Motorcycle chain sizes explained:

There are generally three sizes of chain used on the modern motorcycle.

These are all based on the 5/8-inch (16mm) pitch; and are normally known and referred to by the prefix “5” (ie 5 eighths of an inch).

The smallest chain in general motorcycle use is the 520 – the internal width between plates is also based on 1/8 inch. So the “20” refers to 2 x 1/8 inch = 1/4 (6.35mm). The total width of the chain can range from 20mm to 21.5 mm. These chains are generally found on mid-range motorcycles.

The next size is 525 – this is 2.5 x 1/8-inch = 5/16 (8mm) hence the “25”). In metric, this ranges from 22.6mm to 23.7mm. These chains are generally found on larger motorcycles.

The third size is 530 – this is 3 x 1/8-inch = 3/8 (9.5mm) hence the “30”. In metric, this ranges from 24.9mm to 25.3mm. These chains are generally found on more powerful or heavier motorcycles.

If you don’t know the chain size required for your bike, use the “Bike Finder” on the Shop page.