Apples and apples..F150 and a mustang are not PS trucks..weight. That and loss of friction area no reason at all to go to drilled.
Look.... if you really want to get your curly's in a knot.... you also lose surface area with slotted rotors. There's more difference to be made with the type of pad material. In terms of heat sink mass of material in the rotors drilling is probably a very small percentage lighter but negligible.
With the extra venting drilled provides vs slotted in actually keeping the rotor cool, can be compensated with extremely aggressive pads. In other words, less brake fade on extreme braking. Gas buildup between pads and rotor really isn't an issue with street driving.
But I bet any regular driver wouldn't be able to tell the difference between drilled vs slotted in real world driving double-blind trial, using the same pad material. Some even say slotted goes through pads quicker as it's wiping the entire pad surface each groove.
I wonder why they have drilled rotors on my 1L crotch rocket? Your FJR is prob the same. Nice bike BTW, buddy of mine has one. I spent a lot of time on it last year.
Bottom line is either is better than OE so you really can't go wrong.
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Last edited by westvandude; 09-28-2009 at 10:52 PM.