Monolith

CalipERD Rim Measuring Device LTD Green

Monolith CalipERD Rim Measuring Device LTD Green is a purpose-built tool for wheel builders who want repeatable ERD (Effective Rim Diameter) measurements without the guesswork that can lead to incorrect spoke lengths. Its fast, direct measuring process helps streamline rim setup for new builds and rebuilds across a wide range of wheel sizes, including modern wide and fat bike rims.

• Accurate ERD measurement - Supports more reliable spoke length calculations for consistent wheel builds
• Wide rim size range - Measures rims from 12" to 36" to cover everything from small wheels to large-diameter applications
• 53mm throat depth - Clears wide profiles, including many fat bike rims, without forcing awkward tool positioning
• Calibration tool included - Helps keep both internal and external feeler sets properly set for consistent, repeatable readings
• LTD Green finish - Easy to spot on a busy bench while keeping the tool set visually organized