Vbestlife Bicycle Seatpost 27.2/28.6/30.8/31.6 x 450mm Aluminum Alloy MTB Road Mountain Bike Seat Post (Black)

Excelente poste/tija para la bici de montaña que tengo. Aunque no es mi talla, 45cm permiten dejar 15cm o mas dentro del cuadro de la bici. Comparado a los 30cm que tenía el anterior, que solo le dejaba unos 5cm dentro del cuadro de la bici.Entonces puedo montarla sin pensar en que afectare al cuadro. Claro usandola sin comprometer al mismo, no vaya ser que no soporte el aluminio ese esfuerzo de movimiento.

Excelente tija de sillín, ultra resistente. Ideal para bicicletas con marco bajo y usuarios por encima de los 90kg

One of the reasons for acquiring an extra-long seat post is to allow adequate seat height for a tall rider on a frame with a short seat tube, as some designs often have. This requires having a long section of the post that's above the frame, creating a lever effect creating substantial bending force on the post when the rider is perched on the saddle, and even more bending force when the bike hits a bump with the rider seated. Most seat posts are fairly beefy to account for the fact that this occurs - and the longer the post, the more that such a safety margin in strength is needed. This is a very long post at 450mm, but it's one of the thinnest I have encountered. I'll use it, because in this instance the rider of the bike is light, but I would not be OK fitting this post on a bike where the rider weighs 200+ and the seat post projection is more than about eight inches.

Full disclosure. I weigh ~250lbs. And I use on a hardtail.Post was bent after a handful of rides

Works well, is quite light and sturdy (I'm 240 and have it at its maximum extension)