Incredible launching wheel, "proof puncture" system without air. 37cm-diameter-Incutable launching, "Optiflex-LitePuncture Proof" system without air. Outside diameter 370mm DIY INTERVENTION 25MM 80mm, axis 75mm Optiflex-Lite Trolley Wheel Optiparts DESCRIPTION Large Optiflex-Lite Puncture Proof Wheels for Optiparts Optimist Trolleys, with a diameter of 37cm. The Optiflex-Lite Trolley Wheels Are the Ultimate in Wheel Design. They are ultra light; The Weight is only 1750 grams. Followed for 25 (1 ″) x 75 mm axles