


There are two types of Direct Tire Pressure Monitoring Systems

internal sensor systems where the sensor is inside the tire or external systems which use external sensors.  Internal systems use sensors that are strapped around the wheel or replace the valve stem and are inside the tire.  Internal sensor systems require additional antennas in the wheel wells for reliable reception of sensor signals, are expensive to install and maintain and are challenged with getting a reliable signal through the metal and materials of a tire.  External systems are those which have sensors which read from outside of the tire.



Sensor installed inside the tire where the air pressure and temperature are intended to be checked. This is the only way to guarantee the accuracy of the data.

Less expensive, quick and easy to install.

Internal Sensors are installed inside wheel assembly. Good for all wheels;

The Function of External Sensor are the same as the internal.

It will not be stolen, will not be knocked off, will last for the whole product life (5-7 years); 

Installation is quicker than internal Sensors

Does not affect tire valve stems.


Easy to inflate the tire.



ROI - Savings Calculated On Information From Tire Industry & Government Statistics:


  • Trucks driving an average of 150,000 miles per year, averaging 7.5mpg, fuel costs averaging 3.75/gallon – a savings of just ½% amounts to over $375 per year in fuel usage. 
  • Tires low on pressure break down the casing which can’t be retreaded.  New tire costs range between $250 to $650 per tire for a new tire (vs) retreads at $100. 
  • Road call costs are averaging $300 to $900 per call.  (This does not include cost of downtime, tire repair or driver time.)
  • Cost of manually checking tire pressures on one (1) truck with 10 wheels, average of 15 min (DOT) twice per month for 1 year will average about $75 to $100 in labor cost.
  • Tires running just 10% low on pressure prematurely wear tire tread 10% to 13% faster than tires properly inflated.  
  • Safety “costs”; injury claims, insurance premiums, workers' compensation claims, as well as "goodwill" with customers and suppliers are difficult to estimate but are a very real cost affecting profits.