Dual-Position Seatpost
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Description
The patented Dual-Position Quick Adjust Aero Seatpost lets you ride a true aero position on a standard road bike, without sacrificing your normal road position. Along with the Quick-Release Aerobars it provides the benefits of a triathlon or time trial bike without the additional bike or price tag. The key to riding powerfully and comfortably is proper saddle position and since you can switch between road and aero positions on-the-fly while riding, you can always choose the best riding position for every part of your ride.
Benefits of Quick Adjust Dual Position Aero Seatpost
• Transform your current bike - switch from road to aero position on the bike you already own
• Ride with ease - no more time and energy wasted switching from road bike to aero bike
Details:
• Linkage design lets you switch between road and aero riding positions seamlessly.
• Choose the best seatpost position for every single climb, flat, or descent
• Maintain proper leg extension in both road and aero riding positions
• Saddle moves forward 50mm, corresponding to approximately 4 degrees of effective seat tube angle change
• Aero road riding position optimized for proper handling on a road bike
• Simple, durable two-bolt saddle clamp allows infinite saddle tilt adjustment and reliable clamping
• 16mm rearward setback (road position)
• Check technical specifications for compatibility
What's in the Box:
• 1 x Dual-Position Seatpost
Technical Specifications
Weight 400 g Seatpost Diameter (A) 27.2 mm Seatpost Length (B) 350 mm - (bottom to clamp centerline) Minimum Insertion (C) 75 mm Rearward Offset
Road Position (D)16 mm
(post centerline to clamp centerline)Forward Offset
Aero Position (E)34 mm
(post centerline to clamp centerline)Total Travel
Road to Aero Position50 mm
(3-4 degrees effective seat tube angle change)Saddle Rail Compatibility Standard 7 mm round saddle rails only Material Linkages & saddle clamps - 7075 T6 aluminum
Post - 6061 T6 aluminumRider Weight Limit 115 kg (250 lb) Intended Use ASTM F2043 Class 1 - Suitable for road riding (only). 
Instructions
Download Instructions (PDF):
Instructions - Dual-Position Seatpost
FAQ
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, clamps, or some other inflexible attachment method, it's possible that your bag may not be compatible.
Here is an example bikepacking saddle bag from one of our ambassadors that works just fine with the Dual-Position Seatpost:
If you have questions about your specific bag, please email us at info@redshiftsports.com and we'll help you figure it out!
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-legal events, which are relatively uncommon. If you're wondering about a specific race, shoot us an email at support@redshiftsports.com and we'll help you figure it out.
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 with a thin layer of packing foam is usually sufficient to secure the battery within the seatpost.
To read more Frequently Asked Questions, click here.
US Shipping Info
- Free Shipping with tracking – Applied to all orders under $74 USD.
- Economy Shipping with tracking – Orders over $74 USD qualify for free shipping.
- Economy Shipping with tracking – 1-3 business days after processing time.
- Orders ship via our third-party fulfillment service, that will select the most efficient carrier based on your location. Standard delivery typically takes 3-8 days, though in some cases, it may extend up to 15 days.
- Order processing time is 1-3 business days.
- If you order multiple items, they may be shipped from separate warehouses and may not arrive at the same time.
90 Day Risk-Free Trial & Returns
Free Returns Included
- 360° Ride Guarantee
We stand behind our products. If you're not satisfied with your Redshift purchase, we'll make it right. - 90 Day Risk-Free Trial
Products purchased via our website can be returned within 90 days for a full refund, no questions asked. Excludes scratch & dent items. We never charge restocking fees. - Free Shipping + Free Returns/Exchanges
On website orders $74 USD+, we ship for free to customers in the US. We also cover the cost of return shipping for customers in the US. Free returns/exchanges do not apply to scratch & dent items. - Lifetime Warranty
We stand by our engineering and build quality. If you receive a defective product, we'll repair, replace, or refund it. Arclight Pedals have a limited 1-year warranty. Scratch & dent items are covered under warranty but not eligible for free returns.
Different bikes sometimes have different seatpost diameters. The ShockStop Seatpost is 27.2mm in diameter, so if your bike's seatpost is larger, you'll need a shim to adapt our seatpost to your bike's frame. Don't worry though, the shims are super-lightweight and essentially invisible once installed.
