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Apidura Dropper Post Collar/Adapter (for Backcountry Saddle Packs)
Best stability solution for mountain bikers using dropper posts with saddle packs.
Hey there! If you're riding a mountain bike with a dropper seatpost and love using your Apidura Backcountry Saddle Pack, this custom-made Dropper Post Adapter is exactly what you need. It's cleverly designed to keep your pack securely fastened while also limiting the travel of your dropper post, which helps prevent any nasty damage to either the post or your bag. It comes ready to go with shims to fit dropper posts with 30.9mm, 31.6mm, and 34.9mm lower diameters, and installation is a breeze with just a 3mm hex wrench. Plus, the broad, flat rear section and ridged strap retainer mean your gear stays super stable even when the terrain gets rough. It's also versatile enough to work with any bag that uses a 25mm seat post strap or smaller!
$45.30
Owner Satisfaction
4.5
/ 5
Category Rank
2445
/ 3913
#2445 in Bicycle Tools
Price vs Category Average
-22%
Below average
Who it's for
- Bikepackers needing dropper post compatibility for large saddle bags
- Riders seeking a stable, sway-free setup on technical terrain
- Cyclists wanting to protect expensive dropper stanchions from abrasion
Who should skip it
- Users relying on saddle packs from other manufacturers
- Weight-conscious riders avoiding extra gear and added costs
- Cyclists with limited seat post clearance or complex frame geometries
Performance breakdown
Dropper Protection
Effectively prevents bag-to-tire contact by limiting post travel during compression.
Installation Simplicity
A single 3mm hex bolt makes setup quick and frustration-free.
Compatibility Range
Included shims cover the three most common mountain bike post diameters.
Stability Under Load
Ridged strap retainer keeps heavy saddle packs from swaying on trails.
Build Durability
Robust construction withstands the harsh vibrations of aggressive off-road riding.
Versatility
Works seamlessly with any bag utilizing standard 25mm seat post straps.
Key Specs
Designed to work with MTB dropper posts with a 25mm or 26mm upper section diameter
Injection moulded glass-reinforced nylon for durability
Silicone shim for a secure fit
Dimensions
4.5 x 4.8 x 3.5cm
Weight
53g
Know before you buy
Without an adapter, a saddle pack can rub against your tire or frame when the dropper post is compressed. This collar provides a secure mounting point that prevents the bag from sagging and limits the post's travel to avoid damage to both your gear and the seatpost mechanism.
The adapter is designed to be highly versatile. It includes shims that allow it to fit the three most common dropper post lower diameters: 30.9mm, 31.6mm, and 34.9mm.
Yes. While it is optimized for Apidura Backcountry Saddle Packs, it is compatible with any saddle bag that utilizes a seat post strap of 25mm or narrower.
Installation is straightforward and requires only a 3mm hex wrench. You simply select the correct shim for your post diameter, position the collar, and tighten the bolt.
It does not affect the mechanical action of the post, but it does physically limit the maximum drop. By preventing the post from fully compressing, it ensures your saddle pack stays clear of your rear tire.
Still have a question?
Ask Hayley anything about this product before you decide.