Nowadays, the range of wireless dropper posts on the market is growing rapidly. Among the main contenders, KS expands its Rage series with a new wireless model named the Rage Circuit.
This Taiwanese brand positions the Rage line as an affordable series focused on performance—quality at the best possible price. As the name suggests, “Circuit” designates KS’s wireless product category.
What It’s All About
KS is launching the Rage Circuit in 30.9mm and 31.6mm diameters, with 150mm and 180mm travel. Additional sizes and travel options are expected to join the Rage Circuit family soon. As a mid-range product, the Rage Circuit comes with KS’s proprietary wireless technology, a fully sealed cartridge, and will retail for under $400/€400, making it the most price competitive options in its category.
Product Details
Even if the tested product is still a pre-production prototype, the construction of the new Rage CIRCUIT appears very solid and refined: the user experience is smooth, and many design cues are inherited from its high-end sibling, the Lev Circuit. The saddle installation is very easy thanks to a 5mm double clamped screw, easy to reach with a single hex key or a multitool too. Saddle angle setting is manageable throughout a small hex key in front of seatpost head. Screw the 4mm key to point your saddle nose down, do the same with the 3mm key to rise it up.
The battery is USB rechargeable and that’s a very smart feature. You can charge it in your car or with a common powerbank if you are in the outdoors. The range is around 8 weeks and a full recharge takes 4 to 4.30 hours. The battery is located right behind the seat clamp, a position that helps to place it with ease but makes the seatpost head heavier. A good note for bike fitters and mechanics: seat offset remains the same of a cable driven dropper. One small area for potential improvement: the metallic battery clip feels a bit thin and might benefit from a more robust design in future iterations.
The remote is slightly bulky but lightweight, with a satisfying grip feel. It uses a CR2032 coin cell, which is both easy and inexpensive to replace.
Battery performance and long-term durability will need confirmation over extended use, but initial impressions are promising.
The remote and dropper communicate via KS’s proprietary 2.4 GHz wireless connection. In simple terms, this is a dedicated system developed specifically for droppers, and not reliant on traditional Bluetooth protocols—a clever solution to reduce pairing issues and improve reliability.
Configuration
Installation is quick and user-friendly, even for riders who prefer simple, plug-and-play components. Setup takes around five minutes—including the saddle. The remote offers two mounting positions to fine-tune ergonomics and rider comfort.
Right out of the box, the Rage Circuit is ready to ride. Just ensure the remote and post are turned on—look for the green LED on the seatpost head, and test the function as you would with a traditional dropper.
In some cases, a quick synchronization via the seatpost button may be needed, but the process is simple and clearly explained online.
Thanks to the closed wireless connection, pairing issues are rare—a big plus compared to Bluetooth-based systems.
Numbers
Travel range: 150 (tested) -180mm
Available diameters: 30.9 – 31.6mm
Cartridge is sealed,
no return speed setting possible
Installation time: up to 5 minutes
Service tutorial available: yes
Saddle compatibility: both carbon (oval) and metal (round) rails
Matchmaker or i-Spec compatibility: yes
Weight: 688g (without remote, 30.9mm x 150mm spec)
Recommended retail price: 399€ / 399 USD, to be confirmed)
More info at: kssuspension.com
Riding the RAGE Circuit
Uphill
Climbing support is excellent. There’s minimal lateral play, even on the 30.9mm version, and the post feels stable and confidence-inspiring.
While the dropper speed is a bit on the slower side and there’s a slight delay between button press and actuation, these are minor details that don’t detract from the overall performance.
Downhill
Descending with the Rage Circuit is smooth and predictable. Dropper response is consistent, and stability remains high.
In steep sections, I noticed slight interference with the saddle—but that’s more related to my preference for more travel. A 180mm version would have been ideal for my riding style, even on a trail bike.
The battery proved waterproof, despite KS recommending users switch to the included dummy battery before washing. A small mudguard is expected on the final retail version, further enhancing durability in harsh conditions.
Pros & Cons
PROS
- affordable price
- easy configuration
- solid construction and design
- usb rechargeable battery
CONS
- limited options for travel and diameters (for now)
- no rebound speed tuning
Final Thoughts
The KS Rage Circuit is a compelling new entry in the wireless dropper market—reliable, thoughtfully designed, and incredibly easy to use.
Its competitive price, combined with plug-and-play simplicity, makes it an excellent choice for riders looking to enjoy wireless performance without the usual extra cost.
There’s room for refinement in small areas, but overall, the Rage Circuit stands out as a well-rounded, ready-to-ride product that lives up to the expectations of today’s trail, marathon, and everyday riders.
▶️ Check out the presentation video on YouTube
Words: Tommaso Formica
Photos: Tommaso Formica / Ilaria Zampino
/ Ivan Previsdomini / Alessio Soggetti
Tester: Tommaso Formica
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