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_78 (rider VARCHAR, speed VARCHAR)
### Question:
Which rider from the 1971 Isle of Man Junior TT 250cc final standings had a speed equal to 86.15mph?
### Answer:
SELECT rider FROM table_name_78 WHERE speed = "86.15mph"