Pre-Maintenance Checks 1. Tire Pressure: Check tire pressure at least once a month, and before long trips. Use a tire pressure gauge to ensure the pressure matches the recommended level, which can be found in the owner's manual or on the tire's sidewall. 2. Tread Depth: Check tread depth by inserting a penny into the tire groove with Lincoln's head facing down. If you can see the top of Lincoln's head, the tread is worn down to 2.32 or less. SS TYRES WARJE