Schwinn Solution GSD Men's Mountain Bike (26-Inch Wheels, Medium) Shimano equipped rear deraileur with Shimano EZ fire shifter combine for a reliable shifting performance Strong and durable N'litened alloy frame with epicenter seat stay Powerful and reliable MECH 7.0 disc brake by Radius. Alloy rims with quick release alloy disc hubs and stainless steel spokes Threadless and alloy seat post