Outdoors & Fitness
The Best Suspension Seatposts: 4 Compared (and One to Skip)
Three of these four publish 35mm of travel, so travel is not the spec that separates them. Rider weight limits and what actually ships in the box are.
The short version
The Redshift ShockStop Endurance is the pick for most riders: 35mm of travel from a parallelogram linkage that stays active while you pedal, four lengths from 280 to 450mm, and a published rider limit that changes with diameter, 242 lb on 27.2mm and 264 lb on 30.9 and 31.6mm. The Kinekt XR Aluminum is the one to buy if you are heavy, carrying cargo or riding an e-bike, because Cirrus Cycles states a full 80 to 320 lb window and ships all five springs in the box with a preload knob you can reach while riding. The PNW Coast suits a narrower buyer: 40mm of air suspension plus 100 or 120mm of dropper travel, tuned with a shock pump, which means no springs to buy and nothing to guess. Skip the Cane Creek eeSilk+ for most people, because it is the lightest post here at a stated 323 grams and also has the lowest ceiling at 250 lb, and it ships with only the #5 elastomer covering 150 to 210 lb while the other four are separate purchases. Three of the four publish the same 35mm of travel, so buy on the weight spec. Best for: riders who want to know the spring is right before the post arrives.
Our picks at a glance
- Redshift Sports ShockStop Endurance Suspension Seatpost - Buy. A parallelogram linkage post with 35mm of travel that stays active while you are seated and pedalling, sold in more lengths and diameters than anything else here.
- Cirrus Cycles Kinekt XR Aluminum Suspension Seatpost - Buy. The only post here that states a full rider weight window rather than a ceiling, and it arrives with every spring you might need already in the box.
- PNW Components Coast Suspension Dropper Post - It depends. An air-sprung post that also drops, so it is tuned with a shock pump instead of a spring order, at the cost of being the heaviest and most complex thing here.
- Cane Creek eeSilk+ - Skip. The lightest tunable post here and the one with the lowest rider ceiling, shipped with a single elastomer that covers a 60 lb band in the middle of the range.
The verdict in 30 seconds
What mattered most
- Stated suspension travel
- Spring medium
- What ships in the box
- Published rider weight
- Diameters
- Lengths
A suspension seatpost is a spring with a saddle on top, and a spring only works if it is matched to the weight sitting on it. That makes rider weight the defining specification in this category, and it is handled very differently from page to page. One brand states a window in pounds. One states a ceiling. One publishes a pressure chart. One prints a range that contradicts itself. We read all four spec sheets and compared what they promise against what comes in the box.
A parallelogram linkage post with 35mm of travel that stays active while you are seated and pedalling, sold in more lengths and diameters than anything else here.
Best for: Gravel, endurance road and commuting riders who want a post that keeps working under power and comes in a size that fits.
- Redshift states 35mm of suspension travel and a 7mm rearward offset, rising to 12mm at a quarter of travel.
- Four lengths, 280, 350, 400 and 450mm, across 27.2, 30.4, 30.9 and 31.6mm diameters.
- Two springs ship in the box, one installed and a stiffer one spare, so most riders are covered on arrival.
- Rider weight limits are published per diameter: 110kg or 242 lb on 27.2 and 30.4mm, 120kg or 264 lb on 30.9 and 31.6mm.
- Preload is user adjustable and Redshift states that adjusting it does not reduce travel.
- Heaviest of the non-dropper posts here, from a stated 497 grams at 280mm to 732 grams at 450mm.
- The linkage is visible and mechanical looking, which not everyone wants on a road bike.
- The rider limit is lowest on 27.2mm, the diameter most road and gravel frames use.
- Di2 battery compatibility applies to the 27.2mm by 350mm size, so check before assuming.
The only post here that states a full rider weight window rather than a ceiling, and it arrives with every spring you might need already in the box.
Best for: Heavier riders, cargo and e-bike riders, and anyone who would rather the correct spring arrived with the post.
