Unior Chain Tool — 1647HOBBY/4P (Compact Workshop Chain Breaker)
This is Unior’s compact “Hobby” chain tool—built to the same standards as their Pro version, just in a smaller, lighter form.
It’s a dependable shop-grade chain breaker for installing and removing pins on most modern bicycle chains.
Key Functional Details
- Compact 3-piece chain tool design
- Works on standard bicycle chains (single speed through multi-speed)
- Hardened driving pin for consistent chain pin removal
- Smaller footprint than Unior Pro chain tool
- Steel construction for durability
- Model: 1647HOBBY/4P
Compatibility & Technical Notes
- Compatible with most 1–12 speed bicycle chains
- Designed for traditional pin-style chain installation and removal
- Can be used to break chains for quick-link installs
- NOT compatible with BMX half-link chains
- Driving pin is NOT replaceable
- Manual hand tool only
Service / Ownership Context
This is a compact shop tool for regular chain service. It performs like the Pro model but with a smaller body. The fixed pin means long-term abuse will eventually end its life.
Fit & Use Signals
- Good Fit: Home mechanics, commuters, gravel riders, and anyone doing basic chain installs or replacements.
- Not A Fit: High-volume shops or riders who frequently drive stubborn e-bike pins and want replaceable tips.
This is basically Unior’s Pro chain tool in a smaller body.
It works great, but the big difference is the pin isn’t replaceable. Once it’s bent or worn, the tool is done.
For normal chains it’s totally fine. Where people kill these is trying to push e-bike pins, seized pins, or hammering sideways.
Most common mistake: users don’t back the anvil off far enough before starting and bend the pin immediately.
Another mistake: trying to fully remove Shimano rivets instead of stopping halfway and snapping the plate.
Ride-side impressions don’t matter here — this is about feel in the hand. Threads are smooth, alignment is good.
Failure point: drive pin. That’s it.
Who this is really for: home mechanics and light shop use.
Who should avoid: heavy-service environments or anyone doing chains daily — they should buy the Pro model with replaceable pin.
Mechanic advice: always center the pin carefully, go slow, and stop once the outer plate is free. If you’re installing quick links, just push far enough to break the chain — don’t drive pins all the way out unless required.