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I've had them since 2016 and and had no issues at all with them.


 
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R1 Concepts are made from Centric (Stoptech) blanks. Made sure the rotors you are getting are made from the premimum blanks and not the economy blanks if you go R1.
 
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I doubt you would see any problems for normal street use. If you were tracking it, go OE or better.
 

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About to instal stoptech slotted on my car next week. I didn’t want drilled rotors myself.
Agreed. On my other car I installed slotted and dimpled rotors for that reason. R1 didn't have that option so I went slotted and drilled on the V. In retrospect, I didn't think of just slotted. However, after a few years no sign of cracks.around the holes so I'm happy.
 
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No cracks on mine either and 5 years running.
 

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Just found my invoice- My how things have gone up!!

Product Rectangle Font Parallel Technology
 

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So I noticed that my friend who was Stop Tech, started rusting when compared to my R1s.

He's been happy with the performance, as have I with my "blanks" but without the rust.
 

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Only the fronts and a direct replacement, but Karch says they weigh 1.5lbs more over the OE blanks. Rear clearance is an issue if you go to 15's.
 
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