In its day, possibly the premiere Ergometer/trainer in the world. 55 lb flywheel. Accurate Watts from 5-2000. Totally adjustable position. Works with Racermate software, erg video, and with the addition of an ANT+ adapter program, Zwift. Have also used it with Peloton with the addition of a BT cadence monitor and a BT HR monitor. Bought in 2011 for $8000. Now selling for $1000. Two riders only, light to medium use. Like new condition. See https://www.sram.com/...rq/products/velotron for further details; it has not changed. I’m happy to answer any questions. Located in Richmond, Virginia.