Originally Posted by
Walsted
I've got the 912s on now. (205/50 15s on the stock 15x6 rim) They have a lot of tread left after about 10k worth of commuting miles. It could be the narrow rims, but they seemed to be on the edge of letting go when going around curves during hot days this summer, and that was when they were new. During the snow and ice day, they weren't terribly awful or real impressive. They held where it was dry and didn't do too bad on the sanded bridges. Going over unsanded overpasses was interesting - I held speed and a straight line, and the rear seemed to wag when I transitioned from the highway to the overpass and then again when I transitioned from the overpass to the highway.
I drove a friends NA with the 512s (215/50 15s on 15x7) and the warm weather traction was much better. I didn't have an opportunity to drive those in the rain or ice, though, since this was in the Mojave desert, and it didn't rain or snow much. I know others prefer the 912 over the 512, but I think I would prefer the 512.
Hope this helps.