- Cirrus states a rider window of 80 to 320 lb, or 36 to 145kg, which is the widest published here.
- Five springs supplied: two installed and three more in the box, so no follow-up purchase.
- A preload adjuster knob you can turn by hand, including mid-ride.
- Stated travel range of 0 to 35mm and a 24mm setback, with 6061 aluminium, stainless hardware and Igus bushings.
- Four diameters, 27.2, 30.9, 31.6 and 34.9mm, which covers e-bike and cargo frames others skip.
- Weight is not published on the product page, and the dual-spring linkage is not a light design.
- Only two lengths, 350 and 420mm.
- The linkage is tall and bulky, so it needs seatpost height to work with.
- The sister LR model covers 80 to 180 lb, so picking the wrong one of the pair wastes the range.
An air-sprung post that also drops, so it is tuned with a shock pump instead of a spring order, at the cost of being the heaviest and most complex thing here.
Best for: Trekking, commuting and gravel riders who genuinely want a dropper as well as suspension and will keep a shock pump around.
- 40mm of tunable air suspension on top of 100mm of dropper travel at 27.2mm, or 120mm at 30.9 and 31.6mm.
- Air means no springs or elastomers to buy, since PNW publishes recommended pressures by rider weight.
- The published pressure chart runs from 110 lb up to 275 lb, so tuning covers a wide range of riders.
- Internal and external cable routing options, and a PNW lifetime warranty.
- Heaviest here, at a stated 596 grams for 27.2 and 30.9mm and 610 grams for 31.6mm.
- A dual chamber hydraulic cartridge is more to go wrong than a coil or an elastomer.
- The 27.2mm version gets only 100mm of drop against 120mm on the larger diameters.
- You need a shock pump to set it up, and it will need pressure checks the others do not.
The lightest tunable post here and the one with the lowest rider ceiling, shipped with a single elastomer that covers a 60 lb band in the middle of the range.
Best for: Light road riders near the middle of the weight chart who want the lowest weight penalty and will happily order the right elastomer.
- Lightest here by a clear margin, at a stated 323 grams for the carbon 27.2mm version.
- 35mm of travel, the same figure Redshift and Cirrus publish, from a simple elastomer spring with no pedal bob claimed.
- Five elastomer grades exist, so the post can be tuned across a wide weight range.
- Cane Creek publishes full geometry: 12mm offset, 80mm minimum and 287mm maximum extension.
- Stated maximum rider weight of 250 lb, the lowest of the four.
- Only the #5 elastomer, covering 150 to 210 lb, ships installed, and the other four grades are sold separately.
- The published weight chart lists 200 to 250 lb against both the #7 and the #9 elastomer, so the top of the range is ambiguous on the page.
- Two diameters only, 27.2 and 31.6mm, and a single length per material.
