SHIMANO ALFINE double - pulley chain tensioner in sleek black. Ideal for SHIMANO ALFINE - equipped bikes, it can handle a 16 - tooth difference in front chainrings and sprockets from 18 to 20 teeth, ensuring smooth and reliable operation.

Using this chain tensioner is easy. First, find a suitable spot on your SHIMANO ALFINE - equipped bike to install it. Make sure it's firmly attached. When riding, you'll notice smoother pedaling as the tensioner keeps the chain in place. Remember, avoid over - tightening the tensioner as it can cause unnecessary wear on the chain and pulleys. For maintenance, regularly clean the pulleys with a soft cloth to remove dirt and debris. You can also apply a light lubricant to the moving parts every few months to keep them running smoothly. If you notice any unusual noises or if the chain starts to slip, it might be time to check the tensioner's alignment and tightness.