ethirteen Core espec Chainguide - Bosch CX Gen4 (32-38T)

A lightweight, durable chainguide engineered specifically for Bosch® CX Gen4 e‑MTBs with a 55 mm chainline. Features an adjustable upper slider, alloy backplate, and wide‑offset design for modern Boost and Super Boost setups.

Core e*spec Chainguide – Bosch CX Gen4

The Core e*spec Chainguide delivers reliable, long‑lasting chain retention for Bosch® CX Gen4 motor systems running a 55 mm chainline. Built around a durable 2‑bolt aluminum backplate, it offers the performance of a full alloy guide with the wider offset required for modern e‑MTB drivetrains and 2‑piece chainrings.

Featuring e*thirteen’s latest adjustable upper slider, the guide provides exceptional retention while simplifying setup and ongoing maintenance. Designed for riders who demand dependable performance with minimal weight, it’s the ideal upgrade for Bosch CX Gen4 builds.

Key Features

• Adjustable upper slider with removable front plate for easy setup and service


• Durable 2‑bolt aluminum backplate for long‑term reliability


• 55 mm chainline compatibility for Boost & Super Boost e‑MTBs


• Wider offset design for improved clearance with 2‑piece chainrings


• Includes ISCG mounting hardware for 55 mm chainline

Technical Specifications

• Motor Fit: Bosch CX Gen4


• Capacity: 32–38T chainrings


• Backplate Material: 2‑bolt aluminum


• Mount: ISCG (hardware included)


• Upper Slider: Adjustable


• Color: Black


• Weight: 75 g (Bosch CX Gen4)

What’s in the Box

• Core e*spec Chainguide


• ISCG bolts × 2

A dependable, lightweight solution for Bosch CX Gen4 riders seeking clean, consistent chain retention with modern 55 mm chainline compatibility.