DECKAS positive and negative tooth plate disc / elliptical disk Brand: DECKAS Disc type: disc / elliptical disc Color: Black Red Blue Silver Purple Green Gold Specifications: 32T Weight: 100g Applicable crank: 104BCD Installation Notes: 1. The BCD of the tooth piece is 104. The purchased friend carefully determines that his crank is 104BCD (the diameter of the circle formed by the center point of the four nail holes is 104 mm). Don't make a mistake, otherwise it will not be installed. . 2. The disc hole of this platter adopts no sinking design. The disc nail can directly use the three discs and the second disc nail of the sprocket wheel to be modified, without separately purchasing a single disc nail. product description: We use thick, thin tip designs to reduce the chance of chain drops. Processed with 7075 aluminum alloy with good fatigue strength and processability This disc can be used on most Shimano sprocket wheels, as well as some FSA and Sram sprocket wheels. Please ensure that the sprocket is BCD104 (M390 sprocket/M4000 sprocket/M780 sprocket/M590 sprocket) before purchase. No need to install the chain guide, do not worry about falling off the chain, suitable for XC-AM models modified single disc Precautions: 1 When installing, the positive and negative teeth should correspond to the wide and narrow positions on the chain respectively. The positive teeth correspond to the chain width, and the negative teeth correspond to the narrow position of the chain. 2 Do not use the chain for too long, because the chain will be stretched a lot longer than the use period, so it is easy to use at a single speed will increase the chance of losing the chain. 3 Any brand of single-speed discs will not promise and guarantee not to lose the chain, especially if there is no installation In the case of a chain guide device, therefore, the addition of a chain guide is an effective way to reduce the chain drop. Some UCI riders using a single-disc shifting system also have a chain guide.