52-14 was enough and 42-11 is enough, but that's just my opinion. For myself I'd be more worried about 42-32 being enough. SRAM was kind enough to make their 10-42 cassette compatible with their road 1x groups.
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."