Yes, replacement CSUs are available for the 2025+ Domain C1. 1.5” tapered steer tubes feature a 59mm OD crown with an XL length (310mm) steer tube. 1.8” tapered steer tubes feature a 69mm OD crown with a standard length (265mm) steer tube.
1.5”:
11.4018.090.092 FORK CSU - DEBONAIR - 27B/29B 44 OFF-SET - 59OD CROWN- 1.5 X-LONG TAPER GLOSS BLACK (NO GRADIENTS) - DOMAIN C1+ (2025+)
11.4018.090.093 FORK CSU - DEBONAIR - 27B/29B 44 OFF-SET - 59OD CROWN- 1.5 X-LONG TAPER DIFFUSION BLACK (NO GRADIENTS) - DOMAIN C1+ (2025+)
1.8”:
11.4018.090.094 FORK CSU - DEBONAIR - 27B/29B 44 OFF-SET - 69OD CROWN- 1.8 TAPER GLOSS BLACK (NO GRADIENTS) - DOMAIN C1+ (2025+)
11.4018.090.095 FORK CSU - DEBONAIR - 27B/29B 44 OFF-SET - 69OD CROWN- 1.8 TAPER DIFFUSION BLACK (NO GRADIENTS) - DOMAIN C1+ (2025+)
RockShox service kits and spare parts are best obtained through your local shop or dealer. See our dealer locator, below, to find a dealer near you. If no one is currently listed near you, then please search for local shops via your preferred web browser.
https://www.sram.com/en/dealer-locator
Manuals and additional information about RockShox and SRAM components can be found at our service site, linked below.
https://www.sram.com/en/service
Further questions?
Reach out to Rider Support by Asking A Question at the link below.
https://www.sram.com/en/rockshox/campaigns/rockshox-rider-support