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Langaster Chainrings

AllanMAllanM Posts: 14
edited March 2011 in Workshop
HI

I'm new to this fixed game and bought a two year old Langaster this winter.
I would like to change the rear sprocket but not sure if i need a 3/32 or 1/8 sprocket.

Can anyone tell me which one i need? what the dimension refers to? and what tool is used to remove the lockring?

Thanks

Posts

  • 52Teeth52Teeth Posts: 67
    Whilst this is no complete answer it may help.

    I am guessing that the cog is held on with spacers and a standard lock ring, it is unlikely to be a threaded track type cog. You will need a chain whip and a lock ring tool, you can buy these in any bike shop.

    Good advice and cogs are available here http://www.velosolo.co.uk/shopsingle.html
    I have no affiliation to them, I bought some single speed bits to convert an old frame and they provided good service.

    As for the sizes, thats the chain width and it will most likely be 1/8.
  • keef66keef66 Posts: 13,123
    You should also be aware that you have a Langster

    If you start shopping for spares for a Lancaster you could find yourself out of pocket.
  • John.TJohn.T Posts: 3,698
    The dimension refers to the thickness of the chain and sprocket. Check your chain. If it is joined with a split link that has a hairgrip shaped circlip then it is 1/8". If not then probably 3/32". You could also measure the thickness of the sprocket. You can use either with an 1/8" chain but the correct one is better.
    The sprocket will be threaded on to the hub and locked with a LH thread lockring. You need the following tools.
    http://www.chainreactioncycles.com/Models.aspx?ModelID=58483
    http://www.chainreactioncycles.com/Models.aspx?ModelID=10184
    You may find the lockring spanner cheaper elsewhere. Not sure if this chain whip will fit an 1/8" sprocket. Best to try your local BS.
    My Fleet.
  • LazyLadyJLazyLadyJ Posts: 13
    Oh I have a langster - my chainring says 1/8.
    If you want a nice sprocket try here. Not sure they do tools though, you will need a good chainwhip (spend money on this) and strong arms if your old sprocket has been on a while!
  • mrdsgsmrdsgs Posts: 337
    alternatively, remove lockring then reassemable bike and sit on it and back pedal, that will loosen your fixed cog easily, and no tools needed other than fixed lockring tool
    Colnago Addict!
  • John.TJohn.T Posts: 3,698
    mrdsgs wrote:
    alternatively, remove lockring then reassemable bike and sit on it and back pedal, that will loosen your fixed cog easily, and no tools needed other than fixed lockring tool
    You can break a leg doing this if it has been ridden much.
    My Fleet.
  • AllanMAllanM Posts: 14
    Thanks to all for the responses and links

    Much appreciated

    Allan
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