Quote:
Originally Posted by Fred68
Drilled discs are more likely to crack due the uneven heat stressing  but they do work better!! |
I'd favour the dimpled discs over the drilled as the dimples still help to vent the brake gasses, but disperse the stress and heat concentration better than the drilled holes.
Although on a road car think the grooves and holes are more for looks rather than performance. Would have to really be hammering the brakes on the roads to notice the difference.