How many extra links?

notleyboy
notleyboy Posts: 14
edited July 2017 in Workshop
Hi,

I have just put the new Tiagra 4700 groupset on my wife's tourer, and she wants me to change her cassette from 11-32 to 11-34 which Tiagra 4700 supports.

So how many extra chainlinks will I need to add compared to her existing chain? Is it just 2 more links as the cassette has 2 more teeth or am I missing something?

Many thanks

Chris

Comments

  • lincolndave
    lincolndave Posts: 9,441
    Wrap the chain around the largest chainring and largest sprocket without going through the rear mech then add two whole links.
  • andcp
    andcp Posts: 644
    Before adding links, try it with the current chain length, you may find it works OK as is.
    "It must be true, it's on the internet" - Winston Churchill
  • lesfirth
    lesfirth Posts: 1,382
    Andcp wrote:
    Before adding links, try it with the current chain length, you may find it works OK as is.

    If you get a big bang when you change to big sprocket and big chainring the chain is too short.
  • notleyboy
    notleyboy Posts: 14
    Thanks all.

    Lincolndave, does that method work regardless of whether the rear mech is the short or long cage version?
  • ryan_w-2
    ryan_w-2 Posts: 1,162
    Unless the chain is seriously taught at present, I wouldn't bother adding any extra links.

    You'd be surprised on the different lengths of chain you can have on the same gearing.

    I've changed between 25T & 28T cassettes without amending the chain length.
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  • lincolndave
    lincolndave Posts: 9,441
    notleyboy wrote:
    Thanks all.

    Lincolndave, does that method work regardless of whether the rear mech is the short or long cage version?

    Yes it does, but just changing the cassette with two teeth difference, you old chain should be long enough

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