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Brompton: Squeak, squeak, squeak, argh!

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Brompton: Squeak, squeak, squeak, argh!

Old 06-23-11, 08:32 AM
  #1  
Steve M.
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Brompton: Squeak, squeak, squeak, argh!

I've got a loud squeak on the LH pedal powerstroke when I've standing up and hammering.

I haven't had time to investigate fully, but neither lubing the pedal nor the elastomer shaft has helped.

Feels like a flex-related thing. What are some other possibilities?

Thanks in advance.

Steve M.
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Old 06-23-11, 08:59 AM
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bendembroski
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Crank nice n' tight?
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Old 06-23-11, 09:04 AM
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chagzuki
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I never considered the elastomer shaft would be an origin of squeaking. Bottom bracket perhaps?
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Old 06-23-11, 09:15 AM
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Steve M.
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The shaft seems to come up often in internet Brompton squeak discussions.

I haven't checked the crank. Couldn't find a schematic on the Brompton site. Just pop off the dust caps and then what's under there? Standard tapered BB?
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Old 06-23-11, 09:16 AM
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chagzuki
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Yep.
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Old 06-23-11, 11:37 AM
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fietsbob
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Grease the bolt thru the suspension block.
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Old 06-23-11, 01:39 PM
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Steve M.
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Did so, as I said, without any joy.

Does the folding pedal need some special tool to remove and grease?
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Old 06-23-11, 02:17 PM
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chagzuki
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The folding pedal uses a sealed bearing which can't be removed/replaced without serious modding of the plate it sits in. I'm not sure if any other part of it might produce squeaking.
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Old 06-23-11, 02:23 PM
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chagzuki
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The big bolt that secures it is 24mm if I remember rightly and needs a socket wrench.
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Old 06-23-11, 02:24 PM
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On other bikes, I've found the pedal-to-crank connection can squeak or tick. Looks like the folding pedal comes off with a 24 mm socket -- one of which I may actually have.
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Old 06-23-11, 05:54 PM
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jur
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I had a squeak like that once - low quality BB, the sealed bearing was not a good fit on the spindle.
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Old 06-24-11, 06:42 AM
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Most likely the folding pedal bearing. If it is I know how annoying it can be and just how long it can take to track down!

With mine I just removed the pedal (once I found a big enough socket set), prised off (carefully) the plastic dust covers and pressed some grease into the bearings either side with my finger.

It cured the squeak, squeak, I was getting at one point in the crank revolution and has been fine since I fixed it a few months ago.

Regards

Jerry

Last edited by jerrysimon; 06-24-11 at 06:47 AM.
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Old 06-24-11, 08:42 AM
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I took a 24mm socket to the bench grinder, took the edge down a bit,
to speed fitting sockets to the nut, there us a chamfered edge, inside.

so taking off enoigh edge to have the inside edge square ,
It engages what is kind of a thin. shallow, faced hex, nicely.

Used as new it would not..

The Titanium plug, in the left pedal of the lightweight version,
has a hex socket in it.. allen wrench removes it.
making the steel one the same way would be so nice.

Last edited by fietsbob; 06-24-11 at 08:47 AM.
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