| Criteria | ShockStop Endurance Suspension Seatpost | Kinekt XR Aluminum Suspension Seatpost | Coast Suspension Dropper Post | eeSilk+ |
|---|---|---|---|---|
| Verdict | Buy it | Buy it | It depends | Skip it |
| Best for | Gravel, endurance road and commuting riders who want a post that keeps working under power and comes in a size that fits. | Heavier riders, cargo and e-bike riders, and anyone who would rather the correct spring arrived with the post. | Trekking, commuting and gravel riders who genuinely want a dropper as well as suspension and will keep a shock pump around. | Light road riders near the middle of the weight chart who want the lowest weight penalty and will happily order the right elastomer. |
| Price tier | $$ · mid-range | $$$ · premium | $$$ · premium | $$$ · premium |
| Stated suspension travel | 35mm | 0 to 35mm | 40mm of air, plus 100 or 120mm of drop | 35mm |
| Spring medium | Swappable spring, material not stated | Urethane elastomer, five supplied | Air, set with a shock pump | Elastomer, five grades |
| What ships in the box | Two springs, one installed | Five springs, two installed | Nothing to add, pump to pressure | One elastomer, the #5 |
| Published rider weight | 242 lb on 27.2 and 30.4mm; 264 lb on 30.9 and 31.6mm | 80 to 320 lb window | Pressure chart from 110 to 275 lb | 250 lb maximum |
| Diameters | 27.2, 30.4, 30.9, 31.6mm | 27.2, 30.9, 31.6, 34.9mm | 27.2, 30.9, 31.6mm | 27.2, 31.6mm |
| Lengths | 280, 350, 400, 450mm | 350, 420mm | 380mm at 27.2; 400mm at 30.9 and 31.6 | 387mm alloy; 362mm carbon |
| Stated weight | 497g at 280mm up to 732g at 450mm | Not published | 596g at 27.2 and 30.9mm; 610g at 31.6mm | 323g carbon 27.2 up to 378g alloy 31.6 |
| Setback | 7mm, rising to 12mm at a quarter of travel | 24mm | Not published | 12mm |
| Dropper function | No | No | Yes | No |
Which one is right for you?
- Gravel, endurance road and commuting riders who want a post that keeps working under power and comes in a size that fits. Buy it Redshift Sports ShockStop Endurance Suspension Seatpost
- Heavier riders, cargo and e-bike riders, and anyone who would rather the correct spring arrived with the post. Buy it Cirrus Cycles Kinekt XR Aluminum Suspension Seatpost
- Trekking, commuting and gravel riders who genuinely want a dropper as well as suspension and will keep a shock pump around. It depends PNW Components Coast Suspension Dropper Post
- Light road riders near the middle of the weight chart who want the lowest weight penalty and will happily order the right elastomer. Skip it Cane Creek eeSilk+
How we judged the field
Five things decide a suspension seatpost, and the first one is not travel. It is whether the spring matches your weight, because a post sprung too firm never moves and a post sprung too soft sits at the bottom of its stroke and stops being suspension. The second is what the spring is made of, since a coil, a polymer elastomer and an air chamber behave differently and are adjusted in completely different ways. The third is whether the suspension stays active while you are seated and pedalling, which is the state most riders are in when the road gets rough. The fourth is fit: diameter, length, minimum insertion and setback all decide whether the post can go in your frame and put the saddle where you need it. The fifth is weight, which is the price of all the above.
We picked four posts that answer the spring question in four different ways, and the comparison turned out to be simpler than expected because three of them publish exactly the same travel figure. Redshift states 35mm, Cane Creek states 35mm, and Cirrus states a range of 0 to 35mm. PNW is the outlier with 40mm of air travel, and it also adds a dropper. With travel effectively equal, the differences that remain are the rider weight specification and what is actually in the box, which is where the field separates sharply. One brand ships every spring you could need, one ships two, one ships one out of five, and one ships none because you supply pressure instead.
Redshift Sports ShockStop Endurance Suspension Seatpost - buy
The ShockStop Endurance is the post we would fit to most bikes, and it wins on breadth rather than on any single number. Redshift states 35mm of travel, the same as the lighter posts here, from a parallelogram linkage whose stated purpose is to keep the suspension active while you are seated and pedalling. That matters, because seated and pedalling is exactly when you meet broken tarmac. The fit range is the real argument: four lengths from 280 to 450mm across four diameters, which is more combinations than anything else here offers, and a stated 7mm rearward offset that grows to 12mm once the post is a quarter into its travel. Two springs come in the box, one fitted and a stiffer one spare, so most riders can set it up on arrival. The costs are weight and looks: a stated 497 grams at 280mm rising to 732 grams at 450mm, and a visible mechanism. Note also that the published rider limit is 242 lb on 27.2mm and 264 lb on the wider diameters, so the narrower frames get the lower ceiling.
