Tacx Roller Galaxia 2016 Conical rollers are tapered inward, keeping wheels centered for optimal stability Patented swing system rocks back and forth, absorbing acceleration and deceleration Convenient foldable design (31.5 x 19.7 x 5.31 when folded) -Maximum footprint of 53 by 19.7 Front roller spins equally for extra stability and speed tracking No power required, maintenance free