The Pro Form 390 SPX indoor cycle has an 18kg (39.6lbs) flywheel for silky-smooth operation & offers an efficient chain driven drive system with an emergency brake lever. This sleek machine features a manually adjustable multi-level resistance & is fitted with a big screen with an LCD display delivering constant feedback on the crucial workout data. The 390 SPX enables you to measure heart rate with a wireless receiver & an optional chest belt & provides a comfortable, natural position thanks to the adjustable seat with padding & adjustable, multi-grip handlebars.