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The nut inside the pad holder is also spherical, and together they form a ball joint that allows the pad to be pivoted relative to the brake arm. If you use a plain bolt the pad will only ever be parallel to it.
grams-
If you use a plain bolt the pad will only ever be parallel to it
Not so, and the types illustrated all have the bolt head flat against the am when fitted. The pivoting elements are inside the arm. V-brakes usually have spherical washers both sides of the arm and the bolt angles with the pad, but that's not what's in the pictures.
gbj_tester
Question about rim brake pad holder bolts:
Shimano and other manufacturers use strange proprietary bolts with a radius under the bolt head.
Picture below: (from left to right) ISO 7380, TRP bolt with washer, Shimano bolt with washer
After thinking about it I can't see any reason why I shouldn't be able to just use a normal bolt with a washer instead of the specific bolt.
Am I missing something?