JK Exer Indoor Bike. JKs top 3985 model benefits full commercial grade quality and a cync fly wheel for superior spinning stability and performance. The drive is smoother with an advanced belt-drive & fixed gear system. It also has an emergency V-brake with tension controller. Seat adjustability is complete with 11 range height finder and micro adjustment handlebars.Strangely not as styled as its junior its performance is in a different class. Finished in Blue, Black & Chrome
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