IRD Bottom Bracket Conversion Cups Pair
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Conversion cups for IRD QB-55 & QB-75 bottom brackets only.
French, Swiss, Italian, or 73mm OS* English BB threading. (If you require a 68mm English cup set, order the 73mm and pry out the spacers inside the cups.)
*Some mountain bikes have "oversized" bottom brackets shell width of 73 mm, rather than the standard 68 mm.
Aluminum.