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crankset and bottom bracket removal

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crankset and bottom bracket removal

Old 06-27-08, 10:42 AM
  #1  
sunstealth
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crankset and bottom bracket removal

how do i remove the cranckset and bottom braket on a old nakamura frame (from the 80's)

its got a suntour/shimano drivetrain

i wanna paint the bike and just dont wanna shell out 25$ only to remove the crank and BB (btw thats the cheapest i found from all the LBS around here)

i need to know how minimalistic tool wise i can go short of buying the right one (substitution is also good)
and i wanna keep the crank set in good working order!

thank you!
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Old 06-27-08, 11:07 AM
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Check Sheldon Brown of course.
http://www.sheldonbrown.com/bbsize.html
That has a lot of general info on everything bottom brackets.
If you don't have pics up it's sorta hard for someone just being able to tell you how to remove something. You might have something goofy and we'd hate to tell you to do the wrong thing.
p.s. It's probably an English B.B. Super easy if you have the tools.
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Old 06-27-08, 11:22 AM
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You can spend $25 to have the LBS do it correctly or you can spend at least $25 to get all the proper tools. Sheldon Brown's site and the Park Tools site should have all the information you need to do the work yourself, but do yourself the favor of getting the proper tools for the job.
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Old 06-27-08, 11:46 AM
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Very few things on a bike either require a special tool, or to bring it to the shop to do it right. The crank/bottom bracket happens to be one of them.

Yours is probably cotterless, so you need a crank puller (can be had for $10 or less), and at that age, it is probably not a cartridge BB, so the tools would not be the same as a cartridge BB. You can probably fudge through parts of it with channel locks, depending on the specific BB... and other parts you may just want to use masking tape on it.

BTW - Do some searching for painting techniques as well... it is real easy to end up with a paint job that even if it looks good, does not adhere well.

EDIT: Have you looked for bike coops in your area? Not every area has them, but if your does, it is a good source for a do-it-yourself project.
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Old 06-27-08, 01:17 PM
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well ive been painting alot of things trughout the years from cars to bike helmets and i think ive "mastered the painting technique" i just want to have the frame as free of parts as i can to get a real good paintjob (+ i will be beadblasting the frame)

and it looks like i need a puller to remove the "crank arm/chainring assembly" i have a small CV axle puller, could this work for the job ? it looks like its a square axle

btw theresa bike coop around but its 40 kilometres away from my place

edit i can get the bottom bracket tool for like 6$

Last edited by sunstealth; 06-27-08 at 01:20 PM.
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Old 06-27-08, 01:38 PM
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You can try a CV puller, but you'll end up gouging the cranks. Here's a list of tools you'll need:

1. crank-puller (many have built-in 14mm socket as well)
2. lockring tool
3. pin-tool for adjustable-cup
4. fixed-cup tool

You can substitute non-specific non-bike tools if you want; the disassembly is easy. But putting things back together will take a lot longer with more cussing and bloody fingers. And you'll end up marring your new nicely-painted frame as well. And it's difficult to get the bearing-adjustment right without the pin-tool and lockring-tool. They have to be used at the same time in order to ensure the cup doesn't move as you lock down the lockring.
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Old 06-27-08, 01:39 PM
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It sounds like you have the painting side down...

Removing the crank may be possible with another type of puller, but I had poor luck with that sort of thing. (Of course, that could just be me). My experience was with a TA crank (a different diameter of thread than my crank puller) so I tried a gear puller, and ended up actually bending the chain rings trying to get it off... of course, this was on a very old, very corroded bike.

On the positive side, putting the cranks on requires no special tools other than a socket wrench with thin enough walls to tighten the bolts (or nuts, depending on BB type).

One trick that you may want to try to remove the cranks (at your own risk). I have never tried this, but I have heard that it can work. I accept no responsibility to any harm to anyone or anything damaged by trying this...

Loosen (but don't remove) the crank retaining bolts/nuts and ride the bike around the block a couple of times. Sometimes this will loosen the crankarms enough that you can remove them. Don't ride too long, as you can damage the tapers of the crank arms. Stop as soon as something starts to feel funny.
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