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.
Checking Tread Depth. Most tires in production today have little raised rubber bars built into their design, called tread wear indicators (TWI), that show you when your tread depth reaches the recommended replacement threshold (usually around 1.6mm [1/16th inch] for street tires, off-road tires are more subjective).