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Diamondback bottom bracket

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Diamondback bottom bracket

Old 06-11-07, 08:57 AM
  #1  
newboy69
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Diamondback bottom bracket

So I have had my bike for a few years and use it daily for my short commute to work. It is a diamondback traverse and was in good condition until recently.

I do all of the work on it myself and was excited by the challenge or repairing it when my bottom bracket recently started grinding.

Having taken off the derailer & cranks etc, I am now very stuck as I am unable to track down a tool to remove the bracket itself.

The bottom bracket is labelled shimano BO1.37 but again, i can't find any item with this reference on the net. On the LHS, there is a chrome ring with six notches around the outside of it. Inside the chrome ring is a steel disc with six holes around the edges in line with the notches in the chrome ring. On the RHS there is a steel disc with flattened edges along a portion of the top and bottom.

I have attached an image of the bracket but IT IS NOT MINE, just a similar one i found whilst trawling ebay. It is entitled Shimano French thread bottom bracket.

If anybody can suggest where I can get the tool from and a suitable replacement bracket or bearing system (which will I need), that would be so helpful.

Many thanks in advance, Nick
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Old 06-11-07, 11:46 AM
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For the notches, you will want some kind of spanner wrench; the Hozan one is what I have and like. For the actual cup, I think a pin spanner will work, usually made by Park. Both can be found on this page:

http://www.bikepro.com/products/bott...ets/tool.shtml
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Old 06-11-07, 01:10 PM
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newboy69
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thanks tellyho. will get some of those ordered and let you know how i get on, Nick
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Old 06-11-07, 08:06 PM
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And you need an English bottom bracket, the most common threading. Be glad you don't need a French one. Next thing you need to match up is the spindle length, so measure that before it disappears.
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Old 06-11-07, 08:17 PM
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Sheldon Brown
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Originally Posted by newboy69
So I have had my bike for a few years and use it daily for my short commute to work. It is a diamondback traverse and was in good condition until recently.

I do all of the work on it myself and was excited by the challenge or repairing it when my bottom bracket recently started grinding.

Having taken off the derailer & cranks etc, I am now very stuck as I am unable to track down a tool to remove the bracket itself.

The bottom bracket is labelled shimano BO1.37 but again, i can't find any item with this reference on the net. On the LHS, there is a chrome ring with six notches around the outside of it. Inside the chrome ring is a steel disc with six holes around the edges in line with the notches in the chrome ring. On the RHS there is a steel disc with flattened edges along a portion of the top and bottom.

I have attached an image of the bracket but IT IS NOT MINE, just a similar one i found whilst trawling ebay. It is entitled Shimano French thread bottom bracket.

If anybody can suggest where I can get the tool from and a suitable replacement bracket or bearing system (which will I need), that would be so helpful.
This is an old-style cup and cone bottom bracket. My advice is to upgrade to a modern Shimano cartridge BB.

Those take different tools.

If you normally want to service the cup-and-cone type, you shold get a hook spanner for the lock ring (the part with 6 notches) and a pin spanner to fit the holes in the adjustable cup. It isn't necessary to remove the fixed cup (the other one) for routine service.

For the hook spanner, my favorite is the Hozan. For the pin spanner, the green handled Park model SPA-1. See: http://harriscyclery.com/tools/bottombracket

However, if you're going to upgrade to a cartridge BB those tools won't be very useful.

You can remove the lockring and adjustable cup using a hammer and punch (or an old screwdriver.) When I was a kid I used to service these that way all of the time. It is a bit tricky to make the fine adjustments that way, and the lockring is liable to get marked up...but if you're just removing and junking the old parts, that doesn't matter.

For the fixed cup, you can use a nut and bolt as shown at:

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

See also: http://sheldonbrown.com/bbsize for information on sizing.

Your frame will have a standard British 68 mm shell, but you need to find the right spindle length to work with your crankset.

Sheldon "BB" Brown
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