Prologo Proxim W650 Sport E-Bike T2.0 MSS Hard Black 250mmx155mm 235g PASPrologo Proxim W650 Sport Saddle T2. 0 Black 155 mm. The Prologo Proxim W650 Sport Saddle is more flexible allowing greater freedom of movement and facilitating each pedal stroke. With individual zones mapped and separated along the saddle each composed of different interactive foams and single cell padding. These areas work independently adapting to all the positions that cyclist can take. E bike specific but an all terrain and multicategory saddle