Features:_x000D_1.Made of aluminum alloy, CNC machined process and anodic oxidation electroplating, with the trait of smooth surface, bright color, not fading and corrosion resistance._x000D_2.The chain ring can distribute trampling power more reasonably so that protect knee more effectively and reduce knee wear during climbing race and long-distance riding._x000D_3.Eliminate trampling dead point, enlarge force distance for the best starting point, solve chain skipping problem, save more effort and increase speed, without any hindrance or noise._x000D_4.Size of single speed chainring: Speed- 45T 47T 53T 56T 58T; Please determine that your crank BCD specification is 130mm before purchasing._x000D_5.For 14/16/20in folding bicycles, 45/47T is fit for 14in bike, 16in folding bike usually select the chainring less than 53T, and 20inch folding bike need the chain ring less than 56T._x000D_Specification:_x000D_Material: aluminum alloy_x000D_Speed: 45T 47T 53T 56T 58T_x000D_Color: Red/Gold/Silver/Black_x000D_BCD: 130mm_x000D_Package Includes:_x000D_1 x Bike Chainring_x000D_Notice:_x000D_Due to the different monitor and light effect, the actual color maybe a slight different from the picture color._x000D_Please allow 5-30mm differs due to manual measurement.Package List:_x000D_1 x Bike Chainring