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Thread: Stripped cranks (revisiting old problem)

  1. #1
    Mojo Road Warrior TXRAiDR's Avatar
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    Stripped cranks (revisiting old problem)

    Hey folks. Got a bit of a problem. On my drive side cranks, I've managed to strip out the threads that allow me to insert and remove them with a crank arm extractor. These are older Shimano Tiagra cranks with the square taper bottom bracket. I read that a 2 arm jawed puller or steering wheel puller will work to remove the cranks. I've been to a couple of auto parts stores and seen a couple of different models and am thinking the one with the adjustable arms will work best. My concern is that I'm going to gouge the metal on the cranks, possibly ruining them. Granted most will consider them shot anyway, but I don't because these are going on my beater/commuter bike after I take them off. Anyone else have a solution that might work?
    "As long as I breathe, I attack"-Bernard Hinault
    I've got more skill on two wheels than the majority of people have on two legs.

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    MoJo PoLaR BeAr
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    Purvis Bearing on i35 also has 3-arm pullers, spread the load out.

    Put hardwood shims between the jaws and the crankarm, may help prevent aluminum gouging.

  3. #3
    Mojo Road Warrior TXRAiDR's Avatar
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    Thanks bro, I tried a three arm first and for whatever reason, the alignment was off. I couldn't get it to stay straight on the crank. I'm going to pick up a two jaw one and see if I can find some scrap shims from my girlfriend's folks who just laid down some wood floors.
    "As long as I breathe, I attack"-Bernard Hinault
    I've got more skill on two wheels than the majority of people have on two legs.

  4. #4
    Mojo Road Warrior TXRAiDR's Avatar
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    Well I've tried and I've tried, but no dice! I've been riding around with out the crank bolt in the cranks now and it's still not moving! I carry it in my seat pack, but no dice! Now I'm starting to freak out though, cause I want this mofo off my bike so I can do my conversion! I'm thinking I'm going to have to knock the old BB out in order to get at the cups. This sucks!
    "As long as I breathe, I attack"-Bernard Hinault
    I've got more skill on two wheels than the majority of people have on two legs.

  5. #5
    Speed Scrubber WildScrat's Avatar
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    Quote Originally Posted by TXRAiDR
    Well I've tried and I've tried, but no dice! I've been riding around with out the crank bolt in the cranks now and it's still not moving! I carry it in my seat pack, but no dice! Now I'm starting to freak out though, cause I want this mofo off my bike so I can do my conversion! I'm thinking I'm going to have to knock the old BB out in order to get at the cups. This sucks!
    Hold on Hoss. Take a deep breath and go to this link: Barrnett's Institute This is Chapter 20 of their 5th edition bicycle repair manual. There is a section on removing press fit crank arms when things go wrong. I hope this helps.

    Rick

  6. #6
    Mojo Road Warrior TXRAiDR's Avatar
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    Ah, a good read but I don't think it'll work. This is a threaded BB. I think I'm just going to have to get a good 3 jaw puller or fashion something of my own with a steering wheel puller. I've been working on a design with the steering wheel puller so we'll see what happens next. I've got a month to get them off so I've got a little bit of time in all reality.
    "As long as I breathe, I attack"-Bernard Hinault
    I've got more skill on two wheels than the majority of people have on two legs.

  7. #7
    Lurker crashagain's Avatar
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    Hey TXRAiDR, did you ever get that crankarm off? I've got the same problem on my mtn bike and I was thinking of getting it cut off. Because it's on the drive side, even cutting it off will be tricky, so I'm thinking of taking it to a local bike shop to get it done. I'm curious to know how yours turned out.

  8. #8
    Mojo Road Warrior TXRAiDR's Avatar
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    I'm still riding them. I ended up putting the bolt back in. Every cool down I have, I loosen it up and then spin on them and stand. Nothing yet.
    "As long as I breathe, I attack"-Bernard Hinault
    I've got more skill on two wheels than the majority of people have on two legs.

  9. #9
    MoJo|oJoM
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    Quote Originally Posted by crashagain
    Hey TXRAiDR, did you ever get that crankarm off? I've got the same problem on my mtn bike and I was thinking of getting it cut off. Because it's on the drive side, even cutting it off will be tricky, so I'm thinking of taking it to a local bike shop to get it done. I'm curious to know how yours turned out.
    If it's aluminum, you can cut it off, it's an easy job for a hacksaw. You can also takt eh bolt out and ride it around for a while, they willl sometimes come loose on their own if the bolt's out. And of course, you can always try the gear puller route. It'll do less damage to the crankarm than the hacksaw.



    Good luck!

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