Chain length question swapping wheels with different cassettes

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Tim_Manners

Thanks @lf

I’d actually found this video pretty handy previously too..

https://youtu.be/Vg2SoOOrpE8

I’m ok with getting right length.. it was more of a question about whether I have one of the chains just set up for the 34 or the 28 only as I can use the other chain to cover x2 cassette sizes still (either 34&32 or 32&28).

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chez_jay in reply to @Tim_Manners

If you use the chain length calculator above, it'll show you that you need just one link more for 34t than 28t. So just use one chain, set up for the 34t. It'll be slightly long for the 28t but doubt you will notice it.

(You might theoretically be hitting the max capacity of your rear derailleur to take up the slack (which is the front chainring tooth difference + highest-lowest cassette tooth difference) but unlikely to cause any real problems.

Edit: assuming medium cage Shimano rear derailleur, you should be fine. Front chainring difference is almost always 16t, 34-11 is 23t, total 39t, and that's the stated capacity of e.g. 105 R7000 medium cage. And they tend to allow more than that, I have an 11-36.)

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