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Re: Petal disc vs Round disc
Contrary to claims about reduced unsprung weight as made by a lot of people, a 'wave' or a 'petal' may not be lighter than a similar size round disc. Reason; the design of wave/ petal makes it prone to flexing, hence the disc may need to be thicker than a round disc of similar size.
So what are the advantages? As per Sandro Milesi, G.M. of Galfer U.S.A., (Galfer holds the patents for the original wave discs), one of the advantage is the enhance bite that the wave offers due to it presenting a new edge as it touches the break pads.
The second advantage offered is enhanced cooling as the wave edge creates turbulence that pulls air onto the break pads thus cooling them. This also helps in removing break dust and keeping the disc and pads in good running condition.
Significantly, Milesi admits that wave discs are not always lighter than round discs. He says they (wave discs) were not designed with that criteria in mind. The purpose of design was as mentioned above, enhanced feeling (bite) & cooler running break setup.
For the full interview check here; http://www.motorcyclistonline.com/new-wave-brakes
While the above makes sense, there is also the fact that Brembo does not use wave rotors in any of its applications. Yet Bermbo makes some of the best breaking systems in the world. Hence, there is nothing wrong with conventional round disc. And the wave disc does not seem to offer any overwhelming advantage over conventional round disc.
Contrary to claims about reduced unsprung weight as made by a lot of people, a 'wave' or a 'petal' may not be lighter than a similar size round disc. Reason; the design of wave/ petal makes it prone to flexing, hence the disc may need to be thicker than a round disc of similar size.
So what are the advantages? As per Sandro Milesi, G.M. of Galfer U.S.A., (Galfer holds the patents for the original wave discs), one of the advantage is the enhance bite that the wave offers due to it presenting a new edge as it touches the break pads.
The second advantage offered is enhanced cooling as the wave edge creates turbulence that pulls air onto the break pads thus cooling them. This also helps in removing break dust and keeping the disc and pads in good running condition.
Significantly, Milesi admits that wave discs are not always lighter than round discs. He says they (wave discs) were not designed with that criteria in mind. The purpose of design was as mentioned above, enhanced feeling (bite) & cooler running break setup.
For the full interview check here; http://www.motorcyclistonline.com/new-wave-brakes
While the above makes sense, there is also the fact that Brembo does not use wave rotors in any of its applications. Yet Bermbo makes some of the best breaking systems in the world. Hence, there is nothing wrong with conventional round disc. And the wave disc does not seem to offer any overwhelming advantage over conventional round disc.
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