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.
Tyre Tread Depth Explained. The legal limit for car tyre tread depth is 1.6mm (across 75% of the tyre). However, the deeper the tread the more grip you have.At Blackcircles.com we recommend that you replace your tyres when the tread is less than 3mm as the performance of the tyre will begin to reduce significantly.f the tread depth on your tyres is between 1.6-3mm then it is time to start thinking about ordering a new set. Thanks to our tyre size search tool, it couldn't be easier to pick your new tyres.