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esto sería?

[ATTACH=full]17634[/ATTACH]

http://www.bikeradar.com/gallery/article/trek-76fx-review-20611/3

Del artículo: "There's a few millimetres of squish visible when you sit on the bike, but the main purpose is to screen out fatiguing vibration in the 40-50Hz range, which Trek reckon is the most obvious to riders."

obviamente no es adecuado para bajar el cerro...