Features1[Durable Material] Made of natural rubber, the design of the beehive structure on both sides greatly improves the cushion flexibility of the tire. The surfaces is equipped with rubber grooves to provide grip and handy in various complex road conditions. 2[More Flexible] The tire can be stretched, but it will always recover its shape. Its cushioning can recover its shape according to pressure and temperature changes. Its beehive shaped holes make it more flexible to deal with various road conditions. 3[Shock Absorbing Effect] This solid tire is durable, puncture proof, explosion proof, and has a better shock absorbing effect, which greatly improves the comfort of the user, so you can use it with confidence. 4[Energy Efficient] Lightweight tires are more energy efficient, can be exchanged for longer cruising range, and at the same time avoid the embarrassment of inflatable tires. It is the choice for balance vehicles. The luminous style can light in the dark environment at night. 5[Fitment] Fit for Ninebot 9 Nano balance bicycle. The card slot width is 36mm, the inner diameter of the card slot is 155mm, and the minimum inner diameter is 142mm. It has good flexibility, good riding experience and long cruising range.SpecificationItem Type: SolidTireMaterial: RubberTire Width: Approx. 50mm / 2inCard Slot Width: Approx. 36mm / 1.4inIncluding Card Slot Inner Diameter: Approx. 155mm / 6.1inWithout Card Slot Minimum Inner Diameter: Approx. 142mm / 5.6inOuter Diameter: Approx. 205mm / 8.1inTire Specification: 8.5 x 2.125Load Bearing: Approx. 100kg / 220.5lbFeature: It can emit light and change color in dark environmentFitment: Fit forNinebot9NanobalancebicyclePackage List1 x SolidTire