Sram x1 larger chainring

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I'm about to fit a new 42t chainring to my bike - currently on a 40t.
Can I get away with using the same chain? I've heard that x1 can be quite sensitive to chain length.

The Rookie

Check it in big/big to see if the mech upper jockey gets pulled into the cassette, if its OK, then you'll be fine, that's only a nominal 1 extra link (1/2 a pair) in the chain.