Author Topic: Foiled (Brompton derailleur)  (Read 1259 times)

Foiled (Brompton derailleur)
« on: January 13, 2019, 10:29:42 pm »
Recently, my derailleur started jumping on the small sprocket. Obviously I thought it might be wear, except that there was a very sudden start to the problem, after which it happened throughout every pedal stroke.

I've just taken a look, after buying spares in case. Seems as though some foil, or maybe some paper (hard to tell) wrapped itself around the sprocket and the channel between the two sprockets.

After spending a while trying to get it out, and finding it still stuck, I ended up stripping the whole lot off the hub and cleaning it completely. I think someone (Kim?) remarked that Bromptons suffer from having low gears - as in gears low down near the ground ;D

I'll keep the spares for another time.


  • Timelord
Re: Foiled (Brompton derailleur)
« Reply #1 on: January 13, 2019, 10:42:41 pm »
I don't think I can take credit for that one, though I have previously remarked that the derailleur version of the chain tensioner pulleys seem optimised for the collection of small stones and bits of twig (which they have plenty of exposure to, on account of the afore-mentioned low gears).
Careful, Kim. Your sarcasm's showing...