
“Nitrogen in tires?” says one anonymous automotive instructor incredulously. The air already is 78 percent nitrogen. Shop air is just as good.

“Nitrogen in tires?” says one anonymous automotive instructor incredulously. The air already is 78 percent nitrogen. Shop air is just as good.

Direct TPMS, such as the Doran 360 series, uses pressure sensors located on each wheel’s valve stems to directly measure the pressure in each tyre. These sensors broadcast pressure data via a wireless network.