Here is another bicycle roller that lets you train harder indoors. The Tacx Galaxia is a retractable bicycle roller designed with conical rollers tapered inward to give you a stable ride. It doesn’t need a separate power source to work. It has a swing system to absorb forward and backward acceleration.
This bicycle roller trainer weighs only 8.2kg. It measures
31.5″ x 19.7″ x 5.3″ when folded and has a max footprint of 53 x 19.7″.