Freebase (0.00 / 0 votes) Rate this definition: Tachypnea. Tachypnea is the condition of rapid breathing. In adult humans at rest, any rate between 12-20 breaths per minute is normal and tachypnea is indicated by a ventilatory rate greater than 20 breaths per minute.
A new tire retains a tread depth from 10/32 to 11/32. This tread depth is usually made to last anywhere from 3 to 5 years, depending on how well it is maintained. To measure the tread of a tire using an available chart, follow these steps: Insert a penny into the tire.
Varying standards for minimum tread depth is something that continues to be confusing for those new to the industry. According to the Federal Motor Carrier Safety Administration (FMCSA), the minimum tread depth for truck tires is 4/32nds of an inch on the front axle and 2/32nds of an inch for all other wheel positions. Law enforcement officials often ticket drivers when the tread depths on their vehicles.