IRD Bottom Bracket Conversion Cups

Question 1

Do you stock Swiss threaded ones though?

By David

20 Jun 2023

Yes, I know I can use French for the non-drive side. I can't use them for the drive side (different thread direction). I can't use British (different thread) nor Italian (different thread and thread direction). If I want to use Swiss-threaded bottom bracket shell, I need Swiss threaded drive side cup. So the question is whether you have them in stock, because it's not an option in the dropdown menu, it's just mentioned in the item description.

SJS Customer Service: · Answer

Hello & thank you for your enquiry.
Research shows that IRD supply a French labeled non-drive side BB cup in the Swiss set and an unmarked drive side, so conclude the French offering is fit for purpose.
Kind regards PC 20/6/23.

Question 2

Do you still stock Swiss threaded ones?

By David

19 Jun 2023

The only options in the drop-down menu are French, Italian and English. Do you still stock Swiss thread ones?

SJS Customer Service: · Answer

Hello & thank you for your enquiry.
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.
Hope this assists.
Kind regards, PC 20/6/23.

Question 3

Conversion to Swiss on QB-95

By Ulf H?rnberg

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 .

SJS Customer Service: · Answer

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

Question 4

threat direction

By Lennart Hendriksma

03 Feb 2018

Is the fixed cup left handed, and the non-fixed cup right handed?

SJS Customer Service: · Answer

Hi there,

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

Thanks

Question 5

what is inside diameter?

By greg

17 Jan 2018

what is the inside diameter of the cups

SJS Customer Service: · Answer

Hi there,

The measurement is 34.8mm.

Thanks

Question 6

Do You Do A Right Handed English Bb Conversion

By keith brown

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.

SJS Customer Service: · Answer

Hi,

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.

Thanks.