BoXXer Air Spring Upgrade Kit DebonAir+ ButterCup

The 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 and arms, especially on rough tracks and long descents. The refined air volumes help maintain front-end composure under braking and allow for more predictable sag setup and ride height.

This air spring kit is also the required part when changing the travel length of a BoXXer D1+ fork.

Features

• Complete DebonAir+ air spring assembly

• Refined spring curve for smoother travel and improved support

• Pre-installed ButterCup to reduce trail feedback and vibration

• Optimised positive and negative air chamber volumes

• More predictable sag and better ride height retention under load

• Required component for travel changes

• Designed specifically for downhill and gravity use

Specifications

• Air spring type: DebonAir+

• Includes: Full air spring assembly with ButterCup

• Travel options: Available in multiple lengths (model-specific)

• Intended use: Downhill, gravity, park

• Weight: Varies slightly by travel size

• Mount: Direct replacement for BoXXer D1+ (2024 onwards)

Compatibility

Only compatible with 2024 and newer BoXXer D1+ forks using the updated DebonAir+ chassis. Not suitable for earlier BoXXer models or other fork families. Ensure the correct travel length is selected to match your frame and axle-to-crown requirements.

Installation Notes

Professional installation recommended unless experienced. Full left-leg disassembly required. Clean internals, apply fresh lubrication, and torque all components to factory spec. Reset sag and air pressure after installation. Ideal to complete during a lower leg service or when changing fork travel.

Shipping

NSDynamics uses express freight services to ensure fast, reliable delivery for all service jobs and sales orders across Australia. Parcels are shipped via Australia Post eParcel/Parcel Send.

Dispatch and Delivery Timeframes

All items are dispatched once full payment has been received and confirmed. Same-day dispatch is available for orders or completed service jobs paid before 1:00 pm AEST. Any payments received after this cut-off will result in next business day dispatch.

Expected delivery time for most Australian addresses is 1 to 3 business days. Delivery time may vary depending on the customer’s location and other external factors outside NSDynamics’ control. Typical delivery timeframes around Australia are:

• WA: 2-5 working days

• NT: 2-5 working days

• SA: 2-3 working days

• TAS: 1-3 working days

• ACT: 1-3 working days

• NSW: 1-2 working days

• QLD: 1-2 working days

• VIC: 1-3 working days

Tracking and Notifications

All outgoing parcels are tracked. Tracking details will be provided once the item has been dispatched. NSDynamics does not send arrival notifications for inbound service items unless the parcel is damaged in transit or missing important components required for service.

Customers are encouraged to use tracked and insured freight when sending items to NSDynamics. Responsibility for the parcel remains with the sender until the item is received and checked in at the NSDynamics workshop.

Shipping Fees

Return express postage back to the customer is included free of charge for all full Factory and Hyperformance service types. It does not apply to minor repairs or basic services. Shipping charges for parts or accessories are calculated during checkout.

Postage to NSDynamics is the responsibility of the customer unless otherwise arranged. Warranty items may qualify for return postage coverage only if they were originally supplied by NSDynamics and a clear fault is confirmed.

Shipping Insurance

All parcels sent from NSDynamics are covered under NSDynamics’ freight insurance. In the unlikely event that an item is lost or damaged during return transit, it will be replaced with a comparable item where possible. If a parcel arrives damaged, photo evidence must be supplied immediately. NSDynamics is not responsible for parcels where the receiver has chosen the 'Authority To Leave' option. 

Packaging Requirements

Customers must ensure that their suspension is packaged securely and appropriately for shipping. If an item arrives in packaging that is damaged or unsuitable for safe return, NSDynamics may use a heavy-duty branded box and apply a $5 fee to the final invoice. This ensures your suspension is protected during return freight. Customers are encouraged to retain and reuse this box for future service bookings.

Transit Times and Delays

While NSDynamics uses express freight to minimise delivery delays, transit times cannot be guaranteed. NSDynamics is not responsible for delays caused by freight carriers, public holidays, weather events, or other external disruptions. If a parcel has been delayed more than 5 business days beyond its expected delivery date, customers are welcome to contact NSDynamics for support.

Public Holidays

Unfortunately our workshop is closed on all nationwide and Queensland-specific public holidays, so we are not able to ship sales or service orders on these days. Any services or sales orders placed on public holidays will be processed and dispatched the following business day.

New Zealand and International Shipping

NSDynamics offers international shipping to New Zealand via Australia Post. Standard delivery times range from 5 to 10 business days. Customers are responsible for providing accurate delivery details and ensuring someone is available to receive the parcel.

Goods sent to New Zealand may be subject to import duties and GST. NSDynamics does not collect or cover any customs charges. It is the customer’s responsibility to be aware of local import requirements and costs. Orders returned, delayed, or destroyed due to unpaid duties or taxes are not the responsibility of NSDynamics.

In the event that a product needs to be returned from New Zealand, including for warranty inspection, all return postage costs are the responsibility of the customer. NSDynamics does not cover international return freight for items not originally purchased from NSDynamics.

International orders are processed in New Zealand Dollars (NZD), and prices do not include Australian GST. Currency conversions may vary depending on the payment platform used at checkout.