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  1. #1
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    6 to 7 speed - same size large cog - new chain?

    I am swapping out the 6 speed on my sons bike for a 7 speed. I have a quick question on the chain though, the current largest cog in his freewheel is a 28T, if the new 7 speed freewheels largest cog is also 28T, do I need a new chain?

    Going from a 1x6 to a 1x7.

    Thanks.

  2. #2
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    You shouldn't have to. However when replacing a cog set, either freewheel or cassette it is always a good idea to replace the chain. The old chain and cogs have worn in together. If they've worn in enough it can tend to cause skipping and other shifting problems when new cogs and an old chain (or vise versa) are used together. Just depends on the wear on the chain and cogs. If the bike has some miles on it and the chain has never been replaced, I'd go ahead and replace it.

    The only other reason to replace the chain would be if you were going to a larger granny. But being that the large cog is the same size on the new it should be fine.

    Good Dirt
    "I do whatever my Rice Cripsies tell me to!"

  3. #3
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    Thanks, I am debating replacing the chain simply for the reasons you mentioned, especially as a chain is also fairly cheap.

  4. #4
    ****** to the ski hills
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    Quote Originally Posted by Squash View Post
    You shouldn't have to. However when replacing a cog set, either freewheel or cassette it is always a good idea to replace the chain. The old chain and cogs have worn in together. If they've worn in enough it can tend to cause skipping and other shifting problems when new cogs and an old chain (or vise versa) are used together. Just depends on the wear on the chain and cogs. If the bike has some miles on it and the chain has never been replaced, I'd go ahead and replace it.

    The only other reason to replace the chain would be if you were going to a larger granny. But being that the large cog is the same size on the new it should be fine.

    Good Dirt
    when replacing clogs or cassettes it is always a good idea to replace the chain.

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