just getting back into cycling

Discussion in 'Cycling Archive' started by Ed, May 16, 2012.

  1. Ed

    Ed Guest

    Hi All,

    What's the easiest way to change the cranks? If I'm doing this, should I
    replace anything else at the same time?

    Thanks
     
    Ed, May 16, 2012
    #1
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  2. Ed

    Clive George Guest

    Ooh, such a short question, so much possibility of a long answer :)

    But mind if I ask some questions first?

    1) Why do you want to change the cranks? Pedal threads knackered,
    attachment to bottom bracket knackered, chainrings worn out and not
    replacable are all entirely good reasons, and there are probably more,
    but I tend to change chainrings rather than cranks.

    2) Is your bottom bracket knackered?

    3) What sort of cranks do you have, and what sort do you want? Size and
    number of chainrings, bottom bracket type are the main things to know about.
     
    Clive George, May 17, 2012
    #2
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  3. Ed

    Ed Guest

    You may indeed!
    Well, back in Oct I moved outside of walking distance to work, so, long
    story short I now have a second hand bike from paper which I got at the
    knock down price of £25. It happens to be a Falcon Interceptor, seems to
    have a nice sturdy frame. However, both pedals happen to be at about
    20degrees to the horizon. I can't undo the pedals with a 6mm hex, I
    think the threads are knackered. Changing the crank so that I can have a
    chain guard would be advantageous.
    I don't know but there is a slight squeak when my foot is in the
    lowermost position, what could that be a sign of?
    Most of the time the bike is in the uppermost gear, I like the ratio of
    few turns to maximum gain in distance :)
     
    Ed, May 17, 2012
    #3
  4. Ed

    thirty-six Guest

    That's not surprising. The appropriate tool is a pedal spanner which
    engages with the flats on the axle next to the crank face. It is
    usually about 14 inches long and possibly not only requires full body
    weight to operate but also some shock or bouncing.
    Plus-Gas may be appropriate to unseize a thread. May take 20 minutes
    for simple easing or 2 days to penetrate and dissolve any corrosion to
    free the threads.
    Stiff knees, starch in your underwear. ;-)
    A notion which is generally wrong. Conditioning with easier gears
    will have you riding faster and with less effort and pain in a few
    weeks of daily riding.
     
    thirty-six, May 18, 2012
    #4
  5. Ed

    Clive George Guest

    Mouse on the floor?

    More seriously, if you spin the cranks round without a chain on, do they
    move freely?

    Does the axle wobble in its bearings?
    Any of the other information? Bottom bracket type is a useful one.

    I'm guessing price is a significant consideration here. And I've some
    bad news : fitting a new crank could well cost you more than 25 quid.

    http://www.edinburghbicycle.com/products/shimano-fc-m171-chainset

    is the cheapest chainset EBC do. 30 quid. The 28/38/48 ring one is the
    one you'll be after. Has a chainguard :)

    That fits a square taper bottom bracket, which is the one you've
    probably got at the moment.

    To remove the old cranks, you'll need to take the nut or bolt off then
    pull the cranks off with a tool such as this :

    http://www.edinburghbicycle.com/products/park-cotterless-crank-remover-cwp7

    That's 17 quid, so we're now at 47 quid. For me, spending money on tools
    I'm going to use again isn't a problem, but you need to work out if it's
    worth your while.
     
    Clive George, May 21, 2012
    #5
  6. Ed

    Rob Morley Guest

    Alternatively this
    http://www.ebay.co.uk/itm/250872942476
    and this
    http://www.ebay.co.uk/itm/150663754724
    for only 20 quid.
     
    Rob Morley, May 21, 2012
    #6
  7. Ed

    David B Guest

    "Clive George" wrote in message
    Alternatively Pop into your local bike shop and ask them to take it off for
    you.
     
    David B, May 21, 2012
    #7
  8. Ed

    Ed Guest

    How do you replace that, it looks like it needs a square tool. Not sure
    that I have anything that'd fit it. Although the price looks spot on,
    that's something that I could afford.
     
    Ed, May 23, 2012
    #8
  9. Ed

    Rob Morley Guest

    The second link I posted was the tool you'd need.
     
    Rob Morley, May 23, 2012
    #9
  10. Ed

    Ed Guest

    Makes sense! Thanks - I think I have bought one of those already.
     
    Ed, May 24, 2012
    #10
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