You are looking at the Precor C846i Uprght Exercise Bike. This precor uprights' magnetic, no-contact 3-phase generator system provides a wide range of resistance. 25 different resistance settings let users maximize workouts. Resistance levels range from 18 watts (level 1 at 20 RPM) to 500 watts (level 25 at 100 RPM) and 750 watts (level 25 at 150 RPM). This precor experience series has a 3-piece crank tightens positively, reducing the need for periodic adjustments. The 9/16" crank arm accepts any standard road or mountain bike pedal. The double step up drive system yields smooth, comfortable, quiet operation. The 846i Upright Bike has a 3-phase generator/eddy current resistance system which requires no backup battery in order to power the bike. Its Belt drive provides for smoother, quieter operation and reduced maintenance.