Park Tool CT-5 Mini Chain Tool — Compact 5–12-Speed Chain Tool with Replaceable Pin

The Park Tool CT-5 Mini Chain Brute is a compact, carry-everywhere chain tool engineered to remove and reinstall pins on single-speed and 5–12-speed derailleur chains with a replaceable driving pin.

Small enough to slip into a saddle bag or jersey pocket, this mini chain tool gives cyclists a reliable way to handle broken or stubborn chain links on the road, trail, or during quick shop repairs. Weighing just 77 grams and sized at 60mm x 55mm x 15mm, it balances portability with the functional features needed to work on most modern bike chains. The CT-5 is built with a shelf to help loosen tight links and a threaded, replaceable pin (part # CTP) so the tool stays useful over years of use.

What chain types and speeds will the CT-5 work with?

The CT-5 fits a wide range of chains from classic 1/8" single-speed chains up to contemporary derailleur chains spanning 5 to 12 speeds. It accommodates the different link widths used across those speeds while giving precise pin control for safe removal and installation. For the narrowest modern chains, use steady alignment and the replaceable pin to avoid damage.

• Compatible: 1/8" single-speed chains
• Compatible: derailleur chains from 5-speed up to 12-speed
• Replaceable driving pin (CTP) for continued accuracy
• Shelf feature assists with loosening stubborn links

How does the shelf help when a link is tight or corroded?

The integrated shelf provides a stable surface to bend the chain slightly and relieve tension on the pin, making the initial turn easier and preventing the driving pin from slipping. This is especially helpful when chains are dirty, rusted, or under slight tension from drivetrain alignment. The shelf reduces the risk of damaging adjacent plates while you work the pin out.

• Creates leverage to free seized pins
• Holds the chain steady for precise pin driving
• Minimizes lateral movement that can damage chain plates
• Useful on roadside repairs when tools and workspace are limited

Can I replace the pin if it wears or breaks?

Yes — the CT-5 uses a replaceable threaded pin (Park Tool part # CTP), so you don't need to buy a whole new tool when the pin becomes worn. Threaded replacement pins restore original performance and maintain alignment for reinstalling chain links safely. Keeping a spare CTP on hand is a good practice for heavy users or mechanics.

• Replaceable threaded driving pin (CTP)
• Simple screw-out and screw-in replacement process
• Maintains tool accuracy and longevity
• Cost-effective versus replacing the entire tool

Why choose the CT-5 as a take-along chain tool?

At just 77 grams and compact dimensions, the CT-5 is designed for riders who want a dependable chain tool without extra bulk. It packs the essential capabilities — compatibility with modern chains, a shelf for stubborn links, and a replaceable pin — into a form factor that fits easily into daily-ride kit. For commuters, gravel riders, and touring cyclists, it offers peace of mind when a chain issue could otherwise end a ride.

• Ultra-light 77 g weight for minimal carry burden
• Compact 60 x 55 x 15 mm footprint fits most saddle or seat pack pockets
• Durable construction suitable for roadside and workshop use
• Works with the majority of modern drivetrains (5–12 speed)

Who is this for: The Park Tool CT-5 Mini Chain Brute is ideal for cyclists who prioritize a lightweight, reliable on-bike repair option — commuters, gravel and road riders, tourers, and bike mechanics who need a compact backup for chain removal and pin replacement. If you want a simple, well-built tool that tackles single-speed to 12-speed chains and keeps working with a replaceable pin, the CT-5 is a practical choice.