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@kerley
Or just work it out using online calc or this which is good enough;
42/16 * 27 = 70.875
42/15 * 27 = 75.6
44/16 * 27 = 74.25
Going to 74 or 75 from 70 will be pretty noticeable. And while fine tuning is easier done via chain rings it can be more expensive and more difficult to find chain rings in un-common sizes, i.e. 43 to get an in between gear in examples above.