Removing rust from inside of bottom bracket cage

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  • i have been working on an old frame which i procured off the bay and have started work on it. I am used to working with metal as i am a dental tehcnician and trim metal most days, i have removed all the unwantes bits with a hand piece and diamond stones, a hacksaw, and wet sanded them down smooth, next up is to remove the rust in the bottom bracket cage but dont know how to? should i used a wire brush and some good old fashion elbow grease or shot blast it, i know from shot blasting (or air abbrading which is what i use at work) that this maybe quite harsh on the threads and by all means dont want to wear the threads down or distort them making my project completely usesless!!

    any ideas?

  • Puppy killer! ;)

  • ha!!!! leave those puppies to me, put them in sack and toss 'em over tower bridge!!!!

  • p.s. I have no usefull information to add to this thread . . .

    p.p.s. I would guess wire wool or wire brush if sand blasting will damage the threads

    p.p.p.s I just contradicted my first statement

  • some folk lore told by my grandad reckoned that pouring coke on it would be good, he used to pour it on his bycicle chains back in the day, is that bollocks being spun to me?

  • or would i end up with a stciky mess?

  • i know from shot blasting (or air abbrading which is what i use at work) that this maybe quite harsh on the threads and by all means dont want to wear the threads down or distort them making my project completely usesless!!

    any ideas?

    I think that is unlikely. I have had several aluminium frames shot/sandblasted with no problem. However I think it is quite difficult to get stubborn thick rust off that way.

    Better to apply liberal amounts of WD40 and scrub away with a stiff wire brush, in the bottom bracket you can do this in a rotating motion.

    If its even tougher, you could try an electrolyte bath.

  • or would i end up with a stciky mess?

    coke can help get light rust spots off chrome.

  • ah cool man thanks for the help, gonna use a bit of oldfashion elbow grease and some wd40 i think,

  • hammerite do a bush on rust stopper, kurust, which is good to put on after wire brushing the loose surface rust off, rust is like a virus, really, really difficult to stop. for a more severe answer use j.p.weigle cycles 'frame saver', but you have to be really careful, its really toxic, but once cured stops rust dead

  • FYI there are different types of blasting, and generally the different types are referred to interchangeably whereas they all have different characteristics and benefits/disadvantages. All use compressed air as the propellant to fire particles at the object you want to clean. Shot blasting as it suggests actually uses metal particles, and leaves a characteristic 'peened' finish i.e. very fine dimpling. Not great for threads unless used with care. Sandblasting is very abrasive and gets rid of everything including your frame if not used carefully. Bead blasting is the best but often most expensive, uses tiny glass beads and gives a very fine finish (which looks great until it rusts again) and with no damage to the threads and other fine detail on the frame. It's worth knowing what you are getting when you take your frame somewhere to be 'blasted'.
    Meanwhile, a small wire brush and elbow grease to get rid of the loose stuff then real grease to prevent recurrance is your best bet if you are not stripping the whole frame.

  • Better to apply liberal amounts of WD40 and scrub away with a stiff wire brush, in the bottom bracket you can do this in a rotating motion.

    LCB speaks the truth

  • ah cool man thanks for the help, gonna use a bit of oldfashion elbow grease and some wd40 i think,

    That's the way to do it, put a metal scouring pad on your list of tools and away you go.

  • hammerite do a bush on rust stopper, kurust, which is good to put on after wire brushing the loose surface rust off, rust is like a virus, really, really difficult to stop. for a more severe answer use j.p.weigle cycles 'frame saver', but you have to be really careful, its really toxic, but once cured stops rust dead

    do not use 'kurust' on bikes, i bought this today after being recomended by the shop keeper, got it home and phoned up the company (safety sake) and they said it leaves a black residue and to not use it on any component which is threaded as it is not ideal for....4 pounds wasted....having said that though i used wd 40 and its come up lovely with wire wool!!!

  • i have a glass bead abbrador at work but it is small, i may be able to stretch it though ;) thanks all!!!

  • Yeah my cranks are stuck rusted on. Any idea how to get off?

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Removing rust from inside of bottom bracket cage

Posted by Avatar for stringerman @stringerman

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