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In the premium members section, you will get a lot of info regarding loops around Ålesund. This is a small version, but you can extend it to 300-400km. This is mentioned in the alternative section on the detail page: https://cyclenorway.com/en/routes/the-worlds-greatest-day-ride/
There is also this one where you can take a bus back to Ålesund from Åndalsnes: https://cyclenorway.com/en/routes/the-wonders-of-fjord-norway/