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This is one of the most common questions among motorcycle and ATV enthusiasts looking to modify their final drive setup. The short, definitive answer is no, you should not run a 525 chain on a 520 sprocket. While they might seem close in size, the mismatch can lead to serious mechanical issues and safety hazards. This guide explains why and explores the correct components for your machine.
The numbers “525” and “520” are industry standard codes that describe the chain’s dimensions. The first digit (5) refers to the pitch—the distance between the chain’s rollers—which is 5/8 of an inch for both. The last two digits indicate the roller width.
A 520 chain has a roller width of 1/4 inch (0.250″). A 525 chain has a slightly wider roller at 5/16 inch (0.3125″). This 1/16-inch difference is critical. The sprocket teeth are machined to match a specific roller width for a precise, snug fit.
Attempting to install a wider 525 chain on a narrower 520 sprocket will cause improper engagement. The chain will not seat correctly in the sprocket’s tooth valleys, leading to excessive wear, premature sprocket hooking, and a significant loss of power transfer efficiency. The most dangerous outcome is increased risk of chain derailment, which can cause catastrophic damage to your bike and rider injury.
Q: What happens if I run a 525 chain on a 520 sprocket temporarily?
A: Even for a short period, it accelerates wear on both components, creates excessive noise and vibration, and compromises safety. It is not recommended.
Q: Can I use a 520 chain on 525 sprockets?
A: Similarly, this is inadvisable. A narrower chain on a wider sprocket will have lateral play, causing misalignment, uneven wear, and potential slippage.
Q: How do I know what size chain and sprockets I need?
A> Always consult your owner’s manual. The correct size is determined by your motorcycle’s make, model, and year, considering engine torque and final drive design.
For a complete technical breakdown on this topic, read our detailed article: Will A 525 Chain Fit A 520 Sprocket.
If your goal is performance, always change the chain and sprockets as a matched set. Downsizing from a 525 to a 520 system can reduce rotational mass, but it requires replacing both sprockets and the chain simultaneously with a kit rated for your bike’s torque output.
Ensure correct alignment, proper tension, and regular lubrication. A well-maintained, matched chain and sprocket set lasts longer and delivers optimal performance and safety.
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