It's a GT Avalanche 1.0. The 2009 model came specced with a Rock Shock Dart 3 fork, which had an a-c measurement of 471mm.
Going rigid, I'd go 450-460mm otherwise it'll feel bargey with a sagless fork.
@Emyr started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
It's a GT Avalanche 1.0. The 2009 model came specced with a Rock Shock Dart 3 fork, which had an a-c measurement of 471mm.