Feature:1. Made of the high quality aluminum alloymaterial, durable and sturdy, has a long service life.2. The rims adopts an asymmetrical design, so that the rims distributes tension evenly without sinking.3. The wheels can be assembled faster with this product, high performance, a good replacement.4. Suitable for bicycles with 20inch wheels and suitable for 20x1.5 and 20x1.75 tire type.5. It can be installed with 28 spokes, thicken rims, universal for bicycles and electric vehicles.Specification:Item Type: 28 Holes RimsMaterial: Aluminum AlloyColor: Silver BlackSpecification: 20inOuter Diameter: Approx. 41.8cm/16.5inInner Diameter: Approx. 37cm/14.6inHeight: Approx. 2.5cm/1.0inWeight: Approx. 386.0g/13.6ozNumber of Holes: 28 holesSuitable for bicycle 20x1.5 and 20x1.75 tire modelsSuitable for bicycles with 20inch wheels.Package List:1 x 28 Holes RimsNote:Please allow 12cm/0.40.8in error due to manual measurement. Thanks for your understanding.28 holes means need 28 spokes.Look at the tire model first, then count the spokes.This rims is thickened rims. Universal for bicycles and electric vehicles.The length of the spoke is determined by the rims, hub, and weaving method (the length can be multiple), so if it is not suitable for the original spoke, you can adjust it through the weaving method. If not, you can only buy a new spoke.