The Swiss Mountain Drive crank is about $900 on its own ,, 2 speeds 1:1 / 2.5:1, are like a 50t and a 20t Low..
torque transfer is a solid strut with a strap (lots of torque needed, to climb hills )
the Speed drive would be 1:1 Low , high is 1.65x that .. so a 34t acts like a 54t.
the current ones can take a Fixed load. there is a grip washer on the speed drive for torque on the BB shell edges. ..
Offer $2500 and see if they accept it..
Last edited by fietsbob; 12-15-14 at 10:58 AM.