Brake discs STOPTECH or R1 Concepts

I did two-piece stoptech rotors on my Viper. The solid rotors on those were 27lbs each wheel. The stoptech rotors are around 17.x lbs each. So I saved 10lbs per wheel, its a huge difference in rotating mass. I improve my MPG, not kidding and feels a lot more agile having lost that weight. The car isnt working as hard to rotate all 4 wheels!!!

Cryo Stoptech slotted rotors with Isweep 3000 short track pads front, Stoptech slotted rotors and Isweep 3000 pads rear, SS brake lines

I have used rotors from R1 Concepts for over 15 years, on vehicles ranging from a Dodge Caravan, Chevy Trailblazer, to multiple BMWs and have never had an issue. They’re high quality and good price and I highly recommend them.

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.

R1 concepts are fine not the best.

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