The best replacement for 12-27 cassette is 11-28.

The best alternatives to 12-27 cassette are rated as following:
★★★★★  11-28
★★★  12-25

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Speaking about 12-27 cassette, one probably shouldn't forget about compact crank.

Other search terms related to 12-27 cassette and their ratings are:
★★★★★ compact crank
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Google Trends

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12-27 cassette
11-28
12-25