Shimano Bottom Bracket — Euro Square

Overview

The Shimano Euro Square BMX Racing bottom bracket delivers Shimano quality and performance in a cartridge bearing square bottom bracket design. Featuring a chainline stabilizer for better chainline stability, this bottom bracket is available in three structure configurations (Standard, E-type, and chain case options) and two width options (113mm or 118mm) to suit different frame and crankset combinations.

Key Features

• Cartridge bearing square bottom bracket — Sealed, maintenance-free design with smooth rotation

• Chainline stabilizer — Provides better chainline stability for consistent power transfer

• Three structures available — Standard, E-type, and chain case options for various frame configurations

• Two width options — 113mm or 118mm axle lengths to fit different bottom bracket shells and crankset requirements

• Aluminum adapter material — Lightweight and corrosion-resistant

• Shimano quality — Trusted performance from a leading component manufacturer

• Weight: 290g

Technical Specifications

• Bottom Bracket Type: Square

• Standard: Euro (English threaded — 1.37" x 24 TPI)

• Axle Interface: Square taper

• Weight: 290g

• Axle Width Options: 113mm or 118mm

• Structure Options: Standard, E-type, chain case

Compatibility & Ideal Use Cases

• Frame compatibility: Euro/English threaded bottom bracket shells (1.37" x 24 TPI) — standard on most BMX frames

• Crankset compatibility: Square taper cranksets only (not compatible with Spline Drive, Octalink, or 24mm external bearing cranks)

• Width selection:

  • Measure your existing bottom bracket axle length (L = length of bottom bracket axle)

  • Select 113mm or 118mm matching your original axle length

• Chainline stabilizer: Improves chain alignment for reduced wear and more efficient power transfer

• Best for: BMX racing, dirt jump, and freestyle bikes with Euro threaded shells

• Ideal use: Replacement bottom bracket for square taper cranksets; BMX racing where chainline stability is critical

• Not suitable for: American or Mid bottom bracket shells (different threading/shell dimensions); 19mm, 22mm, or 24mm spindle cranks; 3-piece cranks with different spindle standards

Width 113 or 118mm ?
Measure the bottom bracket axis you wish to replace.
L = length of the bottom bracket axle.