Yet Another Cycling Forum
General Category => Freewheeling => Folders => Topic started by: Winfried on 16 March, 2018, 11:26:49 am
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Hello,
I'd like to replace the derailleur cable on a six-speed 2014 Brompton.
Problem is, even a 2mm Allen key is too big:
(https://s14.postimg.org/mikrtppyp/Brompton.derailleur.shifter.cable.end.jpg)
How do you loosen the bolt and remove the cable?
Thank you.
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I don't recall any particular difficulty when I last replaced a Brompton derailleur cable. Are you sure of the tool's size and that neither tool or bolt are deformed?
https://trade.brompton.com/Uploads/QPart/QPart-Datasheets/ds-cabdr.pdf
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As in the link above, it's definitely a 2mm allen key that's required.
(you'll want a high-quality one with sharp edges to tighten it, otherwise you'll just round it out)
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As in the link above, it's definitely a 2mm allen key that's required.
When I read it, it says:
Slacken the small grub screw in the threaded nipple TN where the cable is anchored (1.5mm
hex key needed), and withdraw the cable
A 2mm hex key is needed for the H & L stops
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Thanks much for the PDF.
Yes, it turns out it's a 1,5mm hex key for that part of the job:
"Slacken the small grub screw in the threaded nipple TN where the cable is anchored (1.5mm hex key needed), and withdraw the cable: take care not to lose the threaded nipple, which can drop out the moment the cable is withdrawn."
(https://s14.postimg.org/7tdput9y9/Brompton.derailleur.shifter.cable.end.hex.key.jpg)
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Lo and behold, the alternative Suntour shifter (https://www.ebay.fr/itm/222637391838).
(https://s14.postimg.org/fosun18v5/Brompton.Suntour.shifter.barrel.nut.png)
Since it's originally meant to lock/unlock a telescopic fork, I don't expect it to last as long as the original, but I didn't have much space left after adding bar-ends on a P handlebar.
Thanks for the help.
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Just to update this thread a bit, the new "integrated" shifter from 2017 uses a different length cable which is fitted the other way round, with the soldered nipple at the shifter. The dogleg and chainstay stops are also different, with a short cable already present inside the dogleg tube. Heath Robinson would be proud - it makes the old arrangement seem simple.