Rear tire of motorcycle Enduro 3 Sahara of the company Metzeler. It is suitable for sport driving, meaning it is designed for use over long distances and at high speeds.

Its dimensions are 90/90-21. That is, it has a width of 90mm, a profile of 90, and can be mounted on a 21" rim. The profile in tires, meaning the height of the tire's sidewall, is always referred to as a clean number without a unit of measurement as it is a percentage of the width. For example, a 180/55 tire has a width of 180mm and a profile of 55, meaning it has a profile of 180 x 0.55 = 99mm.

The TT marking comes from the initials of the words Tube Tyres. Tires bearing this marking require an inner tube.