Tbh the first couple of sets did do some heavy braking circuits quite a few times like Bedford and Monza and were great until the cracks started appearing to the edges. I should have changed them earlier but sometimes you don't look close enough or see the inside disk.
They tend to crack as they get thinner and RS 29 are quite hard.
My gut feel at the minute is that the combination of PF discs and RS 14 will be a lot kinder to the disk.
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