Tire questions

[mrlmd1]

Well I got my bike back 2 weeks ago and the Cheng Shins came from California here to the local dealer. They put the 906 and 907 numbers on the invoice, but the front tire is now a 120/80-16 as discussed and not a 110/90-16. Apparently that is not available anymore anyplace. In my limited riding so far I can't tell any difference in the bike's ride or handling, except they look a whole lot better, and I feel a whole lot better having new tires instead of 9 year old ones. The 120/80 is a little less than 0.4" wider (that's less than 1/4" on each side for the total width of the tire), so it can't make any significant difference other than having very slightly more contact area, maybe a millimeter or two. The contact pattern or dirty area on the tire seems the same as before. What is interesting is that the tires are mounted correctly with the rotation arrows embossed on the sides in the right direction, but the tread pattern front and rear is reversed, with the rain grooves pointing in opposite directions front and rear. I can post pictures if anyone's interested in seeing this. It must be different front and rear for shedding water or traction, but I thought it strange looking at it. Any thoughts on this?