I'm interested in the 335 R888's, but I have no clue what shaving does or why?? But my reasoning skills can figure out that the tread is farther down lol. So how much tire life is left? I probably drive 2500 miles a year, how long should they last? I have a mach and 18x11 with 7" backspacing do you think that they would fit in my car? thanks!