38tooth chainring on Focus Jam2?

Why a 38, seems like it would not be geared low enough for serious climbing even if it had a 50t on the cluster?
 
It fits.

38tooth chainring on Focus Jam2.jpg
 
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Hi, please describe how you did it! Was it necessary to extend the chain or replace it with a longer one? What specific 38z chainring did you use?
 
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