Couple that with our penchant for seeking rough roads, and seatposts really are the key to unlocking all-day comfort on your bike. Bikes fitted with narrower tyres have the most comfort to gain from using a flex seatpost. This is because a larger proportion of the overall shock and impacts will need to be taken up by the seatpost. Bikes with wider tyres still have a lot to gain too, as flex posts help to take the edge off bigger impacts.
You can learn about the relationship between seatpost and tyre comfort by reading about the springs in a series HERE. Over the last decade, bike manufacturers have been optimising their bikes around comfort, and the seat tube has been the main focus.
Giant created a unique seatpost shape called D-Fuse which will flex around 12mm underneath you. And Cannondale has stuck with something a bit more traditional, using a smaller-than-usual seatpost diameter paired with a flat-section carbon layup to achieve a super comfortable ride. A handful of aftermarket seatposts can match the vertical flex and vibration damping of the Trek, Giant and Cannondale designs, allowing you to transform whatever you ride into something that rides ultra smooth.
Carbon, Aluminium and Titanium Seatposts Seatposts are manufactured using three different construction materials. The majority are made from aluminium which is lightweight, reliable and very cheap to manufacture. Titanium seatposts are much less common and are typically paired with titanium frames for a nice aesthetic. Carbon seatposts are lighter and more expensive, but more importantly, they can be optimized using different layering techniques to achieve an unparalleled ride quality.
Suspension Seatposts There is a handful of suspension seatpost manufacturers, but perhaps the most common is Cane Creek. The advantage of a suspension seatpost is that it will help absorb big hits and other impacts from the ground below, allowing you to pedal through bumps while also reducing the fatigue on your body. Suspension seatposts have been measured to be multiple times more effective than any rigid seatpost.
The main disadvantage is the increase in weight. Elastomer Seatposts Specialized has been incorporating elastomers into their flex seatposts for over a decade so that they can achieve their desired ride characteristics. The latest-generation carbon elastomer post pictured on the right is said to offer 18mm of vertical flex, is reasonably lightweight and is also reliable as there are no moving parts.
Straight and Setback Seatposts Seatposts are available in different offsets ranging from 0 degrees to 35 degrees. A setback post puts you further behind your crankset and a straight seatpost moves you closer. The amount of setback or offset is best determined through a basic bike fit at a participating bike shop.
A seatpost that dampens vibrations effectively will insulate a rider from much of the road buzz coming up through their bike. Seatposts with the best damping characteristics have been tested to be more than twice as effective than those which perform poorly. There is a caveat here! This data only applies to bikes without luggage fitted.
A seatpost with more deflection will reduce the fatigue on your body as it protects you from harder jolts like unexpected potholes or dirt road corrugations. When testing seatpost deflection, two axes of measurement are usually taken — vertical and horizontal — but they almost always track proportionately.
The Velo Magazine lab test data shows that under the specific force applied, some seatposts were able to deflect twice as much as others. The results are a bit hard to read, so let me type that out: 1. Post by tomikasa on Sat Dec 31, pm.
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This will automatically being checked at www. If there does not appear a WW discount position when you check out you do not have enough postings! Weight Weenies Forum Skip to content. Quick links. Forum rules. Post by 34tony on Sat Dec 31, pm Anyone have a view of seatpost setback as it impacts ride quality.
I currently have a seatpost with a 2. The slacker and longer geometry of MTB's means that having zero offset puts the rider in the middle of the bike, rather then well behind the centre of the bike.
Having more weight forward helped prevent you from toppling back on steep climbs and allowed you to move your butt behind the seat post on the steep descent. So MTB's tend to come with zero set back posts as standard. Zero set back posts also work if you have a short femur. The zero offset helps to put those folks over the pedal easier.
Zero offset posts also work well if the top tube real or virtual is longer then ideal. Moving the seat forward reduces the distance between the stem and the saddle. If you've got a theory about the relationship between setback, position, fit, and performance, let us know in the comments. Posted by VeloOrange at PM. I always assumed "medium" setback came from the old timey literal seat posts that have the guts clamped on the top and saddle clamped to the guts. All other accommodations for geometry were based off of that legacy until more recently when seatpost sizing became more consistent and frame manufacturers started including a seatpost with their bike as an engineered package.
Spiva's comment about seatpost setbacks being a legacy of the old style straight seatpost hardware design is probably spot on. Old fashioned frames were designed around the geometry dictated by the common and inexpensive seatpost mechanical design.
I would also add that if one looks at photos of very old track style bikes they tended to have more relaxed frame angles, and the riders tended to place their saddles a bit further forward. Many times the straight seatpost clamp hardware was placed in FRONT of the post to allow the rider to get the saddle into the right spot. Wheelbases got shorter over time to sharpen handling, and seat tube angles got more steep to allow for shorter chainstays without clearance issues between seat tube and rear tire.
The setback style forged seatpost made it easier for the rider to get to the same position relative to the pedals in a steeper-angled frame. Average angles, average setback, average length saddle rails all combine to give an average range of rider positions. It has been an evolution over time based on where most riders prefer to sit. All other things being equal, a slacker seat tube angle and a short setback post will get you into the exact same place.
This leaves unanswered the question of why have setback in the first place, rather than simply change the angle of the seat tube to put the clamp in the correct spot. Once upon a time it was more of a practical matter of the design of the seat clamp. The clamp had an offset, so seat tubes were angled forward to compensate. But this feature still persists. But, having the option to change offset is good, now that we more often fit the bike to our bodies rather than contort our bodies to the machine as it comes.
Guessing which saddle and seat combination you need for a given fit can be a guessing game. Maybe some sort of chart.
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