With the EVO Rail Ultra, the developers at Sixpack have completely rethought the saddle construction. The focus is on a one-piece construction made of fibre-reinforced polyamide, in which the saddle shell and rail system are fused together. This so-called one-piece design is intended to save weight and at the same time distribute the forces more evenly in the material.
Compared to conventional saddles, where the rails and shell are constructed separately, this results in a clearly different flex character: specifically tuned without compromising stability. At the same time, the dimensions remain compatible with standard seat posts - the integrated rail system (7 × 10 mm) fits into standard saddle clamps.
E-TPU instead of classic foam
Sixpack has also gone its own way with the padding. Expanded TPU (E-TPU) is used instead of PU foam. The material is designed to distribute pressure peaks better and is also less sensitive to temperature. The surface remains deliberately structured. The aim is to provide additional support in the saddle - especially in technical passages or when changing riding positions. The setup is complemented by a central relief channel, which is intended to improve pressure distribution for different riding positions.
Rethinking assembly
The mounting system is striking: the EVO Rail Ultra is inserted into the seatpost from behind. The clamp does not have to be completely removed. Adjust the position, fix it, done.
In everyday use, this should be of particular interest when frequently changing the setup - for example when testing different positions or when using several bikes.
Mounting points for accessories
Sixpack integrates an M5 mounting point under the shell. This allows accessories such as saddlebag holders to be attached directly to the saddle. A solution that is minimalist and is intended to replace classic Velcro or rail systems.
Wide range of use from gravel to downhill
The range of applications is remarkable. Sixpack has positioned the EVO Rail Ultra not only in the trail and enduro segment, but also in gravity and gravel use.
While the focus is on weight and damping on long tours, the compact shape and grippy surface are intended to provide control for gravity use. The saddle is deliberately kept short and should not get in the way even on steep descents.
Sixpack EVO Rail Ultra - Info & Price
- Field of applicationTrail, Enduro, Downhill, All Mountain, E-MTB, Gravel
- ConstructionOne-piece shell with integrated rail system
- Saddle clamp7 × 10 mm (compatible with standard top clamps)
- UpholsteryE-TPU
- Widths140 mm / 160 mm
- Length: 246 mm
- Weightapprox. 148 g (140 mm) / 150 g (160 mm)
- Special featuresintegrated M5 fixing point
- Price: 129,95 Euro
Conclusion of the editorial team
The Sixpack EVO Rail Ultra is out of the ordinary. Instead of optimising details, Sixpack has opted for a fundamentally new design principle. The integrated rail system and the reduced design are particularly striking. The simplified assembly could be a plus point compared to conventional saddle racks.
The combination of very low weight and comparatively generous padding is exciting - a conflict of objectives that has so far caused many saddles to fail. The trail test will show whether the concept lives up to its promise in practice.
Our colleague Sandra Schuberth expresses concerns, but this only applies to bikepacking tours with classic saddlebags or arse rockets. If that's exactly what you're planning, you won't find a friend with this saddle and will have to resort to a saddle with classic saddle rails.
Stefan Frey
Editor
