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I am sourcing a second set of wheels for track use. The gentleman has SP1 rotors that measure 4mm thick. The minimum stamped on my Sp2 rotors is 4mm, but I saw a post on here saying Sp1 rotors are thinner than sp2 from the factory. Does anyone know what the minimum thickness is for Sp1 rotors?
 

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SP1 front rotors are 4.5mm thick (4.4 - 4.6mm), with service limit of 3.5mm.
SP2 front rotors are 5.0mm thick (4.9 - 5.1mm), with service limit of 4.0mm
 
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