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Tiagra 4600 12-30

Old 04-11-17, 11:39 PM
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Tiagra 4600 12-30

Right now I am using a road bike with the Tiagra 4600, 11-25 cassette. I want to upgrade it to 12-30.

My question is:

Do I need to change the chain or add a new link to the chain when I go to 12-30?

Can friends with similar experience share their thoughts?

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Old 04-12-17, 06:15 AM
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Theoretically your chain will have to be 2-1/2 half-links longer, say 3 half-links but they come in pairs so you will really need 4 half-links or two full links more. Does you current chain have this much slack when shifter into big-big (50x25)? If not you need a new chain.

However, as a general rule a new cassette should be mated with a new chain so that will solve your potential length problem automatically.
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Old 04-12-17, 08:02 AM
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Use a new properly sized chain and save your old cassette/ chain combo for future or emergency use.
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