First Impressions: Cirrus Cycles BodyFloat Seatpost

While most recreational cyclists will never compete, racing drives a significant percentage of the bicycle industry’s product development and marketing. Terms like lighter, stiffer, and faster are all used to describe the latest and greatest products. But what about comfort? Are comfort and performance mutually exclusive? Not according to Cirrus Cycles. The company’s BodyFloat™ seatpost is designed to improve comfort and performance by isolating the rider from high-frequency vibrations. gravel grinder BodyFloat Cirrus Cycles Specialized Power saddle Body Geometry
A late-afternoon test ride on Cirrus Cycles’ BodyFloat seatpost.

Unlike telescoping suspension seatposts, the BodyFloat post uses a linkage system that produces a vertical motion–which, according to the company–does a better job of isolating the rider (aka, the bike’s motor) from vibration. That motion, combined with the system’s undamped coil springs, results in a quicker response, which is purportedly critical for quelling high-frequency vibrations. To accommodate different sized riders, Cirrus offers four spring rates in two sizes (1.5-inch for the top position, and 1.75-inch for the lower position). When you order a BodyFloat seatpost, you specify your weight, the type of bicycle (road, mountain, etc), and handlebar style (drop or flat). For review purposes, my sample seatposts included all four spring rates, so I was able to experiment with various combinations. gravel grinder BodyFloat Cirrus Cycles Specialized Power saddle Body Geometry
The twin springs are easily changed to accommodate cyclists ranging from 50 to 260 pounds.

As I’m very particular about my saddle height, I was initially concerned that replicating my preferred position would be difficult due to the BodyFloat’s vertical movement. To be completely honest, however, once I found the correct spring rate combination (orange/orange), dialing in my fit was no more difficult than swapping saddles or seatposts. One or two short rides spent tweaking saddle height were all that it took to find the sweet spot. Fine-tuning the saddle height and spring tension was easy thanks to the post’s pre-load bolt. And because the Cirrus post doesn’t rely on rearward travel, I was able to directly transfer my saddle’s fore/aft position to the BodyFloat seatpost.

Hopping aboard the BodyFloat-equipped bike for the first time immediately reminded of me of my old Softride beam bike. That shouldn’t come as a surprise, as Cirrus’ founders and engineers were involved with the original Alsop Softride beam design. And as I would do with that beam bike, the first thing I did was check the tire pressure to see if it was too low. Like a big, soft tire, the BodyFloat seatpost’s smooth ride is immediately apparent. Unlike those beam bikes, though, there’s no lateral sway with the Cirrus post. And once you’ve selected the correct spring rates, there’s no bouncing or bobbing with the BodyFloat post.

When I began testing Cirrus’ seatpost, I discovered that I had a tendency to hover slightly above the saddle when traversing broken pavement or bumpy trails. My legs and upper body would stiffen, causing me to expend additional energy so that I could isolate myself from road buzz and chatter. As I logged more miles on the BodyFloat, that tendency to brace myself subsided. After a couple of weeks, I was taking full advantage of the BodyFloat’s isolation capabilities. On a whim, I swapped out the Cirrus post with my bike’s original rigid seatpost. Using the same saddle and tires, the difference in comfort was like night and day. Broken pavement and washboard trails that went unnoticed aboard the BodyFloat post now felt like rock gardens by comparison.

Does the BodyFloat work as advertised? Absolutely. It’s does an outstanding job of isolating the rider (aka, the engine/motor) from road shock and vibrations. With the BodyFloat, your entire body feels more relaxed. That relaxation translates to increased efficiency–and enjoyment–because you’re not wasting energy by tensing up to brace against bumps and cracks. After four months of use, I’m completely sold on the product, and can’t see myself going back to traditional seatposts on my un-suspended bicycles.

With a price of $249 for the alloy model ($395 and $415 for the carbon and titanium models, respectively), some folks will undoubtedly balk at the BodyFloat’s cost. While not exactly cheap, you could easily burn through that much money trying to find a more comfortable saddle (or worse, an entirely new bicycle). And speaking of saddles… I tested the Cirrus post with a dozen different saddles, and models that were so-so on rigid posts felt much more comfortable when paired with the BodyFloat.

Disclosure: Cirrus Cycles provided review samples for this article, but offered no other form of compensation in exchange for editorial coverage.

7 thoughts on “First Impressions: Cirrus Cycles BodyFloat Seatpost

  1. Thanks for the review. Our 2015 Salsa Fargo 2’s came stock with the Cane Creek Thudbuster ST seat post, which is similar to the BodyFloat. Just like you say, with these devices you can stay relaxed and seated while you continue to pedal over the broken pavement and worse. Once you try this, it makes you wonder why more people don’t use them – the Cane Creek suspension seat post is awesome!

    I estimated a 250 gram weight penalty for the Thudbuster ST vs. a conventional seat post. The BodyFloat appears to be similar. I will gladly continue to pay the 250 gram penalty for such improved comfort.

    One thing I noticed with the Thudbuster ST. I don’t actually feel the seat compress under me or move when I hit bumps. The bumps are much more muted than without the suspension seat post, however. Cane Creek says their seat post is designed so the seat/person stay stationary as the bike and wheel bounces up and over the obstacle. Not sure if this is true, but it sure feels like it is. I know my city bike, with a Brooks B67 sprung saddle has a lot more bounce when I hit bumps. The Thudbuster ST does not. How does the BodyFloat feel in this regard?

    1. The only time that I’ve noticed any excessive bouncing is when I unexpectedly hit a large bump or pothole (usually riding after dark). I found that the Thudbuster ST feels very muted compared to the BodyFloat, even when using a softer elastomer in the former. My understanding is that the Thudbuster’s down/back motion is designed to counteract the rear wheel’s movement on big hits, whereas the vertical motion of the BodyFloat is better for high-frequency/low-amplitude bumps.

  2. I think I need this. I have 5 bulging disc in my lower back and am in so much pain when I am on rough roads that I can’t breath.

  3. I seem to need zero setback seatposts to get me in the right position. Is this effectively a setback seatpost? Can it be adjusted to a zero setback position?

    1. Yes, the Cirrus post has an offset head. If you don’t need any setback, you’ll have to position the saddle all the way forward. Depending on your saddle’s rails, though, you may not be able to move it far enough.

      1. I actually use a zero setback seatpost AND slam the seat as far forward as I can. I must have some weird body geometry. I almost need a set forward seatpost!

        I liked my old Thudbuster ST, but I definitely found that it was moving me too far back.

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