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DIY Bottom Bracket Tool

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DIY Bottom Bracket Tool

Old 06-18-08, 01:04 PM
  #1  
MichelleMachete
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DIY Bottom Bracket Tool

So I'm trying to make a BB tool. Anyone know the pitch and the diameter of a crank bolt?
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Old 06-18-08, 01:11 PM
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what you mean by BB tool?

Crank Puller?

Lockring tool?
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Old 06-18-08, 02:12 PM
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buy one........unless your hobby is tool building instead of bikes. You'll spend more $$ in time than it's worth.
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Old 06-18-08, 02:36 PM
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Are you referring to cup and cone style bottom brackets? Sheldon made a fixed cup removal tool. Otherwise, it's easier (and cheaper) to just buy the correct wrench, etc.

https://sheldonbrown.com/tooltips/bbcups.html
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Old 06-18-08, 03:36 PM
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Simple question what's the pitch and diameter of a crank bolt. I know what a crank puller is I know how to remove various bottom brackets. If you don't know, I don't need you 2 cents.
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Old 06-18-08, 03:51 PM
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why don't you take a crank bolt run it up your nose; maybe then you tell the pitch and diameter.


I don't know what it is lately in this forum; but more and more posters don't have clue about common courtesy or decency. You try to help someone and all they can do is turn into a jerk.
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Old 06-18-08, 03:51 PM
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Originally Posted by MichelleMachete View Post
Simple question what's the pitch and diameter of a crank bolt. I know what a crank puller is I know how to remove various bottom brackets. If you don't know, I don't need you 2 cents.
Speaking of cranks...
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Old 06-18-08, 04:15 PM
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measure it yourself.

if you have the skills/resources to make a tool, then you should be able to measure pitch and dia.
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Old 06-18-08, 04:18 PM
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Originally Posted by MichelleMachete View Post
Simple question what's the pitch and diameter of a crank bolt. I know what a crank puller is I know how to remove various bottom brackets. If you don't know, I don't need you 2 cents.

Let's start:

Search #1 - Crank Bolt Bicycle

Search #2 - M8 Pitch Diameter

Which might lead you to this: https://www.engineersedge.com/hardwar...ead-sizes1.htm

You should really learn to use the gray matter between the ears.
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
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Old 06-18-08, 04:36 PM
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Originally Posted by dobber View Post
Let's start:

Search #1 - Crank Bolt Bicycle

Search #2 - M8 Pitch Diameter

Which might lead you to this: https://www.engineersedge.com/hardwar...ead-sizes1.htm

You should really learn to use the gray matter between the ears.
...instead of the nasty stuff on your tongue.
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Old 06-18-08, 06:39 PM
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Originally Posted by dobber View Post
Let's start:

Search #1 - Crank Bolt Bicycle

Search #2 - M8 Pitch Diameter

Which might lead you to this: https://www.engineersedge.com/hardwar...ead-sizes1.htm

You should really learn to use the gray matter between the ears.
Can't believe you actually helped him.
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Old 06-18-08, 06:56 PM
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Why would someone think WE would know this?

If I wanted to know something this odd I would bother a manufacturer of said tools.
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Old 06-18-08, 07:08 PM
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Wait a minute ... Michelle is asking about the crank BOLT, not the inside circumference of the crank arm which is where the BB tool or crank remover would go.

Maybe the idea is a spindle tool to do something with the spindle, since the crank bolt goes into the crank spindle. ???
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Old 06-18-08, 10:35 PM
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Je crois que Michelle est une doosh.
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Old 06-19-08, 06:38 AM
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Originally Posted by operator View Post
Can't believe you actually helped him.
It's more fun to shame then to scold.
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
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Old 06-19-08, 12:46 PM
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the crank bolts arent M8

I tried an M8 bolt in there on Monday...there too coarse a thread.
Might be the same as wheel axles. Which are British standard Cycle thread...shortened to BSCY.

You get bottom bracket tools that screw into the bb axle
One is on order at work. Its 60.
For removing BB cartridges.
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Old 06-19-08, 01:51 PM
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Originally Posted by griftereck View Post
the crank bolts arent M8

I tried an M8 bolt in there on Monday...there too coarse a thread.
Might be the same as wheel axles. Which are British standard Cycle thread...shortened to BSCY.

You get bottom bracket tools that screw into the bb axle
One is on order at work. Its 60.
For removing BB cartridges.

The M8 is the standard for traditional square tapered bottom brackets. You don't say what the particular bottom bracket is that you've got.
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
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Old 06-19-08, 02:46 PM
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Originally Posted by griftereck View Post
the crank bolts arent M8
Not standard M8, but they are definitely M8
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Old 06-19-08, 06:08 PM
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Originally Posted by I_bRAD View Post
Not standard M8, but they are definitely M8
Well.. there's coarse and fine-thread metric. Typically 8x1.25mm is common. But 8x1.0mm is also a valid metric size as well. Ever try looking for 7mm metric bolts?
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Old 06-19-08, 07:23 PM
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Originally Posted by MichelleMachete View Post
Simple question what's the pitch and diameter of a crank bolt. I know what a crank puller is I know how to remove various bottom brackets. If you don't know, I don't need you 2 cents.
My, my don't we have our knickers in a knot? A pitch gauge and a common micrometer would be nice to own wouldn't it?
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Old 06-19-08, 07:39 PM
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Originally Posted by MichelleMachete View Post
Simple question what's the pitch and diameter of a crank bolt. I know what a crank puller is I know how to remove various bottom brackets. If you don't know, I don't need you 2 cents.
You are such an incredible tool maker and you can't make a simple measurement yourself?

My two cents? You have no idea what you are doing and can't even take the time to make a simple measurement that any one that has ever held a mike could do in five seconds.
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Old 06-20-08, 08:29 AM
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He or she never claimed to be an "incredible tool maker", they just decided to be a little less nice than what we all expect of others here.

It's not worth it to make it more of an issue, this thread is already at three pages, more than half of which is derisive crap we've tried to stop twice by redirecting it to useful information. We've probably already driven them away from contributing anything of value.

Suggestion: Maybe the thread should be locked, and the OP can try asking again, this time a little nicer.

About the original question, I'd agree that the OP would do better to borrow a gauge/mic. and measure a few samples of bolts themselves if our information is not satisfactory.

Last edited by dsm iv tr; 06-20-08 at 08:30 AM. Reason: ed
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Old 06-23-09, 03:20 AM
  #23  
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8mm

I think DannoXYZ has the answer.

8mm with thread pitch of 1mm fits.

It is the first time I've looked at BikeForums and I hope it becomes the sort of place where you can ask simple questions without getting lots of sarcastic replies.
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Old 06-23-09, 03:29 AM
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7mm bolts

7mm bolts:
DannoXYZ, I guess you found https://www.northlandfasteners.com/ca...tricBolt_1.htm for a hex head.

In the uk we've got 7mm socket cap bolts in 25 & 45mm but we had to get them from Taiwan.

Last edited by nimroduk; 06-23-09 at 03:32 AM. Reason: clarification, added title line
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Old 06-23-09, 08:29 AM
  #25  
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Originally Posted by Herneka View Post
Are you referring to cup and cone style bottom brackets? Sheldon made a fixed cup removal tool. Otherwise, it's easier (and cheaper) to just buy the correct wrench, etc.

https://sheldonbrown.com/tooltips/bbcups.html
It's even easier to simply leave the fixed cup in place unless it's totally shot.
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