Bicycle Mechanics - Removing A Peice of My Bottom Bracket

I scavenged a bike from my shop to use as a commuter bike. It was abandoned by a customer who got a car instead. I'm stripping it down and building it back up, replacing parts as needed. I've gotten everything out but part of the bottom bracket. It's a ring, screwed into the driveside of the bottom bracket shell. I've tried everything I can to get it out, and no luck. The ring has no slots for a spanner, and no visible way of getting anything clamped onto it, short of two flattened parts which I can barely grip with an adjustable. Does anyone have any idea how to get this part out? I'm replacing the bottom bracket and need this part out to fit the new one in. The bike is an extremely old Diamondback Parkway.

It does have those two flats and that's what you use. There's a special wrench that fits the flats or you can try to grab it carefully with a big pipe wrench or adjustable wrench.

Also, on the drive side of english threaded BB's that thread is a left hand thread so it's "righty loosey" so you may have been trying to tighten it more. Get some penetrating oil into the threads from the inside, let sit for a hour or two and then have at it but in the right direction.

I used a large adjustable wrench to remove the same from a way late-80s 20" DB Hilltopper.

Perhaps an oil-soak first? File flat where necessary for best interface?

I noted a neat rubber liner isolating the BB chamber from the DT and stays in mine, so everything inside was still "pristine."

What group does yours have?





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I figured it was righty-loosey. I put some oil on it a while ago and it's been sitting for about an hour, so I'm gonna go try again. thanks!

I'm not sure what group it had on it. Part of the repair work I had to do on it involved removing the derailleur and making it a singlespeed. I'm gonna continue this and make it an actual singlespeed. I don't remember what the actual group was. Nothing great.

Another way to grip it is is to use a bench vise on the two flats and use the frame itself as the lever to turn the cup out. Again, it's left-hand threaded so it removes the opposite way of "normal".

Take a look at this:

http://www.sheldonbrown.com/tooltips/bbcups.html

Another way to grip it is is to use a bench vise on the two flats and use the frame itself as the lever to turn the cup out. Again, it's left-hand threaded so it removes the opposite way of "normal".

This worked. I've got the whole thing out now. Thanks!

Also if you have it on a stand, there may be too much flex and movement to get good torque on the BB-cup. Place the frame on the stand with the bottom-bracket as close to the stand's clamp as you can.

Before I got bike-tools, big 18" Channel-Lok pliers made taking off those BB cups simple. :)