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By dramatically increasing the negative spring volume and introducing a proprietary mid-stroke support valve
fit crown race
a refined rebound circuit
Installation Notes: Flangeless seals require precise installation using a seal driver tool to ensure proper seating and performance
Firm lockout mode for extended climbs
BoXXer Air Spring Upgrade Kit DebonAir+ ButterCup Size:Air Spring Upgrade Kit - DebonAir+ w/ Butter Cup 190mm By dramatically increasing the negativeThe BoXXer DebonAir+ Air Spring Upgrade Kit with ButterCup is a complete replacement air spring assembly for 2024 and newer BoXXer D1+ forks. It brings the latest DebonAir+ spring curve to the downhill platform, offering improved small bump sensitivity, better mid stroke support, and more controlled ramp up at the end of the travel. ButterCups are pre installed at the base of the spring to absorb trail vibration and reduce fatigue through the hands
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