Ignaz & Frank Schwinn Marin Museum Of Bicycling And Mountain Bike Corridor Of Fame More importantly, each member of our group is a health enthusiast. Therefore, we strive to bring you products that we trust and would personally use. Explore new bike paths and lightweight trails with the Timber Trail AL mountain bike by Schwinn. The suspension on the Schwinn Sidewinder may be adjusted using the preload function. Locate the preload dial on the entrance forks and switch it clockwise to increase stiffness or counterclockwise to lower stiffness. Find a setting that fits your driving type and weight for improved comfort and management.