Is 4 32 a good tread depth?
The tire tread depth gauge measures in 32nds of an inch. Good tire tread depth will be 6/32 or deeper. If the depth is 4/32, you should start thinking of replacing your tires and getting new ones. 2/32 or less means that you should change your tires ASAP.
Put George Washington's head into one of the big grooves. If the top of his head is flush with the tread, you have about 4⁄32 inch of tread left, meaning you have some grip remaining for rainy or snowy conditions. That's the time when you should start shopping for new tires.
Normally, used tires last 2-5 years if bought in adequate condition. A 2-year-old tire with no damage, patches, uneven wear, and with about 8/32” tread left, may last for good 5 years. A 4-year-old tire with 5/32” tread left, and without any significant plugs or cuts, may last a further 2 years.
Then usable tread depth is compared to remaining tread depth in order to calculate tread wear percentages. For example, a tire that started with 10/32" of original tread depth and has worn off 4/32" (down to 6/32" of remaining tread depth) is 50% worn.
Check For Tread Depth
To meet legal safety standards in the U.S., a tire's tread needs to be at least 2/32” deep. If the tires do not meet the 2/32” standard or are approaching not meeting it, you should replace your tires.
At the legal minimum tread depth of 1.6mm, the stopping distance is increased by 36.8% on the hot rolled asphalt and 44.6% on the smooth concrete. From the independent research, RoSPA recommends that tyres are changed once the tread reaches 3mm in depth.
The U.S. Department of Transportation recommends replacing tires when they reach 2/32”, and many states legally require tires to be replaced at this depth. The idea of the penny test is to check whether you've hit the 2/32” threshold.
Low tire tread: Many mechanics recommend replacement when your vehicle reaches between 3/32 and 4/32 of an inch. This is especially true if you live in an area with severe climates to prevent hydroplaning and other inclement weather risks. Good tread levels: New tires often have 11/32 of an inch of tread.
A tire with a half-tread depth usually has 5/32 to 6/32 of an inch remaining. Tires are worn-out when they reach 2/32 of an inch, but you don't need to go that low to see a substantial decline in performance on slick (wet, snowy, or icy) surfaces.
6/32” Your tire's tread depth is sufficient for 3-seasons but nearing minimum for a winter tire. 5/32” If wet roads are a concern, consider replacing your tires. 4/32” – 3/32” Seriously consider replacing your tires as soon as possible. If it's a winter tire, 4/32” is the minimum.
Is a 5 32 tire still thick?
5/32” is still sufficient in most cases, but tires may start to lose traction on wet roads. 4-3/32” is the level at which you should think about choosing a new tire/set of tires. 2/32” is the average legal minimum for tread depth; at this level your tires are considered bald and unsafe.
The minimum legal limit is 2/32 of an inch. This doesn't mean that tires are perfectly safe if they have 3/32 left of tread. This is simply the limit at which you won't pass your state safety inspection. Your tires become incrementally less safe as the tread wears down.

A tire with a half-tread depth usually has 5/32 to 6/32 of an inch remaining. Tires are worn-out when they reach 2/32 of an inch, but you don't need to go that low to see a substantial decline in performance on slick (wet, snowy, or icy) surfaces.
The U.S. Department of Transportation recommends replacing tires when they reach 2/32”, and many states legally require tires to be replaced at this depth. The idea of the penny test is to check whether you've hit the 2/32” threshold.
Once your tire tread is below 1/8th of an inch of rubber, most industry experts suggest preparing to replace. If you are down to 1/16th of an inch, your tires are considered worn out, and most states require immediate replacement.
Low tire tread: Many mechanics recommend replacement when your vehicle reaches between 3/32 and 4/32 of an inch. This is especially true if you live in an area with severe climates to prevent hydroplaning and other inclement weather risks. Good tread levels: New tires often have 11/32 of an inch of tread.