Kettler cycle speed 5 exercise bike the kettler cycle speed 5 exercise bike is equipped with an 18kg 397lbs flywheel that ensures quiet operation and a brake shoe system that features an emergency brake function to provide versatile workouts the cycle has an infinitely adjustable resistance system whereas enhanced comfort while training is guaranteed by a sporty multi position handlebar and a seat that can be adjusted both vertically and horizontally the kettler speed 5 also comes wit