Frozen rotors. Never had issues with mine. I used to get lots of surface cracks with Z1 rotors a long time ago. I never tried others because these work and are cheap, even more so if you forgo slotting and the promo code fr2015.
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GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere. Full Specs
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