Not sure what size seatpost you have currently? There are a couple different ways to find out.
• Most seatposts have the diameter printed somewhere near the bottom of the post. You'll need to remove the seatpost from the bike frame (mark your existing seatpost height with a bit of tape before you remove it so you can replace it easily), and look for a number like 27.2, 30.9, or 31.6 (etc.). That is the diameter of the post.• If you know the make, model, and year of your bike, you may be able to look up the seatpost diameter online. Feel free to shoot us an email at info@redshiftsports.com - we'll see if we can help out.
• Ask your local bike shop - they'll be able to accurately measure your bike's seatpost.
Non-compatible posts: Unfortunately, if your bike's seatpost is smaller than 27.2mm (for example, the 25.4mm posts found on some recent model Cannondale Synapses) our seatpost is currently not compatible with your bike. Likewise, if you have a bike with an aero/oval/non-round seatpost, or if your bike has an integrated seatmast, the seatpost is also not compatible.
Customize your position on the go. Maximum efficiency.
One Bike to Ride Aero or Standard
Change from a standard road saddle position to an optimized aero position on-the-fly while riding, and attach or remove the aerobars in a few seconds without any tools so you can choose the best setup for every ride.
Maximised Speed & Efficiency
Aero positioning translates into more power transfer and reduced fatigue, so you can go farther and faster with the same energy.
Optimised Fit & Control
Precision-engineered geometry ensures stability, comfort, and total control, whether you're racing, training, or riding long distances.
Redshift trusted by
200,000+
Vivian S.
We bought 2 sets one for my husband and one for me. They are comfortable to ride with and I cannot recommend them more highly. Love love love them
William c.
Rode today my new Quick-Release Clip-on Aerobars great relief on the back and hands.
Oleksandr S.
I chose this system to add resting positions for my hands during long-distance trips, as well as to use during long rides against the wind.
Gunther B.
It's really cool to combine two characters in one bike with just the two positions of the seatpost.
Reinhold S.
For me it’s not just performance, for me it’s more variety in position
Edward D.
The dual-position seatpost works really well and is extremely simple to use. Using it with aero bar extensions & the ability move the saddle slightly forward.
As seen in
Perfect For
Time Trials & Triathlons
Maximise speed with an optimised aero position.
High-Speed Road Cycling
Reduce wind resistance for faster, more efficient riding.
Competitive Racing
Gain every aerodynamic advantage when it matters most.
Fast-Paced Group Rides
Quickly remove your bars or flip your riding position when you need to.
- Reviews
- Questions
United States
Italy
United KingdomGamechanger set-up for triathlon
I fall into the category of a user with a decent road bike but didn't want to throw down more money on a triathlon-specific bike (nor did I have the space for another bike). The switch aero system solved my conundrum by giving me the option for an optimised road or triathlon position in a heartbeat. Plus, the quick-release aero bars are genius, and whilst you can buy cheaper / lighter ones, the time saved by not having to remove the whole set-up every time is game-changing. I particularly love this when I have removed my aero bars for a club road ride, but I want to put them back on quickly when I jump on my turbo for Zwift. I'll be adding an 80mm shockstop stem to my set-up to finish off my upgrades to smooth out the terrible UK roads when on the aero bars. Well done Redshift! Innovation at its finest.
United StatesQR Aerobars
These aerobars are great! I'm impressed with the engineering and how solid they feel when using them. The quick on and off will be good for switching back and forth between group and solo rides.
CanadaMore than just for aero gains
I have had this seat post for several months. I have found that moving the saddle forward and up is not only good for aero gains but also great for climbing steep grades as it keeps you more overtop of the bottom bracket. I also find having an occasional change in position great for long endurance rides.
United Statesquick release aero bars on cannondale T1 touring bike
excellent. I also purchased the 30mm risers you offer. I have a redshift 30% 80mm stem and the combination is very comfortable and allows use of the aero bars as an alternative rest position on flats and downhills to relieve stress on the hands and shoulders. This was purchased for touring and longer endurance rides. I moved my seat forward and I don't find the position shift to the aero bars uncomfortable. The top shelf handlebar might further enhance the comfort.
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