Features1Natural Rubber Material: Natural rubber material, special beehive structure design on both sides greatly improves the cushion flexibility of the tire. The surface has rubber grooves to provide grip. 2Good Compatibility: Fit for Ninebot No. 9 Nano balance bicycle, slot width is 36mm, including slot inner diameter is 155mm, minimum inner diameter is 142mm, good flexibility, good riding experience. 3Stretch Resistance: Tire can stretch, but it will always recover its shape. Its cushioning can recover its shape according to pressure and temperature changes. Beehive shaped holes also make it more flexible to deal with various road conditions. 4Lightweight Design: This non pneumatic tire is very light, energy saving, can be exchanged for a longer cruising range, anti puncture, explosion proof, and has a better shock absorption effect. 5Easy Installation: When installing, you can soak in hot water for about ten minutes to soften it, increase flexibility and make it easier to install. This tire is a good choice for balance bicycle travel.SpecificationItem Type: Rubber TyreMaterial: Rubber Tire Specification: 8.5x2.125Load Bearing: Approx. 100kg / 220.5lbTire Width: Approx. 50mm / 2.0inSlot Width: Approx. 36mm / 1.4inInner Diameter with Slot: Approx. 155mm / 6.1inMinimum Inner Diameter without Slot: Approx. 142mm / 5.6inOuter Diameter: Approx. 205mm / 8.1inApplication: Fit for Ninebot 9 Nano Balance BicyclePackage List1 x Tyre