Features: 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. 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. 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. 4.Size of single speed chainring: Speed- 45T 47T 53T 56T 58T; Please determine that your crank BCD specification is 130mm before purchasing. 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. Specification: Material: aluminum alloy Speed: 45T 47T 53T 56T 58T Color: Red/Gold/Silver/Black BCD: 130mm Package Includes: 1 x Bike Chainring Notice: Due to the different monitor and light effect, the actual color maybe a slight different from the picture color. Please allow 5-30mm differs due to manual measurement. Package List: 1 x Bike Chainring