Even at first glance a time trial or TT saddle is very different from a road saddle. Flatter, shorter and with a much wider nose than the 'standard' models. These changes are not made for aesthetic reasons, but are determined by the type of position and effort associated with the TT bike.
Yeyo Corral, Sports Scientist-Pht, Cycling TT expert and consultant to the Astana Qazaqstan Team, explains what changes and tricks to take when choosing and positioning a TT saddle:
How to choose your saddle
Unlike the road bike, the time trial bike is characterised mainly by two important points to take into account.
The first is the position of maximum anterior flexion of the pelvis and trunk of the cyclist, which greatly limits muscular work and balance.
The second is the increased intensity with which the exercise is carried out, which greatly conditions the muscular work, causing the onset of fatigue to a much greater extent.
If we combine the intensity of the exercise and the muscular tension of the cyclist's position on the time trial bike, we have a very important limiting factor which directly influences the choice of saddle, both in its type and in its correct and optimal positioning. 
The cyclist's support on the saddle is very limited and reduced, since it occurs in the front part of the pelvis, particularly in the pubic area. Therefore, a specific saddle for optimal support must be wide enough at the front and comfortable enough not to cause any harm to the cyclist.
From the point of view of aerodynamic performance, stability and reduction of lateral movement is very important, so you need a saddle that offers this stability and ensures a good trajectory. In my opinion the Prologo Dimension Tri saddle offers all the features a cyclist needs to be well supported and allows maximum comfort.
Another technology used during the time trial is the CPC: a set of conical 3D polymers that create a vacuum effect to guarantee maximum stability and position.
How to position the saddle.
Once the most correct shape has been identified, with the front part wider and offering stability and comfort, it is necessary to set the product on the bike in an optimal way. In fact, the saddle alone, without the appropriate fitting, will not be sufficient to allow maximum performance of the alteta.
The shape of the wider tip and its slight inclination means that we do not have to position the saddle with a high degree of negative tilt, allowing us to ride comfortably in aerodynamic positions and to have good support if we have to change the position of the body in technical areas where more central and ischial support is required. That's why once again the design of the Dimension Tri is very interesting from a biomechanical point of view.
Another of the most relevant features of this saddle model is the freedom it gives the rider in his pedalling, avoiding the generation of friction on the inside of the leg, which is so often a nuisance for the rider.
If we draw a straight line between the backrest and the front of the seat, my recommendation is to work with negative degrees of tilt between 2* and 4.5°.
In the Prologo range there is not only the Dimension Tri, so popular with professionals and triathletes, but also the T-gale, for a very aggressive position, or the Zero TT, to meet everyone's needs. Here too, as with the Road and MTB saddles, we recommend our Fitting Myown system to find out which model is best suited to you.
