How do you pop a master link on a bike?

Answer 1

Depends a bit on which type of bike it is. If it's a single-speed or internally geared bike with a wide chain it might have something looking like a hairpin outside one of the side plates. Snap that one off and the pins can be pulled through while still attaced to the other side plate.

If you've got an externally geared bike, or basically any bike with a narrower chain you won't have the hairpin thingy. In that case you'll have to look for a link where the side plates have keyhole looking holes around the pins. Squeeze that link together lengthwise and it'll come apart.

Do note that Shimano chains might not come with a master link, but instead with one special pin. It that's the case you'll need a chain breaker tool.

Answer 2

You need a special tool called a chain breaker. Then to get it back together again it's easiest to use a master link. Make sure you get one with the right width for your chain.

Some chains, particularly in the 1/8" size can be reconnected by pressing the pin back in.

Answer 3

Depends on the type of master link. some have a spring clip(looks like an U) on the outside of one of the plates. Remove this clip (push it along the chain) and the link can be pushed out sideways.

Other master links consist of two identical halves, with the pins locking into keyhole shaped cutouts in the plates. These can be opened if you pinch them together a little lengthwise. Push at the rollers, and not the plates.