I was wondering what information people have on the j-hooks. I realize that other discs that claim benefits such as drilled and slotted are very much cosmetic more than anything. So, it is my initial thought that this design is just something new to grab people's attention without having any real braking benefits.

I keep hearing that AP is the one who came up with this, and this type of rotor should therefore be credible in and of itself. I haven't heard too many lofty things about them, except for having a better initial bite, but I have yet to find any information as to why the initial bite would be improved - they just say that it is. At least with the slotted and drilled designs, companies can feed you some sort of BS about how your brakes stay cool as an ice machine with all that air going through them and letting that nasty gas and dust escape! But there doesn't seem to be very many claims or info. on the j-hooks.

So, in short. Has anyone used these and felt an actual improvement?

Does anyone care to theorize WHY this j-hook design would improve the initial bite of the pads?

All comments/information on this subject would be appreciated. Thanks!

 

So, no one who has viewed this thread knows anything about these rotors? Interesting.

 

AP's site says " RA = J hook design.
Latest design gives improved bite and debris clearance and reduces distortion / vibration, outer grooves run out to outside diameter"

I'm no expert but the design looks like it has better surface area than slotted or drilled, since there's more rotor material, and the hooks alternate vs being linear like slotted or being cross drilled.

I guess to really merit it's value its to compare it to the other rotor types:

AP racing Disc Face Types

 

Right... but a standard disk has more surface area than any type of drilled,slotted, or hooked rotor, which on paper would seem more beneficial. This design does give more surface area than slotted or drilled, but taking any area from the disk at all should yield some sort of improvement (logically speaking). In this case the improvement over the slight loss in surface area is, "improved bite and debris clearance."

I am trying to figure out WHY this design would give more bite, and why debris clearance is even an issue.

Is it as simple as saying that the little parts of the pad have something to literally hang on to as it pressed down on these little hooks?

 

Debris clearance is an issue because the leading edge and the middle of the pads also generate dust. Whether or not it leads to any real improvement in braking is likely a highly controversial subject.