Chains
A drive chain is sized by two numbers: the pitch (the "4" or "5" family — 420, 428, 520, 525, 530) and the link count. Start from what is on your bike now; the size is usually stamped on a side plate. Small-displacement bikes, pit bikes and youth ATVs run 420 or 428; most dirt bikes and middleweight street bikes use 520; heavier street and touring machines step up to 525 or 530. Changing pitch also means changing both sprockets, so only do that as a deliberate conversion. Link count can be trimmed with a chain breaker, so buy a chain at or above your stock length.
Within a size you will see three constructions. Standard (non-sealed) roller chain is the light, inexpensive choice for motocross and off-road bikes that are cleaned and lubed often. O-ring chain keeps grease sealed inside the pins for longer life on street and dual-sport bikes. X-ring uses a shaped seal for lower friction at a higher price. Our KMC range covers all three in the common sizes, alongside ProX MX roller chain, JT Sprocket heavy-duty chain and EK non-sealed chain.
Replacing a chain without new sprockets shortens its life, so check the front and rear sprockets for hooked teeth at the same time. Master links, clip and rivet type, are in Connecting Links. Snowmobile and side-by-side owners will find Venom and SPI silent chains (Hy-Vo style, sized by width and link count) under Miscellaneous Chains. Every order over $50 ships free to the lower 48.
