Features an aluminum inner carrier for lightness and steel outer teeth for durability. It’s the best of both worlds but the most expensive. 3. Pitch and Size

Go up teeth in the front or down teeth in the rear. This is ideal for long-distance touring to reduce engine vibration and improve fuel economy.

Significantly lighter (reducing unsprung weight for better handling) but wears out much faster. Best for racing or track use.

You must match the of your sprocket to your chain. Common sizes include 520, 525, and 530 . The first digit refers to the distance between pins. The last two digits refer to the width.

The industry standard. It is heavy but incredibly durable, lasting 15,000–30,000 miles with proper maintenance. Best for commuters and touring.

Changing one tooth on the front is roughly equivalent to changing three teeth on the rear . 2. Material Choices