Thorn Cycles Forum
Community => Non-Thorn Related => Topic started by: Andyb1 on September 10, 2023, 08:42:20 PM
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Does anyone know the thread used on the Brooks nose adjusting nut - the one that adjusts the saddle tension?
Mine keeps slackening off and I want to add a second one as a locknut.
I guess it is a whitworth thread?
Thanks
AndyB1
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If your saddle uses this tension pin then according to SJSC who answered a similar question about this item, the thread is M8 (see the Questions and Answers). Otherwise I’m afraid I don’t know.
https://www.sjscycles.co.uk/saddles/brooks-tension-pin-assembly-64-mm-with-nut-zinc-bmp173/
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Can you loosen the nut and apply some blue (low strength) threadlocker then retighten?
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Thanks for the replies -
- the thread on mine does not look like metric, I read elsewhere it was 5/16 bsf so have ordered a couple of nuts to try. I think later ones may be M8.
- I have tried locktite but the nut still loosens. Maybe grease under it, or the movement of the saddle just rocks it loose?
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My tensioning nut on wife's previous B67 started to loosen after a few years. We were on a long tour when this became a problem and so after struggling for a few days I simply superglued it after setting the correct tension. It never needed to be retensioned after that because the rails both snapped about a year later (but that is a story on its own).
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Hi,
The nut thread is 5/16 BSF on my Conquest saddle which is about 20 years old……but the bolt part was worn so a locknut could not be used. Anyone want a couple of 5/16 BSF plated nuts?
I have just ordered a new unit from SJS with adjuster nut, and that may be metric.
Once apart I realised why the locktite had not worked - the threads were filthy.
Thanks again for the replies.
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The new adjusting bolt is also 5/16 BSF threaded so I added a locknut in front of the adjusting nut.
The Conquest saddle has rear springs which will allow the saddle to rock from side to side much more than a B17, so that is maybe why it loosens?