Mixing two campag 10 speed cassettes

normanp
normanp Posts: 279
edited November 2007 in Workshop
I would like to create a super-wide campag cassette 11-29 by mixing two cassettes. Is this a practical proposition? Obviously it would need at least a medium length rear derailleur. If it is practical what would be the best way to mix them? I would like both range and a good group of close ratios for general to fast cruising. I would use this with a 48/34 chainset.
(maybe this is covered in an old thread - apologies if so)

Comments

  • campagsarge
    campagsarge Posts: 434
    I seem to remember having some campag gearing tables lying around the house. I will have a look and see if I can find them and to see if they are relevant to your question.
  • John.T
    John.T Posts: 3,698
    Use the gear calculator on Sheldon Brown's site. I find the gear inches setting to be easiest to understand as I am an old timer who grew up with them. Read the glossary to find about the various methods. The site itself is worth bookmarking as he talks a lot of sense.
    http://sheldonbrown.com/gearing/index.html
    My Fleet.
  • normanp
    normanp Posts: 279
    Thanks for these. I wonder if the gears will function properly though when I mix cogs from 2 cassettes?
  • campagsarge
    campagsarge Posts: 434
    This is what I have found in the Campag Rear Derailleur instructions.

    Campag state that the max sprocket size on a cassette with a double chain-set for their medium cages is 28 on Veloce 10 speed and 29 on Centaur,Chorus and Record. 11 is the minimum.

    Now, you have to calculate the capacity of the rear mech to see if it will work correctly when the chain crosses the chain ring and cassette.

    Capacity is = (A-B) + (C-D)

    Where:
    A: Number of teeth on largest chainring
    B: " " " " smallest chainring
    C: " " on largest sprocket
    D: " " smallest Sprocket.

    So, in your case:

    (48-43)+(29-11)
    5+18= 23

    Your capacity is 23 which is below the max that campag recommend so you should be fine.

    I had hoped my source for this would be on the campag tech document site but I cannot find it. I got it from a document dated 03/2004 so it could be my calculations are out of date, in which case treat with caution.


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  • John.T
    John.T Posts: 3,698
    They should be OK. I have mixed Shimano cog which are more sensitive to this due to the HG system on them. You make find some changes a little more clunky than before but that is all.
    My Fleet.
  • John.T
    John.T Posts: 3,698
    I think Campagsarge is mixing up max cog sizes with max total tooth capacity. A Campag medium cage mech will take 50/34 with 13/29 (Campag data sheet on web site). As you are using 48/34 you are not exceding this so you should be OK. I asume you are on Campag. If on Shimano you will need an MTB/Touring mech(Deore or similar) as the road mech will only take a 27 teeth big cog (officially, 28 with care in setting up).
    My Fleet.
  • campagsarge
    campagsarge Posts: 434
    Yup, does not take much to confuse me I must admit! :lol:
  • KeithG
    KeithG Posts: 1,010
    If you shop around you can find non Campag branded 11/29 cassettes which are campag compatible. My LBS found me a BBB version which was cheap and very functional, I use a long cage mech though.

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