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@coventry_eagle
BB5 has one adjustable pad, BB7 has two but the actuation arm on both only moves one pad.
You can dial in the static pad (the inner one) on both as your pads wear out. For the moving pad, you would have to adjust the cable for the BB5 to dial it in while on the BB7 you could give the little red adjuster a few turns without playing with the cables.