What is a Quick Link? How to Install & Remove Chain Links
A quick link (master link) connects chain ends without special tools. Learn about SRAM PowerLock, Shimano quick links, and KMC Missing Links.
Quick Answer
Quick Link — A quick link (also called master link or missing link) is a special chain connector that allows you to join or separate your bike chain without tools. It consists of two interlocking plates with pins that snap together when the chain is pulled taut, making chain installation and removal quick and easy.
What is a Quick Link?
A quick link replaces a standard chain link with a tool-free connection point. Instead of pressing pins through plates, you simply snap the two halves together.
Common names by brand:
- SRAM: PowerLock / PowerLink
- Shimano: Quick Link / SM-CN900
- KMC: Missing Link
- Campagnolo: C-Link
Quick Link Types
Reusable vs Single-Use
| Type | Brand Examples | Can Reopen? |
|---|---|---|
| Reusable | KMC Missing Link, SRAM PowerLink (≤11s) | Yes (multiple times) |
| Single-use | SRAM PowerLock (12s), Shimano Quick Link | No (replace after opening) |
Important: 12-speed quick links are typically single-use because tolerances are tighter.
Quick Link by Speed
| Speed | Width | Compatible Quick Links |
|---|---|---|
| 6-8 speed | 7.1-7.3mm | KMC, Wippermann |
| 9 speed | 6.6mm | SRAM, KMC, Shimano |
| 10 speed | 5.88mm | SRAM, KMC, Shimano |
| 11 speed | 5.5mm | SRAM, KMC, Shimano |
| 12 speed | 5.3mm | Speed-specific only |
Critical: Always use the correct speed-rated quick link. A 10-speed link won't work properly on an 11-speed chain.
How to Install a Quick Link
Installation Steps
- Thread chain through derailleurs
- Place one half-link on each chain end
- Align pins through opposing holes
- Pull chain taut (or pedal backward) to snap closed
- Verify link is fully seated
Verification
- Link should sit flat with chain
- No gap visible between plates
- Should flex smoothly like other links
How to Remove a Quick Link
Without Tools
- Position link at top of chainring
- Apply inward pressure on both plates
- Push plates toward each other
- Link should disengage
With Quick Link Pliers
- Position pliers on quick link
- Squeeze handles to compress link
- Link separates easily
- Recommended for tight-tolerance links
When to Replace Quick Links
| Situation | Action |
|---|---|
| 12-speed link opened | Replace immediately |
| Worn chain replacement | Use new quick link |
| Link difficult to close | Replace (worn) |
| Visible wear on plates | Replace |
| Reusable link opened 3+ times | Consider replacing |
Common Quick Link Problems
Link Won't Close
- Ensure correct speed rating
- Check chain routing through derailleurs
- Apply more tension when closing
- Verify plates are aligned correctly
Link Opens While Riding
- Wrong speed link
- Link not fully seated
- Worn quick link
- Bent or damaged plates
Stiff Link After Installation
- Normal initially—will loosen
- Flex side-to-side to free
- Check for contamination
Quick Link vs Pin Connection
| Factor | Quick Link | Pin |
|---|---|---|
| Installation | Tool-free | Chain tool required |
| Removal | Easy | Destructive |
| Strength | Equal | Equal |
| Reliability | High | High |
| Cost | $3-8 | Included with chain |
| Reusability | Varies | One-time |
When sizing a new chain with a quick link, use our Bicycle Chain Length Calculator to determine the correct number of links before installation.