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FWIW I saw a tandem yesterday with a steel seatpin with steel Ahead stem(approx 10cm) fitted to the top,with an old type bolt through saddle clamp fitted to that,believe it or not it looked very neat. Construction material plays a large part in comfort. Alloy, titanium and carbon are the three materials to choose from. A key factor is the diameter of the seat post. This must directly match the internal diameter of the seat tube of your frame. The majority of modern seat posts are 27.2mm, 30.9mm or 31.6mm wide, with the latter often described as oversized. At 300mm in length, the Enve seatpost is available in 0mm, and 25mm-offset versions. While quite a few carbon posts have a metal clamp head bonded on the top, the Enve post is carbon through and through. Skinnier seatposts are in vogue at the moment for the same reason skinny seatstays are popular: the theory is that they offer greater flex and therefore comfort.
Like handlebars, wheels, and nearly all other bike components, seatposts come in a variety of materials, the most common being aluminium and carbon fibre. As always, carbon commands a higher price tag, but it usually weighs less and can be constructed in a way that dampens more vibration while maintaining directional stiffness in a way that will benefit the rider. All seatposts clamp to the saddle in their own unique way, and have different methods of allowing the saddle to point slightly down, slightly up or remain flat.If you don't feel your bike needs to be any more comfortable, and you're not fussed about 100 grams, then aluminium seems like a smart choice. If you want to drop the weight or add some cushion, look to spend more. While the vast majority of standard seatposts are identical in form and function – being hollow aluminium or carbon tubes upon which the saddle is clamped – there are a few essential differences to know about when choosing or replacing a post. How much is the nose of the saddle behind the BB measured vertically with the bike on level ground? Leisure riders just need to make sure they’re buying a seat post with the correct diameter and in the correct length. If you’re in doubt, remove your existing seat post and have a look towards the end of the post and chances are it will have the diameter and length stamped on it. There are very few at the moment but some manufacturers have cradles which can only be used with their corresponding saddles. These will have a patented rail system which is unique to that manufacturer and cannot accept any other saddle.
Aero road bikes come with aero seatposts. These are flatter and designed to channel air more seamlessly, limiting the resistance that slows you down.Though some brands like to play exception to the rule, the majority of bikes are designed to fit a seatpost of either 31.6mm or 27.2mm. The same brand is also responsible for bringing dropper seatposts to the road audience: the Specialized Diverge, in its S-Works form, features a 'Command' dropper post. The theory is that those riding the adventure road bike, like mountain bikers, will want to be able to adjust their saddle height to suit the terrain. Some manufacturers produce a saddle with an oval shape rail which can only be used with corresponding seatpost. It looks round from a distance until you try and put it in a traditional saddle rail and tighten it… Colour
Most of the best road bike saddles use a two-rail system, however not all two-rail saddles are compatible with all seatposts. Saddles with alloy rails will have 7mm, round rails, while most carbon-railed saddles have 7x9mm oval rails.As is consistently the case, aluminium is perfectly adequate and will do the job. Carbon seatposts, however, offer greater dampening from road vibrations and are lighter. There are different lengths on offer, too. Seatposts will have a marker which shows the minimum amount of post that can be inside the seat tube. If you ride a small frame with a lot of seatpost showing, you'll need to make sure you buy a post that allows for this. Aero posts: While most posts (and seat tubes) are circular in cross-section, many manufacturers are now making aero posts for road and TT racing, with an elliptical ‘blade’ cross-section which offers improved aerodynamic performance by offering less frontal area to the wind. However in the case of ‘full’ aero seatposts you will require a frame with a matching seat tube, which limits the options when it comes to changing or upgrading. Some manufacturers get over this by offering posts with a shaft featuring a ‘normal’ bottom half, with the part above the seat clamp then shaped to a bladed aero profile. As with all aerodynamic upgrades in cycling, it is a culmination of marginal gains that will start to make noticeable differences to your riding. So, yes, seatposts can make a difference but, in most cases, aero seatposts will come in a proprietary design to fit a specific bike, making upgrade options considerably limited. Do carbon seatposts make a difference? Similarly, if you ride a very small frame size and intend to have the saddle quite low, make sure there's nothing obstructing a longer seatpost from slotting in. However, whilst you can always cut a seatpost that's too long, you can't add to the length if it's too short.
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