Can I upgrade my current BoXXer with the Charger 3 RC2 or DebonAir+? No, both the spring and damper are designed to work as a system within the new 38mm chassis. Related articles What can I upgrade on my 2024 BoXXer to make it more like the BoXXer Ultimate? How do I add ButterCups to my base-level BoXXer? Are there differences in RockShox lower legs between Ultimate and Select+? Can I upgrade my current RockShox fork with a Charger 3 damper? What size tokens does the BoXXer use? Are RockShox coils still available in red?