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Owner's manual


BodyFloat™ 3.1 Owners Manual


Congratulations! Thank you for purchasing the very best in seatpost technology. BodyFloat™ is a precision component, designed to give years of comfort and service with proper adjustment, care, maintenance and (appropriate) use.

Please follow instructions carefully. We welcome questions or concerns, feel free to call us! Our phone number is 360-392-8302.  We are open Mon-Fri from 9:00am to 5:00pm PST.

1. Go for a short ride on existing seatpost/saddle.

Cirrus Cycles recommends taking a short ride on your existing bike/saddle setup as described below on the ‘Adjusting BodyFloat™’ page.  Not only will the BodyFloat™ improve comfort and performance of your bike but may also open the opportunity to find the perfect saddle for your anatomy, riding style and your personal comfort & performance metrics.

2. Measure current saddle position - with bike standing upright on level ground:

a. Measure and record saddle height: distance from center of bottom bracket (cranks) along seat tube to top of saddle.

b. Measure and record saddle fore/aft: distance from stem binder bolt to forward tip of saddle

c. Measure and record approximate saddle tilt: use a bubble level along length of saddle top.  Follow saddle manufactures recommended tilt, if any.

d. Measure stack height: distance between top of bike seatpost binder mechanism to the middle of saddle rail.  BodyFloat™ requires a minimum of 9 cm (3.6 inches) of stack height.

3. Remove existing seatpost:

a. Unclamp seatpost where it inserts into frame (may be a bolt, nut, or lever).

b. Remove seatpost by pulling upwards.  Gently twist and pull the seat if there is resistance in seat tube.  If necessary, take to a local shop for assistance.

4. Determine existing seatpost diameter:

a. After removing seatpost, look for a number stamped on the tube, i.e. 27.2, 31.6, etc.  There are many different seatpost sizes on the market. If current seatpost is a larger size, a seatpost shim will be necessary.  Shims are available from most bike shops or from Cirrus Cycles.

b. Custom seatpost sizes are available, please contact Cirrus Cycles for availability and additional information.

Note: If  old post is smaller than 27.2, the BodyFloat™ will not  fit. Forcing the BodyFloat™ into frame can damage both the BodyFloat™ and the frame.

5. Remove old saddle:

a. Undo old seat clamp bolts/nuts and remove saddle from old post.

b. Clean rails and underside of old saddle.  

Note: There are many different seat clamps on the market, some with one bolt, others with two. If not sure how to remove saddle, consult a local bike shop.

6. Installing a saddle on BodyFloat™:

a. Place saddle upside down on a flat surface

b. Loosen the two 6mm seat clamp bolts until the ends are flush with the surface of their corresponding nuts. DO NOT remove nuts from binder bolts  

c. Invert the BodyFloat™ while holding the bottom clamp against the curved rear link, allowing the top clamp to hang from the clamp bolts, leaving space for the saddle rails.  

d. Align 2 wedge shaped bolt washers with skinny side facing outwards.

d. Lower BodyFloat™ in-between saddle rails, rotate 90 degrees and rest rails in top seat clamp rail grooves.  Rear link shooting star graphic aligns with rear of saddle.

e.Tighten clamp bolts making sure clamp nuts on top are fully seated in groove (adjustment of tilt and fore/aft comes after BodyFloat™ is on bike).

7. Installing BodyFloat™ on bike

a. Clean out seat tube on your bike frame with a clean rag (no solvents!)

b. Lube post section with a light film of grease; if you have an alloy post, use all purpose bike grease; If you have a carbon post, use a carbon specific lube such a Carbon Prep.

c. Remove all ‘pre-load’ from BodyFloat™ by turning the pre-load bolt counterclockwise until a tiny gap forms between the pre-load bolt and the pre-load insert, then tighten 1 or 2 clockwise turns. This is the highest possible position (no pre-load) on a BodyFloat™.

d. Insert post into frame and adjust saddle to slightly above desired saddle height (1-3cm)  

e. Tighten seatpost binder bolt to appropriate torque setting.

f.  Duplicate your previous measurements:  saddle tilt and fore/aft measurement from stem to saddle.  

g. Tighten saddle clamp bolts tightly, ride a few minutes and re-tighten. .



Adjusting BodyFloat™ to the rider


BodyFloat™ is adjusted based on three metrics: rider weight, riding style and terrain. The following instructions will show you how to make adjustments based on these metrics.

For best results, adjust BodyFloat™ while on a stationary trainer or leaning against a wall with an assistant helping.  The goal here is to first find the ‘relative height’ and second, to find the right pre-load to best fit the rider.

‘Relative height’ is the compression, or position while sitting, of BodyFloat™ under the body with the proper spring rate.  

