Need help finding tool to remove cranks off old bike
03-21-11, 02:31 AM
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Need help finding tool to remove cranks off old bike
Alrighty, so I'm converting my old road bike ("Swiss Olympic" from the late 70s / early 80s, I dont know more about it) to a fixed gear and I've come to the point where I have to remove my crank to get rid of the chain ring I don't need. The problem is I've looked around online but I haven't found a type of crank fixture remotely close to mine, so I have no idea what kind of tool to use. Here are a few pictures to show you what I mean.
Thanks!
Thanks!
03-21-11, 02:44 AM
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Your pic aren't working, so it's hard to provide help. There's been a few different crank designs over the years. There's the one-piece(ashtabula) crank, the cottered cranks and the currently dominating various versions of cotterless cranks. (square taper, octalink, ISIS...)
I'm guessing you might have cottered cranks in which case Sheldon Brown have a bunch of useful things to say, as usual.
I'm guessing you might have cottered cranks in which case Sheldon Brown have a bunch of useful things to say, as usual.
03-21-11, 10:18 AM
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Yup, Appears to be a cottered crank.. tapered cotter has to come out.
Older bike shops have a press to remove them, without damage.
Just banging them out usually requires fitting new cotters.
If you go that route , put the nut back on loose , so you have less chance of damaging the threads , , bang on the nut .
Cotters are soft steel , by design.
Older bike shops have a press to remove them, without damage.
Just banging them out usually requires fitting new cotters.
If you go that route , put the nut back on loose , so you have less chance of damaging the threads , , bang on the nut .
Cotters are soft steel , by design.
Last edited by fietsbob; 03-21-11 at 11:29 AM.
03-21-11, 11:19 AM
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Those are cottered cranks -- not very common anymore. As you might expect, Sheldon Brown has an article on how to deal with these: https://www.sheldonbrown.com/cotters.html
As mentioned above, a cotter press is the best way to extract the pins without damaging them. In any case, check with your local shop(s) to see if they stock replacement cotters. If they do, they may also have a press to properly remove and install them.
N.B. Cotter pins come in several diameters and many tapers. The diameter is the most important dimension to match -- it is quite typical to have to file the taper on replacement pins.
As mentioned above, a cotter press is the best way to extract the pins without damaging them. In any case, check with your local shop(s) to see if they stock replacement cotters. If they do, they may also have a press to properly remove and install them.
N.B. Cotter pins come in several diameters and many tapers. The diameter is the most important dimension to match -- it is quite typical to have to file the taper on replacement pins.
