Avid is bracket 30 is rear 170 including stainless bracket mounting bolts
Adapts avid 74 mm callipers to fit various forksframes and rotor sizes is 51 mm international standard tabs secondary number references the smallest rotor size designed for the framefork mount 170 mm rear is adaptor suitable for fox 40 use av 7234 160 mm bracket with 203 mm rotor kit include stainless bracket mounting bolts
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