Our final production version of Tangent drive, raw on raw. The HV80 is mounted cleanly on the left side, using the width of our new 6mm thick mounting plates to easily clear the crank arm and frame tube. The thicker plates are lighter and allow the use of rubber motor mounts, seen in black between the housing and mount. A revised chainline moves the motor chain to the inner position, eliminating twist and flex. The 951 frame uses the medium length metal downtube strap and was easy to bend to this frame's triangle shape; three lengths of strap are included in the kit.