Today, KS Suspension adds the Rage Circuit to its lineup, lowering the cost of entry to wireless dropper posts. KS entered the wireless dropper market a little over a year and a half ago when it launched the LEV Circuit. That model is more of a premium offering with a $699 price tag, which was, until the latest version of the Reverb AXS came out, competitively priced compared to other high-end wireless droppers.
Much like the brand’s cable-actuated posts, the Rage Circuit has a simpler design and slots in below the LEV Circuit in terms of price. And, at $399, this is the least expensive wireless dropper post that we are aware of. Still, it shares what appears to be the same head design, battery, electronics, remote, and overall aesthetics of its more expensive sibling. As far as we can tell, the only drawbacks are that the Rage Circuit uses a hydraulic cartridge with a fixed return speed, it tops out at 180 mm of travel, and it probably weighs a bit more (although KS hasn’t published claimed weights yet).
KS Rage Circuit Details
Like all wireless dropper posts, the Rage Circuit has a completely wireless design. This makes it very easy to install and remove, and eliminates a cable and housing from your cockpit. It is currently offered in 30.9 mm and 31.6 mm diameters, and it comes in 120 mm, 150 mm, and 180 mm drop lengths. These sizes should work for a large portion of riders, except those with 34.9 mm diameter seat tubes or those requiring more than 180 mm of drop. Check out the dimensions chart below for the full rundown on insertion lengths, etc.
It shares what appears to be the same head design as the LEV Circuit. Along with the saddle clamp, the post’s electronics and battery are housed in the head. As such, it has a fairly tall stack height (bottom of the collar to center of the saddle rails) of 58 mm. It isn’t specified, but we assume it uses the same 450 mWh rechargeable battery as the LEV Circuit. That battery provides up to a claimed 55 hours of operation and recharges on its included USB-C charger.
The Rage Circuit also uses the same wireless remote as its more expensive sibling. KS uses its own proprietary 2.4GHz wireless communication system, which they claim “ensures responsive, reliable performance ride after ride.” In Cory’s experience testing the LEV Circuit, the remote provided excellent transmission speed, and he was impressed with its short throw and fast actuation, even if it was a bit bulky.
Where the Rage Circuit differs from the LEV Circuit is the hydraulic cartridge. While the LEV Circuit has an adjustable air spring to allow users to make changes to return speed, the Rage Circuit does not. That’s not necessarily a bad thing, assuming the fixed return speed is reasonable. Plus, KS states that the cartridge is easy to replace should the need arise.
KS Rage Circuit Features
- Wireless actuation
- No cables or connectors
- 2.4GHz wireless proprietary communication system
- Quick signal transfer between remote and dropper seat post
- Removable and rechargeable battery
- Remote powered by a CR2032 battery
- Hydraulic cartridge with automatic reset functionality
- User-friendly cartridge design for easy replacement
- IP67 rated (dust-tight and water-resistant)
- Remote, battery and charger included
KS Rage Circuit Dimensions
Overall, the Rage Circuit has fairly standard dimensions. Its overall and insertion lengths are a few millimeters shorter than the LEV Circuit, as that post has an air valve sticking out of the bottom. Based on my calculations, the stack height of the Rage Circuit is 58 mm, which is ~4 mm shorter than the latest Reverb AXS and 11 mm taller than the Fox Transfer Neo. Regardless, it’s respectable considering the challenge of housing electronics and a battery in the head of a seatpost.
Weights were not provided for the Rage Circuit, nor are they listed on the brand’s website yet.
KS Rage Circuit: Pricing and Availability
With a price that’s fairly close to premium cable-actuated posts from some other brands, the KS Rage Circuit aims to make wireless dropper posts more accessible. For $399, it does exactly that. That price includes the dropper, wireless remote, battery, and charger. Assuming it works well and comes in the right size for you, it seems like a really solid value.
The Rage Circuit officially launches today, and we expect it to be available soon from KS’s retail partners. Until then, you can learn more about this new dropper and the rest of KS’s products on the brand’s website.
