Brompton - pulling along folded = spokes click on gear chain

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JohnRGood
Posts: 1
Joined: 21 May 2019, 12:57pm

Brompton - pulling along folded = spokes click on gear chain

Postby JohnRGood » 21 May 2019, 1:10pm

Hello Everyone I have just collected my first Brompton, and so far I am very pleased with my purchase but I need some advice when the bike is folded and I push it on the three little wheels, the front wheel spokes are clicking against the little chain that goes into the sturmey archer hub. At the moment I am useing a shoe lace to pull the front wheel towards the top of the frame so the spokes do not touch what I would like to know if there is an adjustment or a better solution.
Regards
John

rfryer
Posts: 636
Joined: 7 Feb 2013, 3:58pm

Re: Brompton - pulling along folded = spokes click on gear chain

Postby rfryer » 21 May 2019, 3:32pm

I have exactly the same problem, and have never resolved it. I don't think that the front wheel is meant to drag when you're wheeling the bike, but if the ground is at all uneven, it's hard to avoid.

AndyA
Posts: 386
Joined: 21 Mar 2009, 9:16pm
Location: Edinburgh

Re: Brompton - pulling along folded = spokes click on gear chain

Postby AndyA » 22 May 2019, 6:41pm

The wheel on the mudguard is easy to break, I'd avoid using the little wheels if doing anything more than moving it around a room or whatever

Barks
Posts: 258
Joined: 14 Oct 2016, 5:27pm

Re: Brompton - pulling along folded = spokes click on gear chain

Postby Barks » 23 May 2019, 8:31am

I have the same problem and I have a rack with easy-wheels. It seems to happen as the bike leans slightly to one side due to variations on the surface and the tyre just touches the surface and moves round catching the gear chain on the spoke. It took me quite a few weeks to identify just what the clicking noise was. Now I am more used to the bike and more aware of the issue it happens only rarely - I think I subconsciously tilt the bike to the side very slightly to minimise the tyre making contact with the surface.

Brucey
Posts: 34769
Joined: 4 Jan 2012, 6:25pm

Re: Brompton - pulling along folded = spokes click on gear chain

Postby Brucey » 23 May 2019, 8:59am

Image

the toggle sticks out further than anything else just there so that is the first thing that touches. I guess if you made that part shorter something else would touch instead?

FWIW the only reason the thing has to stick out that far is that it allows the indicator rod to be set in second gear. If a shorter indicator rod were used you could have a mark on the chain (rather than the rod) and a shorter version of the RH nut could be used. The standard nut could be machined (eg preserving the radius for the chain) and made shorter.


SA make a shorter/fatter RH nut for the S3X hub, HMN420. This would use a shorter indicator rod and it would also need machining (to fit a Brompton/be the right length) but if the diameter of the tip were reduced then it could be made to accept HSL711 indicator guard. HSL711 is plastic so if it did hit the front wheel spokes when the bike is folded it wouldn't mark or damage the spokes and perhaps wouldn't be as noticeable.

cheers
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Gattonero
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Joined: 31 Jan 2016, 1:35pm
Location: London
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Re: Brompton - pulling along folded = spokes click on gear chain

Postby Gattonero » 26 May 2019, 9:53am

One of the most common problems can be the hook on the front wheel that's not aligned anymore, or is bent or loose; so the wheel does not stay straight anymore.
There is also the possibility that the tyres aren't the same size, this is easy to spot as (all else being fine) the bike doesn't stay straight when folded.
It is by riding a bicycle that you learn the contours of a country best,
since you have to sweat up the hills and coast down them.
Thus you remember them as they actually are...