ok, now im having another issue: i went to skid stop tonight and my cranks rotated about 1/8th revolution backwards while my tire didnt skid at all. at that point i just hit the brake and stopped as normal, went to the sidewalk and tried to get it to do it again to no avail. then, about 3 blocks later, i was pulling out from a stoplight, mashing hard to get some speed up, and it slipped forward. lockring slipping? im taking it to a shop in the morning, but id like to have an idea of whats wrong before i go.