DJCRAWLER 58mm Omni Rack Easy Wheels for Brompton Folding Bike & Electric Bicycle, 10KG Load Omni-direction Roller Replacement Accessories with Bearing for 3Sixty Aceoffix [M6*45MM/60MM Screws] (gray)

Let the brompton portable bike push freely to all directions when folding instead of just driving in a straight line. Equipped with bearings suitable for brompton, can be used directly. The 6061T6 aluminum alloy shaft at the key shaft part has an overall lifespan that is 3-5 times longer than that of nylon shafts (yield strength and tensile strength are 3-5 times that of nylon materials.) Equipped with 45mm and 60mm M6 screws to fits different needs. The main body is made of nylon PA material, which has strong fatigue resistance, and the overall service life is several times that of ABS material. The separable design solves the problem that the traditional one-piece omnidirectional wheel is easily involved in the hair. You can easily take it apart, clean it and put it back together.