What calipers are stock on the HP 4 ??
The standard calipers on the HP4 are Brembo M4 calipers. Performance wise they are pretty much identical to the OEM S1000RR calipers but race brake pads are so much cheaper. You will probably be fine to fit them as they are homologated so should meet MCRCB SSTK rules. Fitting Brembo GP4-RX calipers may result in a technical infringement.
My understanding is that the HP4 OEM Brembo M4 calipers are 34/34 mm.
Would you have the part number for those paul?
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