Re: [CR]Stuck bottom bracket cup... help

Date: Sat, 28 Jul 2007 13:31:26 +0100
From: Hilary Stone <>
To: Fred Rednor <>
Subject: Re: [CR]Stuck bottom bracket cup... help
References: <>
In-Reply-To: <>
cc: Julius Naim <>
cc: Julius Naim

The best solution is as:

A 16 x 100mm bolt and two nuts will take out even the most stubborn fixed cup. Screw one nut down about four cm, place the end through the fixed cup from the inside and screw on the second nut on the outside. Tighten this nut with a socket whilst holding the bolt head with a spanner. Then continue turning the outside second nut until the cup unscrews.

This will take out any fixed cup without damaging it.

Hilary Stone, Bristol, England

Fred Rednor wrote:
> Also, if you're lucky, a good 16 mm cone wrench will work; e.g.
> one with _really_ flat jaws.
> Fred Rednor - Arlington, Virginia (USA)
> --- Mark Stonich <> wrote:
>> Park used to make a light duty tool for these. Because they
>> were
>> handy for adjusting the adjustable cup, without removing the
>> crank
>> arm., I've been watching on Ebay for months and haven't seen
>> one come up.
>> If it isn't stuck too badly, Sheldon Brown's Big Bolt method
>> will work.
>> Go to and scroll
>> down.
>> But friction has it's limits. Because the Raleigh type cup
>> has so
>> little surface area on the outside, if you start to apply too
>> much
>> force you can damage the brittle flats and still not get the
>> cup
>> off.
>> When this happened to me I tracked down a Kingsbridge tool.
>> This
>> also works by friction but has a finer thread pitch, so
>> pressure is greater.
>> When even this wouldn't do the job, I made my own tool that
>> bolts
>> snugly to the cup and can't come off the flats. It worked so
>> well I
>> had more made and they have been selling rather
>> well.
>> I've sold
>> 40+ in a few months and many customers say they'd tried every
>> other
>> method first.
>> So far I know of only one cup the tool couldn't remove. They
>> stuck
>> the tool in a vice and two stout lads tried to unscrew the
>> frame from
>> the cup. That one was so thoroughly stuck, the frame bent
>> from the
>> force applied. Even then neither the tool nor the flats on
>> the cup
>> were damaged.
>> At 7/27/2007 09:15 PM +0100, Julius Naim wrote:
>>> Hi
>>> Can anyone help. I have a bottom bracket cup I need to
>> remove that's
>>> stuck and I can't get it to unscrew. It's the type often
>> found on
>>> Raleigh bikes with what I think is called a wrench flat (a
>> strip
>>> across the middle), it's too flat to get enough grip with an
>>> adjustable wrench and I don't have a workbench that I could
>> use a
>>> vise to try and get more grip with.
>>> Can anyone tell me what park tool would fit. if they do one
>> that is?
>>> Or is there an easier way to tackle it?
>>> Thanks for any help.
>>> Julius Naim
>>> London UK
>> Mark Stonich;
>> BikeSmith Design & Fabrication
>> 5349 Elliot Ave S. - Minneapolis. MN 55417
>> Ph. (612) 824-2372