Serviceautosrepair.com - There are several popular ways to check your tire tread depth. One easy way is the penny test, quarter test, treadwear. One easy way is the penny test. Simply insert a penny into your tire's tread groove with Lincoln's head upside down and facing you. If you can see all of Lincoln's head, your tread depth is less than 2/32 inch and it's time to replace your tires. Another easy coin test is the quarter test. Insert a quarter into your tread groove. If the tread touches Washington's head, you have at least 4/32 inch of tread remaining.
Don't have any change on you? No problem. Another way to check tread depth is to look at the treadwear indicator bar that's molded into your tires. The bars are located at the bottom of the tread grooves in several locations around the tire. When these bars become visibly flush with the adjacent ribs the tire has no more than 2/32" of tread remaining. This is a visible indication that the tire should be replaced.
Penny Test, Quarter Test And The Treadwear Indicator
You should monitor your tread depth closely once it reaches 4/32 inch deep. Here's how to assess your tread depth:
4/32" or deeper Good
3/32" Replace Tires Soon
2/32" or less Replace Tires Now
Checking Your Tires for Wear
You should check your tires for wear at least once a month and before and after long trips. To determine whether you need to :(a) buy new tires
(b) have your wheels balanced
(c) have your wheels aligned
(d) change your driving habits, simply read your tire treads for clues.
What the signs of poor tread wear mean.
| Clue | Culprit | Remedy |
|---|---|---|
| Treads worn unevenly, with bald spots, cups, or scallops | Wheel imbalance and/or poor alignment | Have wheels balanced and aligned |
| Erratically spaced bald spots | Wheel imbalance or worn shocks | Have wheels balanced or replace shocks |
| Both edges worn | Underinflation | Add more air; check for leaks |
| Center treads worn | Overinflation | Let air out to manufacturer's specifications |
| Edges of front tires only worn | Taking curves too fast | Slow down! |
| One-sided wear | Poor alignment | Have wheels aligned |
| Saw-toothed wearpattern | Poor alignment | Have wheels aligned |
| Whining, thumping, and other weird noises | Poor alignment, worn tires or shocks | Have wheels aligned or buy new tires or shocks |
| Squealing on curves | Poor alignment or underinflation | Check wear on treads and act accordingly |
Source :
-http://www.goodyearautoservice.com
-http://www.dummies.com
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