I believe michelins are directional. I had an S12 awhile back, and it was directional.
It certainly acted directional! Forward traction was great. Braking traction was nada-zip-diddle. The reason I didn't get another one.
In the forward direction the S12 was a rock-throwing, ground-thrumming wonder. It made a moaning sound tearing thru the air like a ripper chain on a chain saw!
You just couldn't slow down!!
But, yeah...that's what the arrow is for. Wasn't that in the 'tutorial' from jag??
heh heh... I've done the same thing. Flipping the wheel back and forth during the process, I failed to pay attention when it came to putting the new tire on. I think that was my sand paddle one of the times I changed for the sand.
If you think dirt tires are fun to change...wait 'til you put a paddle on. A much shorter/stiffer sidewall. You really get to cussin' one'a those!
Enjoy that new tire. New tread is a delight!