It is a tractor tire.
If you are browsing the forum via a computer laptop or desktop and you have tabbed browsing, the tab that NTT is on should show a little image that is near impossible to recognize. So, I'll let you know it is a tractor tire. It is called a 'favicon'. It only shows up when you are viewing a web page in a different tab. It makes it easier to find the tab you are hunting for. Hope it helps.
Here is a slightly larger image of it.
If you are browsing the forum via a computer laptop or desktop and you have tabbed browsing, the tab that NTT is on should show a little image that is near impossible to recognize. So, I'll let you know it is a tractor tire. It is called a 'favicon'. It only shows up when you are viewing a web page in a different tab. It makes it easier to find the tab you are hunting for. Hope it helps.
Here is a slightly larger image of it.
