| Jon,
To my surprise my 'Braking' waveys turned out heavier than the standard '01 748R Brembo discs that I replaced. i thought part of the beneift of wavey was less unsprung weight. Turns out to be not the case in my instance.
Std '01 748R Brembos = 1355grm each
Braking STX62D Wavey = 1375grm each
Not saying this will be the case in all configurations but if you have the later Ohlins OEM forks and the Brembo P4 calipers that cater for a bigger offset on the discs then you may well find that the model of waveys that fit this setup, will be slightly heavier too.
Hope this helps.
Regards, Guy | 
Guido
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