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I've managed to completely break the folding left-hand pedal on my Brompton. The bit where it fastens onto the crank* is fine, but the rest of it gone.

What tool(s) do I need to remove the broken pedal and fit a new one?

I'm asking this because I want to compare the price of doing it myself (pedal + tools) to the price of getting my local Brompton dealer to do it (pedal + labor + loss of self-respect).

Thanks.

*Please forgive me if my terminology is terribly wrong! :o

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Can you add a picture? –  Jay Bazuzi Mar 3 '11 at 18:04
    
"Crank" is indeed the correct term. Have added an entry for crank to the terminology index. –  Neil Fein Mar 8 '11 at 22:16
    
Brompton pedal breaks are increasingly being reported , both on folding and fixed pedals. –  user3686 Mar 17 '12 at 15:17
    
A pedal failure on a cycle is very dangerous unlike other breakages on cycles you are unable to come to a controlled stop, if the pedal suddenly breaks. I think more research needs to be undertaken on the brompton pedal failures and the potential of serious injuries. Interested to hear from others who have had serious problems with brompton pedals and what brompton are planning to do . It would be shame if a great British invention suffers from a pedal failures. –  user3686 Mar 17 '12 at 15:25
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4 Answers

up vote 7 down vote accepted

If it's a steel folding pedal, it takes a 24mm socket. If it's titanium, it needs a 10mm allen key. See the options at listed at this SJS Cycles page.

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It worked with a 24 mm socket on mine. But remember it is left hand thread. So turn the wrench clockwise to loosen! I had an annoying tick with each rotation when this pedal was on top. I noticed a fatigue crack in the titanium casing, but also there was 1 mm play between the black plastic and the vertical plate in locked position, and this could also be the cause of the noise. My Brompton is 4 years old and was used for only 1250 km with great care, so I would consider this failure of the pedal a construction fault!

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As per an email from Brompton:

...the folding pedal needs a 24mm socket to remove unless it is a superlight bike, the titanium folding pedal bolt uses a 10mm hex. The right hand pedal uses a standard 15mm spanner.

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Having never seen a folding Brompton pedal, I would assume a standard pedal wrench would do the trick. It's basically a skinny 15mm open end wrench: http://www.parktool.com/product/home-mechanic-pedal-wrench. Keep in mind the left side pedal is reverse threaded, so you'll have to turn it clockwise to loosen.

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Thanks, I'll take a look at my Brompton tonight and see if it'll work. –  Cosmic Flame Mar 3 '11 at 13:27
    
An alternative mechanism for some pedals is that they use a 6mm allen key on the other side. You can easily see if your pedals have that by just looking at where the pedal comes out the other side of the crank. I too don't know anything specific about the bromptons. –  Colin Newell Mar 3 '11 at 13:49
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According to this thread from 2009, the folding pedals take a 24mm <strike>allen key</strike> socket. (For what its worth, I would have made the same guess and assumed one could use a pedal wrench.) –  Neil Fein Mar 3 '11 at 15:30
    
@Neil: don't confuse a 24mm socket with an allen key... you're not likely to find bolts on any bicycle that need such a large key! –  darkcanuck Mar 3 '11 at 15:59
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@Neil - it's likely current, saw some folding pedal replacement bolts for sale that have 24mm hex heads. –  darkcanuck Mar 3 '11 at 16:46
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