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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.

French, Swiss, Italian or 73mm OS English BB threading.

Swiss threaded bottom brackets use the same basic dimensions and thread specifications as French but uses reverse-threading for the drive side like the British.
So IRD supply a French labeled non-drive side BB cup in the Swiss set and an unmarked drive side.

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Questions & Answers (4)
Conversion to Swiss on QB-95
13 May 2021
Hello. To use the conversion cups you write "Simply pull of the stock English cups and replace with these". I have so far not managed to do this on my QB-95 bottom bracket drive side. Do you have any advice on this? Regards Ulf Hörnberg .
As far as we can see, these are simply pressed into place, we would suggest using a soft clamped vice and a rubber mallet.

Thanks - 14/05/21 RH
threat direction
03 Feb 2018
Is the fixed cup left handed, and the non-fixed cup right handed?
Hi there,

Yes the threading is opposite so both cups thread in towards the rear of the bicycle.

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.