Cirrus Cycles Kinekt XR Aluminum Suspension Seatpost - buy
The Kinekt XR is the post to buy when your weight, your luggage or your motor puts you near the top of the scale. Cirrus Cycles states a rider window of 80 to 320 lb, which is the only genuine window here rather than a ceiling, and the post arrives with five springs, two installed and three more in the box. That single packaging decision removes the most common frustration in this category, which is discovering that the spring you need is a separate order. Published specs cover a travel range of 0 to 35mm, a 24mm setback, 6061 aluminium with stainless hardware and Igus bushings, and four diameters including 34.9mm for cargo and e-bike frames that the others ignore. The preload knob is designed to be turned by hand while riding, which is how you find your setting in practice. What you give up is weight, which Cirrus does not publish and which a dual-spring linkage does not make light, plus length choice, since only 350 and 420mm are offered. If you are under 180 lb, buy the LR version of the same post instead.
PNW Components Coast Suspension Dropper Post - it depends
The Coast is the interesting one and the one with the narrowest correct buyer. It replaces the spring question with a pressure question: 40mm of tunable air suspension, set with a shock pump against PNW’s published chart, which runs from 200 to 230 psi for a 110 to 165 lb rider up to 260 to 300 psi for 240 to 275 lb. Nothing to order, nothing to guess, and you can re-tune it when you load the bike. On top of that it is a dropper, giving 100mm of drop at 27.2mm or 120mm at the larger diameters, with internal or external routing and a lifetime warranty. The costs are consistent with all that capability. It is the heaviest post here at a stated 596 grams for the two smaller diameters and 610 grams for 31.6mm, it contains a dual chamber hydraulic cartridge, and the 27.2mm version is short-changed on drop. Buy it if you actually want a dropper. If you do not, you are carrying a lot of mechanism for 5mm more travel.
Cane Creek eeSilk+ - skip
The eeSilk+ is a genuinely impressive post that we would not recommend to most buyers, and the reason is what happens between ordering and riding. It is the lightest thing here, at a stated 323 grams for the carbon 27.2mm version, with the same 35mm of travel as the Redshift and a simple elastomer spring that Cane Creek says produces no pedal bob. The geometry is fully published: 12mm offset, 80mm minimum extension, 287mm maximum. Then you read the spring provisioning. Five elastomer grades exist, but only the #5, covering 150 to 210 lb, ships installed, and the other four are sold separately. A 130 lb rider and a 230 lb rider both receive a post sprung for somebody else. The published chart also lists 200 to 250 lb twice, against the #7 and the #9, so the top of the range is unclear on the page itself. Add the lowest rider ceiling here at 250 lb and the case narrows to light riders who land in the middle band.
Redshift Sports ShockStop Endurance Suspension Seatpost vs Cirrus Cycles Kinekt XR Aluminum Suspension Seatpost: which should you buy?
The ShockStop Endurance and the Kinekt XR are the two to choose between, and the deciding question is where you sit on the weight scale. Both give you essentially the same travel. Redshift publishes a ceiling that depends on diameter, 242 lb on 27.2mm and 264 lb on 30.9 and 31.6mm, which covers most riders but puts anyone heavy on a road or gravel frame close to the limit. Cirrus publishes a window of 80 to 320 lb on the XR and ships all five springs, which is the answer if you are heavy, carrying panniers, or riding an e-bike where your effective load is higher than your body weight.
If weight is not the constraint, the choice comes down to fit and refinement. Redshift offers four lengths and four diameters, so it is far more likely to exist in the size your frame needs, and its 280mm option suits small frames where a 350mm post will not insert far enough. Cirrus offers only 350 and 420mm, but adds a hand-turnable preload knob and a 24mm setback that suits riders who want the saddle further back. Redshift is also the lighter of the two in practice. Pick Cirrus for the weight window and the springs in the box. Pick Redshift for the size range and to save some grams.
What to look for
- Find the rider weight spec first: it is the number that decides whether the post works for you, and it appears as a window, a ceiling or a pressure chart depending on the brand.
