Fire” was played in concert for the first time on 27 May 1981 a month after the album version was recorded. It was the second of two songs from the October album played on the Boy Tour with the first being “I Fall Down”. “Fire” was a set list regular for much of the October Tour, although it was not played at any of the tour’s shows where U2 acted as support for the J. Geils Band. It then appeared on the War Tour‘s “Pre-Tour”, and its last live performance was at the first proper date of the War Tour on 26 February 1983. Most of its live appearances were in the encore, often as the first encore song. “Fire” was also the song U2 played for their first appearance on Top of the Pops.
The July 1981 single release came in three versions – a two-track 7-inch vinyl, a double 7-inch vinyl pack, and a 12-inch vinyl single titled “U2 R.O.K.,” a pun on the word “rock” and on the phrase “U2 are OK.” A fourth version was released ten years later on CD in 1991, also under the title “U2 R.O.K.”