RK Racing Chain UCT2100(50) Universal Chain Breaker and Rivet Tool

In this review of the RK Racing Chain UCT2100(50) Universal Chain Breaker, Cutter, Press-Fit and Rivet Tool the bottom line is straightforward: this tool is built for riders, mechanics, and hobbyists who need a reliable, single tool to cut, press-fit and flare 40 and 50 type chains. The reviewer found it especially valuable for O-ring chains thanks to its accurate press-fit holder and larger pressure bolt that make installing clip or rivet links repeatable and much easier than improvised tools. If precise chain joining and clean riveting matter, this tool delivers.

Key Features

• Chain compatibility: Quickly and easily breaks 40 and 50 type chain for fast chain removal and length adjustments.
• Press-fit accuracy: Press-fits tight tolerance 40 and 50 O-ring chain sideplates to the correct depth so clip or rivet links seat properly every time.
• Secure components: New design locks components into the tool body and uses a larger pressure bolt to reduce dropped parts and improve user control.
• Rivet flaring: Flares RK's special pin hole rivet links to the proper dimension, with a flare guard to prevent over riveting.
• Ergonomics and ID: Redesigned sure-grip handle improves comfort during use and laser engraved part number makes the tool easy to identify.
• Reversible holder plate: Press fit holder plate includes a reversible post to switch between clip plate and rivet plate for versatile installs.

Who It's For

This tool is best suited to motorcyclists, garage mechanics and DIYers who work with 40 and 50 type chains and need a compact, multi-function tool to cut, press-fit and flare rivet links without visiting a shop. It particularly benefits those who fit O-ring chains where precise plate seating matters for chain life and seal integrity.

It is not the right choice for users who need to work on 420/428 chains unless they also purchase the separate FP428JP and PH428 adapters. Customers seeking a general-purpose press for many chain sizes should verify compatibility before buying.

Pros & Cons

Pros

• Sturdy cutting and pin pushing action that eases removal and installation of 40 and 50 chains.
• Accurate press-fit holder and reversible post that ensure clip or rivet links sit at the correct depth.
• Improved design locks components in place and a larger pressure bolt makes operation smoother and safer.
• Rivet Flare Pin with a flare guard reduces the risk of over riveting and damaging links.

Cons

• Durability reports are mixed among users, so heavy commercial shop use may expose limits over long-term service.
• Requires separate adapters to handle specific smaller chain types like 420/428, which are sold separately.

Specifications

Model	UCT2100(50)
Compatible chain types	40 and 50 type chain
Functions	Break, cut, press-fit, rivet flare
Press-fit holder	Reversible post for clip plate or rivet plate
Rivet feature	Rivet Flare Pin with flare guard
Handle	Redesigned sure-grip handle
Warranty	Limited lifetime on tool body material and craftsmanship

Our Verdict

The UCT2100(50) is a well-considered multi-function chain tool that saves time and improves consistency for those working on 40 and 50 chains, especially O-ring installs. Its press-fit accuracy, locked components and flare guard make it a smart value for serious DIYers and weekend mechanics, though those needing broader chain compatibility or industrial-level durability should evaluate their workload and consider additional adapters or heavier duty options.

Frequently Asked Questions

Can this tool rivet 420 or 428 chains?
Not without the FP428JP and PH428 adapters, which are sold separately; out of the box it is for 40 and 50 chains.

Does it work with O-ring chains?
Yes, the press-fit holder and reversible post are designed to press-fit 40 and 50 O-ring chain sideplates to the correct depth for clip or rivet links.

Is the flare pin safe from over riveting?
Yes, the redesigned Rivet Flare Pin includes a flare guard to prevent over riveting and protect the link geometry.