IRD Bottom Bracket Conversion Cups Pair

Conversion cups for IRD bottom brackets.

French, Swiss, Italian, or 73mm English* BB threading available.

Please note these are left and right cups only and require the purchase of an IRD bottom bracket in order to guarantee compatibility. We stock the QB-55 in all sizes here.

*If you require a 68mm English cup set, order the 73mm and pry out the spacers inside the cups.

Aluminum cups, Made in Japan.