Colin' may have said:I have observed theses on new Hayes HFX-9 G2 caliper's original pads:-
a) stack one of the pad on top of the 6" disc's "braking sweep area" and you will find that the pad
is about 2mm wider;
b) on an 8" disc, the pad stack up just nice aligned to the "braking sweep area".
In other words, having an 8" disc will enable 100% utilization of the pad's brake material
surface area.
Not sure if this is due to manufacturing tolerance, but I have also checked all Hayes pads that
available in the bike shop against all replacement disc (both 6 & 8) from Hayes, and result is
the same.
Any comment?
Economy of scale of pad production, most likely. There have been brake pads on automobiles (notably
some Chrysler front-wheel-drive cars of the late '80s and/or early '90s, if I recall correctly)
whose brake pads overhung the edge of the disc's friction surface by about 10 mm. Interestingly, on
those models, substituting a specific rotor from a different model was a bolt-on mod which produced
100% pad contact.
Pad overhang past the edge of the disc is not a problem until the pads wear enough that the unworn
shoulders contact each other. A little attention with a file at that time is warranted.
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