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KTM's open-class four-stroke motocross and cross-country racers since 2007.
2007 – present · 450cc · 4-stroke
All-new platform first seen on the 2022 Factory Edition; frame reworked in 2025.
2008 – present · 450cc · 4-stroke
Redesigned XC-F line on the 2023 SX-F platform, 6-speed.
2007 – 2008 · 478cc · 4-stroke
Big-bore 478cc version of the DOHC 450 SX-F.
2008 – 2009 · 478cc · 4-stroke
Cross-country version of the 505 SX-F big-bore engine.
New chassis and bodywork, production version of the 2018 Factory Edition.
All-new 450 with chromoly frame.
New SOHC fuel-injected engine, 5-speed.
DOHC carburetted 449cc with electric start, replacing the RFS 450 SX; linkage rear suspension from 2011.
Moved to the 2019 SX-F chassis.
Moved to the 2016 SX-F platform.
SOHC fuel-injected engine from the 450 SX-F.
DOHC carburetted 449cc cross-country bike, electric start, 5-speed.