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Replacing old bottom bracket

Old 07-30-12, 08:33 PM
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Replacing old bottom bracket



Hi. I have an old Raleigh Mustang bicycle that I bought in the United Arab Emirates while stationed there during Desert Storm. It is a low-end bicycle, but I wanted to keep and use the frame for sentimental reasons. I have replaced many of the components, but I cannot seem to find a bottom bracket for it. I am posting a pic of the current one. It is large, 2" diameter.

Any help is appreciated. Thanks
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Old 07-30-12, 09:43 PM
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If you have the proper tools, pull the cranks off both sides, then remove the left side by cup. If the cups are good as well as the bb axle, you may just need some new bearings and grease only.
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Old 07-30-12, 10:07 PM
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That's a frame for a 1-piece crank with a special BB for 3-piece cranks; not so common.

Agree you should prolly re-use it; it has much larger bearings than 3-piece BBs, so it's prolly fine unless you've ridden it a long way poorly adjusted.
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Old 07-31-12, 12:03 AM
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Originally Posted by Kimmo
That's a frame for a 1-piece crank with a special BB for 3-piece cranks; not so common.

Agree you should prolly re-use it; it has much larger bearings than 3-piece BBs, so it's prolly fine unless you've ridden it a long way poorly adjusted.
As Kimmo said the bottom bracket shell is referred to as American and the bottom bracket is usally a one piece or "Ashtabula" (I have no idea where the name comes from). There are two kinds of square taper BB the will fit your BB shell; open and sealed bearings. Yours probably has the open variety such as this conversion https://www.amazon.com/Pyramid-Piece-.../dp/B000AO9O12. You can also buy the sealed bearing variety that look like this https://www.danscomp.com/products-PAR...Sealed_BB.html. The BB should come apart following these instructions https://www.parktool.com/blog/repair-...racket-service even though yours have separate crank arms. Kimmo is also correct that these BB weigh a ton, but they use large ball bearings and are pretty much bullet proof unless they come loose and you ride that way for a while.

Last edited by onespeedbiker; 07-31-12 at 12:06 AM.
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Old 07-31-12, 01:58 AM
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Thanks for the responses everyone. I have the proper tools, so I think I will start by getting the old BB out and seeing if it can be re-used. If not, onespeedbiker's links will come in very handy.
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