Dual Position Seatpost
What saddle should I use to ride in the road and aero position?
Saddle choice is an extremely personal choice - what works well for one person may be terrible for another person based on differences in anatomy and riding style. Our suggestion is to find a good local bike shop that has a saddle demo program and...
Will the Dual-Position Seatpost fit my aero/non-round seatpost?
The Dual-Position Seatpost currently only fits standard round seatposts that are 27.2mm or larger in diameter. The reality is that every model of aero bike has a different shaped seatpost, meaning that it is impossible to create a post that will...
Will the Dual-Position Seatpost fit my Trek Madone/Domane/Emonda?
If your Trek has a standard type seatpost (male post fits into a female hole in the frame), then the dual-position seatpost will fit your bike. If your bike has a "Ride-tuned Seatmast" (commonly found on higher-end Madone/Domane/Emonda models)...
My bike has a 25.4mm seatpost. Will the Dual-Position Seatpost fit?
Currently, the Dual-Position Seatpost will only fit bikes that have seatpost diameters of 27.2mm or larger. We are always expanding our product line - please sign up for our newsletter to be notified of new product releases.
Will the Carbon Dual-Position Seatpost come back?
We had a small production run of carbon seatposts that we produced in 2015, but we weren't happy with the production process and associated costs. We do not currently have plans to produce a carbon version of the Dual-Position Seatpost again, but...
Is the Redshift Dual-Position Seatpost legal to use in a triathlon race?
Yes! The Dual-Position Seatpost is legal for use in any non-drafting triathlon. That includes all Ironman events, USAT sanctioned events, and the vast majority of triathlons worldwide. The only events where the seatpost is not permitted are draft-...
Is the quick-release mechanism secure?
Absolutely. We spent a huge amount of time refining the quick-release mechanism to make sure that it is rock-solid when the aerobars are attached. When tightened properly, the quick-release aerobars are indistinguishable from standard aerobars in...
How do I move from the road to aero position (and vice versa)?
Moving the Dual-Position Seatpost between positions is incredibly simple and can be done in a few seconds while riding. To move the saddle forward from road to aero position, simply unweight the saddle, grab the nose of the saddle between your...
Is there a lock or release button? What keeps the saddle in place?
The main thing that keeps the Dual-Position seatpost locked in either position is your body weight. In order to move between positions, the linkage has to move upward first, so as long as your weight is resting on the saddle, the linkage cannot...
Will the seatpost linkage move accidentally while I'm riding?
Nope! We spent a lot of time optimizing the linkage design to eliminate the possibility of unintended motions, while still making it easy to switch positions. Once you are accustomed to how much rearward pressure is required to move from aero to...
What size diameter is the Dual-Position Seatpost?
Currently, the Redshift Dual-Position Seatpost is only offered in one diameter (27.2mm). If your current seatpost is larger than 27.2mm (common sizes include 30.9 and 31.6mm), you'll need a shim to fit the seatpost properly in your frame. We sell...
How far does the seatpost move between road and aero positions?
The Dual-Position Seatpost moves 50mm between the road and aero positions. The linkage is designed as such that the bottom bracket to saddle distance remains the same, ensuring proper leg extension in both riding positions. As a result of this,...
What kind of testing do you do to qualify the Dual-Position Seatpost?
All Redshift Sports components are tested to the latest ISO 4210 standard for Racing Bicycles. These standards typically specify "Static Strength" tests (i.e. one-time application of force) as well as "Fatigue" tests (i.e. repeated application of...
Will the Dual-Position Seatpost fit a Shimano Di2 battery inside?
Yes, the standard "lipstick" style Shimano Di2 battery will fit inside the seatpost. Keep in mind that the inner diameter of the seatpost is ovalized, so standard round battery mounts may not be compatible. We have found that wrapping the battery...
What is the weight limit for the Dual-Position Seatpost?
The rider weight limit for the Dual-Position Seatpost is 115 kg (250 lb).
How do you ensure proper bike fit in both the road and aero positions?
The linkages geometry of the Dual-Position Seatpost was specifically designed to provide an optimized aero riding position on a road bike. Starting with your existing road saddle position, the linkage maintains the same bottom-bracket-to-saddle...
Will my saddle bag fit with the Dual-Position Seatpost?
Most standard strap-based saddle bags will fit the dual-position seatpost without issue. You may need to loosen the straps slightly to accommodate the movement that occurs between road and aero positions. If your saddle bag uses rigid clips,...
Why does the Dual-Position Seatpost need to move?
This is a really important question, and it's one that we've spent a lot of time thinking about here at Redshift Sports, so get ready for a long answer! Aerobars (of any brand) work by rotating your upper body forward so that it is more parallel...
What is the effective setback of the Dual-Position Seatpost?
In the road position (rearward position), the seatpost has 16mm of rearward setback. In the aero position (forward), the saddle clamp is offset 34mm forward of the seatpost centerline.
Will riding with a forward saddle position compromise my bike's handling?
We specifically designed the Dual-Position Seatpost to provide an optimized riding position on a road bike. If you're new to riding in an aero position, it may feel strange for a few rides, but you'll quickly get the hang of it. As with anything...
Can I adjust the saddle position independently in the road and aero positions?
The amount of forward travel of the seatpost is fixed at 50mm, so the two positions are not independently adjustable. For most riders, we recommend that they duplicate their existing road saddle position (assuming that you are happy with your road...
Does the Dual-Position Seatpost feel different than a regular seatpost?
Not really. When you're riding in either position, the seatpost is indistinguishable from a standard seatpost, however, the ability to change positions during a long ride makes a huge difference in comfort that you'll undoubtedly notice.
Will the pivots develop play over time?
No. We spent a lot of time designing and testing the pivots and linkages to ensure that they would remain rock solid throughout the life of the product. We specifically chose the material of the shaft and pivot bushings to provide outstanding...
Are the bolts interchangeable for the Dual-Position Seatpost Replacement Hardware Kit?
No, the front and rear bolt are different lengths to properly accommodate a full range of saddle tilt. The front bolt is 35mm long, while the rear bolt is 30mm long. It is important to use the correct bolt in the correct location to ensure that...
Will the Dual-Position Seatpost work with both “Aluminum” and “Carbon Rails”?
Yes. As far as carbon saddle rails are concerned, there is no reason that our clamp cannot be used but it is important to make sure that the saddle does not have some specification that requires only certain clamping systems. This is similar to...