Steer tire question

Wow.
New underwear too?

 

I know the reply is late but that crack or split is usually caused by a rock penetrating the rubber when the rubber is most vulnerable; when its wet. Judging by that style of tire. It's a Michelin xza3 directional steer. Excellent tire both in winter and summer. The best solution to tell if that crack will be a problem is to probe it with a pick... if you feel steel belt plys I'd change it for safety purposes or move it to a trailer tire

 

Another possibility is that you turned your steerwheel while standing still on a stone.
Not saying you personally did that but it is worth menthioning.
The damage would look similiar.

 

I start feeling shaking in my truck... i have michelin tires 22.5 and i have 120k on them. I also run centramatica on them. How long these tires last. I changed my leaf springs and new shocks and alignment and still i have vibration or some shaking in my hood. When i roll down my window and look at the tire i can see like going left-right-left when i’m driving straight. I wanted to take the centramatics out and rotate them and balance them without the centramatics. What do you guys think? And i forgot this will be probably sad part bcs i found lil nail on the side of my driver tire so i guess i will have to buy new pair of steer tires. I will post pic of my tires and i think they have still life in them but shaking and this nail i thinm is from them. Any opinion is wecome and thank you!