Pedro's, Chain Checker Plus II

Pedro's Chain Checker Plus II is a professional-grade, multi-functional workshop tool designed to accurately measure bicycle chain wear. Unlike basic tools that can give false readings, its advanced three-point design isolates pin wear from internal roller play, saving riders from prematurely discarding good chains.

Key Features

• Advanced Three-Point Isolation:
  Legacy two-point gauges push chain rollers in opposite directions, combining roller wear and pin elongation for an inaccurate reading. The Chain Checker Plus II pushes adjacent rollers in the same direction, isolating true pin-to-pin structural wear.
• Dual Wear Indicators:
  Features precision laser-cut steps to check for 0.5% and 0.75% wear limits.
• SRAM Flattop & Eagle Approved:
  Formally approved by SRAM for high-tolerance drivetrains, making it fully compatible with standard 1-to-13 speed systems, SRAM Eagle 12-speed, and road Flattop chains.
• Integrated Chain Hook:
  The top cutout hooks into links to hold chain slack together, simplifying master link installation or removal.
• Chainring Nut Wrench:
  The curved end features a built-in slot that fits into slotted chainring backing nuts, stopping them from spinning while you tighten chainrings.

Wear Thresholds for Modern Drivetrains

Using the tool incorrectly or waiting too long to change a chain can cause skipping and accelerate wear on expensive cassettes and chainrings. Follow these factory replacement rules:

• 0.5% Wear:
  The replacement threshold for high-density 11-speed, 12-speed, and 13-speed drivetrains.
• 0.75% Wear:
  The replacement threshold for standard 9-speed and 10-speed setups, or lower-gear city bikes.

How to Use the Three-Point System

1. Insert the tool's hooked Point 1 into a link opening.
2. Press down firmly on Point 2 to apply tension and seat the tool securely against the chain rollers.
3. Drop Point 3 down onto the chain link. If it drops entirely into the link gap, your chain has met or exceeded that wear percentage and must be replaced.

By following these steps and leveraging the advanced features of the Chain Checker Plus II, you can ensure your drivetrain remains in optimal condition and avoid unnecessary wear on expensive components.