RockShox Fork Coil Spring The RockShox Fork Coil Spring is a factory replacement for the 2010-2017 BoXXer and Domain Dual Crown forks. Whether you are replacing a worn out factory spring or changing out the spring to get a different ride quality, this spring will help to get the bike back to shredding the trails. Features: Includes one spring to fine tune the ride characteristics of various RockShox dual crown suspension forks Specifications: Color: Black Spring Rate: X-Firm Compatibility: 2010-2017 Domain Dual Crown | 2010-2017 BoXXer Race/RC/Team/R2C2