Oh cool. I have a black tioga spyder on one of my fixed-gear freestyle bikes and I have 2 d-spyders. I like the Tioga seats despite so many people who hate them
I think most people who hate them have never sat on one and have always though they looked cool but I always though they would be uncomfortable untill I tried my mates one
I don't know on the rails on mine, they say hollow composite alloy so id assume that they are that (don't think they make 2 models of this, don't know what is on the d spyder). Comfy enough. I have 2 of them.