I replaced my previous rotors with Zimmerman ones and they also had this notch so don’t worry about it as it’s normal.
Have been putting r1concept rotors on my vehicles for 10 years. Corolla, lexus is 250, ford f150, saab 9-3, volvo xc 90. Have always gotten drilled/slotted braking performance seems to be twice as good. The last few cars I know I got my geomet rotors and ceramic pads. But 8 years ago got rotors on my lexus. Felt great never really had a problem. I was showing off in the back roads of wv, super hill, county roads. Maybe a 20 minute drive and I did have the car filled with people. Hit 95 mph a couple times. Everything was fine got back parked, my back rotors were smoking for atleast 10 minutes very visible. Still never had any issues after that. That is apparently super common. Not cause for too much concern. Never had it with any other vehicle any other time. I speed excisively. Just saying if you intend to use them for a track car I'd wanna be aware of that. Who knows if the geomet rotors would've improved things.
I used Zimmerman rotors and ATE ceramic pads all purchased from fcpeuro.com. With stock pads I could wash the car and within two days they would be brown from brake dust. Now I can go weeks before I start to notice that there may be a little dust.
With the ceramic pads I cannot tell a difference in braking, I have almost no brake dust, and the rotors still look like new.
I have a drilled and slotted set with performance pads from R1 Concepts (was going ti replace pads but 1 rotor was bad). I have had them for about 4 months now and only complaint us the squeeky pads. I have a larger vehicle (Forester) so i feel the fade a bit sooner than most, but i feel these rotors do a good job of preventing that. I dont ride the brakea that hard but its still noticable.
I used both before Zimmerman is good and cheap. Akebento are good too but hard to find and more expense. I practically used all brake pads and rotors over the 13 years I own the RRS. I would recommend using cermpads.
I have been using r1concepts brakes since my first car over a decade ago. There brakes can be found at jegs, amazon and rock auto. Compared a 2021 receipt to current. I don't have any experience with powerstop. But r1 concepts brakes are way better then factory I've gotten metallic and ceramic pads the eline and geo line of rotors. Geo was so good. Typical rotors in the winter when you park in the garage and the next day the first brake has that squeal where your breaking the rust off of the rotor the geos never had that problem. I always got drilled and slotted and it definitely significantly improved breaking and I never had an R1concept rotor fail.
Zimmerman rotors and Hawk HPS pads. Rotors are not drilled or slotted. The car stops on a dime and just saved me on the highway yesterday. This was the first modification I did and I'm glad I did it.
Zimmerman makes great rotors.
I did Zimmerman/Akebono on my e39 about 3000 mikes ago. My only complaint is the bite. It doesn't have that initial braking force the OEM pads had. It still slows the car down without fail, just a different feel.
Zimmerman and Carbotech, EBC do not hold up.
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