Best Selling in the U.S.A. Greenfield's Kickstand enjoys enormous popularity. It's lightweight, durable, and looks great on any bike. Kickstand features: Certified Non-Corrosive Casting, Dual Spring Pressure Plate, Snap Action Mechanism, Non-Slip Clamping Surface, Hardened Steel Pivot Pin, Zinc Plated Screw, Calibrated Stem, and Solid Non-porous Casting. Weight: Only 266 grams The RetroKit is designed to clear the wire of certain Shimano derailleurs with a new cutaway casting. This kickstand is mounted from underneath. Our unique new engineering allows for quicker installation, and it fits some unusual frames that our original stand may not without the need for adjustment.