‘Pre-Load is when body weight causes the unit to compress to a certain point under a certain riding position...this is your ‘Sweet Spot.”  For more detailed information on this important adjustment, go to    

1. Go for a short ride on existing seatpost/saddle:


a. Go out for a short ride (maybe around the block, or out and back 250m+ on a nearby street or path).  Pick a repeatable safe path that has the usual small bumps, features and nuances of the pathways/roads most commonly ridden.

b. Pay special attention to how the bike feels at all body contact point (feet, hands & butt) while pedaling.  Also consider bike performance while cornering, braking, accelerating and coasting.  

c. Repeat this same route as instructed below.

2. BodyFloat™ requires three metrics for adjustment: Weight, Riding Style and Terrain

a.  Weight - Measure and record your body weight.  Keep in mind that while riding, weight is distributed between your handlebars, pedals and saddle.  BodyFloat™ will accommodate a wide range of riding positions and body sizes.  

b. Riding Style - How much weight a rider actually puts on the saddle is based largely on what kind of riding style and output is desired.  Recreational, comfort upright, aggressive racing, time-trial, etc.  

ie: A road bike is typically  more aggressive with lower bars and a higher saddle height) and will result in a higher power output.  An aggressive position will reduce saddle pressure and increase power.  The same rider, on a commuter bike, may sit virtually straight up, maybe with a messenger bag or pack on, and rest the majority of the body directly on the saddle and desire more BodyFloat™ levitation.  These two positions may greatly alter the recommended spring-rate and pre-load adjustment for the same rider.  

c. Terrain - BodyFloat™ is engineered to handle a wide combination of high frequency/low amplitude impacts.  Smooth roads vs. chip seal, gravel paths vs. single track.  Determine how much travel is needed to isolate the rider from the usual terrain he/she rides.   

2. Finding ‘Relative Height’ on your BodyFloat™:

a. Confirm proper spring rate selection for your BodyFloat™ from chart.

b. With fore/aft and tilt set, sit on saddle in prefered riding position with hands on bars, feet on pedals.

b. Gently rise and sit repeatedly several times, finding ideal ‘neutral’ position.  Distribute weight as if simulating riding style on that bike.  This should compress the BodyFloat™ slightly down.  If no compression happens, a lighter spring rate is recommended.  

c. While seated in the neutral position, remain still and tighten the pre-load bolt until the saddle just starts to drop. This is your approximate neutral position as determined by weight, spring rate and riding style.  

d. Dismount bike and re-adjust seatpost height (by loosening frame binder bolt) up to original height measurement from old saddle.     

e. Go out for a spin on selected route as noted above and be attentive to how the bike and BodyFloat™ feel.

f. From here we recommend removing pre-load slightly until desired feel is attainted.  

g. For a more plush ride, remove pre-load by turning the pre-load bolt counterclockwise 1 turn at a time until desired levitation is attained.  Reducing pre-load does not change saddle height because rider will settle into the ‘neutral’ position when seated.  

h. For a more firm ride, add pre-load by turning the pre-load bolt clockwise 1/2 turn at a time.  If dropping below the neutral position, raise seat post in the frame to maintain proper saddle height.  

i.  Cirrus Cycles recommends taking several rides to dial in your prefered setting.  

Note: Pre-load desire may change markedly depending on the terrain, bike selection, riding style and other factors.  

9. General help notes on adjusting pre-load:




Less is more.  BodyFloat™ is not suspension built to launch over jumps and large hits.  BodyFloat™ is designed to isolate you from the inherent small bumps and vibrations of the road/trail surface.  Maximum isolation is achieved by finding the right combination spring rate, pre-load and riding style to match the terrain upon which your riding. Some may like more travel and plushness over the terrain, some less.  That’s the beauty of BodyFloat™...control it however you’d like!


BodyFloat™ is designed to do many things for a rider beyond isolating them from the terrain.  By allowing a controllable vertical compliance a rider can control his/her pedal induced bounce, helping smooth your pedal stroke efficiency.



a.) Chip seal: These are commonly roads paved with small gravel and oil.  This surface contains very small, very high frequency bumps that can rattle your brain.   Minimal travel (maybe >1/2”) with the lightest possible spring rate will produce the best results for most.   

b.) Gravel/Green Trails: Loose packed gravel or double-track.  This surface may contain larger gravel, small holes, bumps and features that are generally rideable on any bike.  Reduce pre-load a bit more on this to achieve desired feel yet reduce pedal induced bounce.  


a.) Comfort is a subjective metric and will vary greatly between riders and bikes.  

b.) If comfort is most important then try less pre-load above your neutral position.  This will achieve more levitation with more available travel. The bike will maintain more constant contact with your body through a broader range of terrain features.


Generally adjusted slightly above your neutral setting. Limit pedal induced bounce but still maximize comfort and performance benefits. 


Generally adjusted at or with slightly more pre-load than neutral position.


If carrying a messenger bag or sitting straight upright, more spring-rate may be desired.  

© Cirrus Cycles 2013