What’s the difference between 520, 525 and 530 chains?

My owners’ manual says I should replace my chain with one marked ‘50ZVM’, ‘50LFO’ or some similar two-digit code. What is the equivalent EK chain?

What kind of chain lube should I use?

How often should I lube my chain?

What should I use to clean my chain?

What’s the difference between O-rings and EK’s Quadra-X Ring seals?

How can I tell when I need a new chain?

I’ve just installed a new chain, and there’s grease all over my rear wheel. Is this normal?

Is there a break-in period for new chains?

My chain is broken. Was this caused by a manufacturing defect?

How much chain slack should I have?

How do I count chain links?