The Toyo Observe GSi-6 HP has a number of features to help wick water and slush, to preserve traction and maintain grip when cornering and braking. From the first glance at its tread, you will notice that it is an aggressive and sporty design. A unique feature of this tire is the presence of small stars on the blocks. These stars are actually helical-edged sipes, and their primary purpose is to improve traction when cornering. These star sipes give you a little more bite, even when the tire is not parallel to the road.
If you're wondering what sipes are, they are grooves of varying depths on the blocks and tread of a tire. On these Toyos GSI-6 HP winter tires, the sipes are deep and wavy, they contribute to the flexibility, while ensuring that the blocks are quite firm when braking, accelerating, or turning. Sipes reduce irregular wear and are essential in a performance winter tire. The other essential characteristic on a winter tire is to have good evacuation. To do this, on this Observe GSi-6 HP, there are four large grooves that go around the entire circumference of the tire.
By design and configuration, the blocks and sipes channel water either to the outside of the tire or to these large grooves formed by serrated ribs. These teeth will give you traction in heavy snow and slush. Surprisingly for a tire in this category is that there are no depth indicators. Usually in high end or performance tires, they can be found molded into the tread and they let you know when the time comes to think about replacing them.