- Check the limit against your diameter: Redshift publishes 242 lb for 27.2 and 30.4mm and 264 lb for 30.9 and 31.6mm, so the frame you own changes the answer.
- Count the springs in the box: Cirrus supplies five, Redshift two, Cane Creek one out of five, and an air post none, which decides whether you can ride the day it arrives.
- Ignore small travel differences: three of these four publish 35mm, so travel is not where the real differences between them live.
- Check minimum insertion and length before buying: a long suspension post on a small frame may not insert far enough, which is why a 280mm option matters.
- Add your load, not just your body weight: panniers, a child seat or an e-bike battery all push you up the chart, and the spring only knows total weight.
Our final take
This is a category where the important spec is easy to find and easy to skip. Every one of these posts is a spring carrying a person, and three of the four move the same 35mm, so the decision is about matching the spring and about what turns up in the box. The Redshift ShockStop Endurance is the sensible default because it exists in the size your frame takes and arrives with a spare spring. The Kinekt XR is the right call the moment your weight or your luggage approaches the top of the scale, since it publishes the widest window and includes every spring. The PNW Coast earns its complexity only if you want the dropper. And a post that ships one elastomer out of five is asking you to place a second order before it can do its job.
Questions, answered
If three of these have 35mm of travel, what actually separates them?
The spring and who it is meant to carry. Travel is how far the post can move; the spring decides whether it moves at all under your weight and whether it runs out of movement over a pothole. Redshift publishes limits of 242 lb on the narrow diameters and 264 lb on the wide ones. Cirrus publishes a window of 80 to 320 lb. Cane Creek publishes a 250 lb maximum. PNW sidesteps the question with air and a pressure chart. Those differences will change your ride far more than a five millimetre difference in stated travel would.
Why does the Redshift rider limit change with diameter?
Because a 27.2mm post has a thinner tube than a 31.6mm one, so it is the shaft rather than the spring that sets the ceiling. Redshift states 110kg, or 242 lb, for the 27.2 and 30.4mm versions and 120kg, or 264 lb, for the 30.9 and 31.6mm versions. This matters more than it sounds, because 27.2mm is the diameter most road and gravel frames use, so the riders most likely to want an endurance post are also the ones getting the lower limit. If you are near the number, check which diameter your frame takes before you decide.
Does a suspension seatpost stop working when I pedal hard?
Some designs stiffen up under power because the pedalling load acts along the same line as the suspension. Redshift's argument for the parallelogram layout is specifically that the suspension stays active while you are seated and pedalling. Cane Creek makes a related claim for the eeSilk+, describing no pedal bob and a consistent saddle height. Either way, a post that moves 35mm on a test bench and nothing at all while you are putting down power has not helped you. If you ride seated on rough surfaces, that behaviour is worth more than the travel figure.
Is an air post better than springs or elastomers?
It is more adjustable and more maintenance. The PNW Coast is tuned with a shock pump against a published chart, which means you are never waiting on a spring order and you can change the setting as your loaded weight changes. The costs are that it is the heaviest post here at a stated 596 grams, it uses a dual chamber hydraulic cartridge with more inside it than a coil or a polymer block, and you will be checking pressure periodically. If you want to set a post up once and forget it, a coil is the simpler answer.
Will a suspension seatpost fix the same problem as a better saddle?
No, and they are worth separating. A saddle decides where your weight sits and whether your sit bones are supported. A suspension post decides how much of the road surface reaches you. If you ache after an hour on smooth tarmac, that is a saddle fit question. If smooth roads are fine and broken surfaces batter you, that is what a post addresses. Fixing them in the wrong order tends to mean buying twice, so measure your sit bones and settle the saddle first.
Deciding between the top two? See our head-to-head: Redshift Sports ShockStop Endurance Suspension Seatpost vs Cirrus Cycles Kinekt XR Aluminum Suspension Seatpost.
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