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LifeSpan S4 Features: -Indoor Trainer Bike. -Material: Steel, leather, Poly-V. -Solid, reliable indoor cycling bike provides excellent performance for even the most intense bike rides. -Commercial quality components and construction provide long - lasting durability. -Fully adjustable seat and handlebars allow perfect sizing for proper riding position. -Leather resistance knob is easy to use as you simulate climbing hills and riding through valleys. -Use our seat and pedals or interchange with your own. -Backed by a commercial warranty. -For a perfect fit and comfortable ride. -Both the seat and handlebars adjust up, down, forward and backward in any combination. -Raise and extend the handlebars, lower the seat or minimize the distance between the seat and handlebars to get a precise fit that will result in an injury - free, effective workout. -44 lb Balanced flywheel and heavy-gauge, steel frame on the S4 indoor cycling bike provides superior performance for intense riding.