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Questions & Answers (2) Q & A
Retrofit your IRD QB-55, QB-75 or QB-95 bottom bracket with these cups to make it compatible with non-English threaded frames.

Simply pull of the stock English cups and replace with these.

For IRD bottom brackets only.

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Questions & Answers (2)
what is inside diameter?
17 Jan 2018
what is the inside diameter of the cups
Hi there,

The measurement is 34.8mm.

Do You Do A Right Handed English Bb Conversion
01 Aug 2016
I have a "made in Germany" old mixtie frame with what appears to be right handed threads both sides. I have a sealed unit of 1.37 x 24tpi type which fits on the non driven side. As the standard is a left handed thread on the driven side it will not fit so I need either to find a sealed unit with both sides using what I think is english right handed, this appears impossible, or if you do threaded replacement for the driven side which can replace the left hand side of the BB I have. Any help would be appreciated.

Although these IRD cups in the French option is the correct thread for your frame, as they are designed for use with IRD bottom brackets I don't know how well they'd work with other manufacturers of bottom bracket I'm afraid. For an unusual frame we normally recommend threadless bottom brackets that are normally designed for damaged threads.