Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_39 (rider VARCHAR, speed VARCHAR)
### Question:
Which Rider finished with a speed of 81.91mph?
### Answer:
SELECT rider FROM table_name_39 WHERE speed = "81.91mph"