Klaassen and sighted pilot Imke Brommer won the gold medal in the women's time trial B event at the 2020 Summer Paralympics held in Tokyo, Japan.

Together with sighted pilot Haliegh Dolman she won the silver medal in the women's 1 km time trial B event.

[3] At the 2016 UCI Para-cycling Track World Championships held in Montichiari, Italy, Dolman and Klaassen won the gold medal in the women's 1 km time trial.

At the 2019 UCI Para-cycling Track World Championships held in Apeldoorn, Netherlands, Klaassen and her sighted pilot Imke Brommer won the silver medal in the women's time trial 500m B event and the bronze medal in the women's sprint B event.

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