Brake discs Bosch or R1 Concepts

Its been just under a week after installing R1 Concept's Geomet drilled/slotted rotors and ceramic pads, I am impressed. Extremely quiet and smooth ride but once they're hot, they get aggressive.

I bought R1 Concepts front rotors for my Lexus IS250 at 85k miles. My car sits at 143k miles 5 years later and they have been the BEST rotors i have ever used. I chose their Geomet coating, and they are so rust resistant it is ridiculous. I have zero rust on the veins or hub of my brakes at all after all this time. I have used Powerstop rotors in the past on numerous vehicles, but I find the zinc coating will always rust after a few years. The R1 Concepts geomet coating is the best in my experience.

I have R1Concepts Geo-Carbon series rotors (2nd vehicle I’ve used them on), absolutely no complaints from my Giulia. I’m rocking them with Porterfield R4-S pads and the bite in dry is very nice and feels the same in wet.

R1 concepts slotted drilled rotors and pads along with some GoSpeed traction drop springs and alignment.

I’ve ran the R1 concepts D/S with OE Pads, steel lines, MOTUL 660 fluid. I’ve got them pretty hot on mountain road runs many times, no issues.

I just installed front axle drilled and slotted rotors, and new pads, all from R1 Concepts, and total cost shipped (Amazon) was $56. Tax, delivery, shims, everything but silicone grease.

Recently trying Bosch quiet cast though and have been pretty decent.

Got a 2017 lancer and did the R1 concepts. Good results after only the first two weeks. Mind you! I had two seized calipers in the back and had to replace those as well. What is stated about drilled rotors is true about the cracking if you’re using them aggressively, I bought these specific ones because I read they have the better rating out of most and since I’m using them in the winter I’m not concerned with them getting too hot to crack (please correct me if my logic is not correct) but I assumed that since the vehicle was primarily being used for cold weather it would be best to go with a more reputable brand for safe stopping power.

Installed new r1 concepts drilled and slotted rotors. After break-in, I noticed a clicking sound from both front rotors, resembling a wheel of fortune. The sound happens when a pad is in. The r1 concepts rotors are dimple instead of drilled all the way through, unlike my previous Power Stop rotors. Brakes feel great otherwise, but this pesky clicking noise when I have windows down will drive me nuts. I may go back to Power Stop.

The R1 concepts will be rusting in 3 months or less.