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Derailleur jockey and pulley wheel dimensions

A customer wanted some replacement derailleur wheels, which necessitated our measuring the pulleys of various makers' derailleurs. We thought we'd share that info here.

Maker: '94-'08 Campagnolo | Simplex | SunTour | Tacx Blue 10-tooth | Tacx Black 11-tooth


1994 - 2008 Campagnolo pulley wheels

  • Outside diameter: 38.58mm
  • Internal diameter of the pulley's hole: 8mm
  • Internal diameter of the pulley bushing that the securing bolt goes through: 5mm
  • Pulley has 10 teeth

The pulley pictured below is from a 10-speed aluminum Chorus rear derailleur, which was made in 2002 & 2003.

This pulley is compatible with the following derailleurs:

  • ’94-’96 Pulley wheels were RD-RE004, 9s.
  • ’97 Pulley wheels were RD-RE104, 9s.
  • ’98 Pulley wheels were RD-RE600 9s.
  • ’99 Pulley wheels were RD-RE700, 9s.
  • 2001-03 Pulley wheels were RD-RE600 for 9s Record and Chorus.
  • 2001-03 Pulley wheels were RD-RE700 for 10s.
  • 2004-2008 RD-RE600 10s with a width of 8.8mm for Record, and 8.4mm for Chorus and below.

Campagnolo began producing 11-speed systems in 2009.

Campagnlo pulleys

Outside diameter of the pulley, 38.6mm

Cmpagnolo Pulley

Internal diameter of the pulley bushing the bolt goes through.

Campagnolo pulley

Inside diameter of the pulley is 8mm


Simplex pulley wheels:

  • Outside diameter: 36.25mm
  • Internal diameter of the pulley bushing (far left in 1st picture) that the securing bolt goes through: 6mm
  • Pulley has 10 teeth

Simplex pulley

A Simplex pulley, disassembled.

Diameter

The outside diameter, 36.25mm


SunTour pulley wheels

  • Outside diameter of pulley: 38mm
  • External diameter of the bushing is 10mm.
  • Internal diameter of the bushing is just about 6mm
  • Pulley has 10 teeth

SunTour pulley

A new, bare pulley wheel.

SunTour pulley wheel

Let's call it 38mm.

Bushing diameter

External diameter of the bushing is 10mm.

SunTour pulley

Internal diameter is just about 6mm


Tacx blue pulley wheels

Compatible with these derailleurs:

  • Shimano 7 & 8-speed
  • Campagnolo 8, 9 & 10-speed
  • SRAM-ESP before 2000

Dimensions:

  • Outside diameter of pulley: 38.13mm
  • Internal diameter of the pulley bushing that the securing bolt goes through: 7mm
  • Pulley has 10 teeth

Tackx pulley

The micrometer says the internal diameter of the pulley bushing is 6.99mm. Let's call it 7mm.

Tacx pulley adapters

Tacx pulleys come with different sets of adapters for different derailleurs. This set has an internal diameter of 6mm.

Tacx pulley wheel

Here's the outside diameter, 38.13mm.


Tacx black 11-tooth pulley wheels

Dimensions:

  • Outside diameter of pulley: 41.42mm
  • Internal diameter of the pulley bushing that the securing bolt goes through: 6.93mm
  • Pulley has 11 teeth

Tacx box

Here's the box they come in.

Tacx black pulley wheel

Internal diameter of the pulley bushing is 6.93mm.

Tacx busning adapters

Tacx pulleys come with different sets of adapters for different derailleurs. This set has an internal diameter of 6mm.

Tacx pulley wheel

Outside diameter is 41.42mm

Tacx pulley wheel bushings

Here are the pulley wheels and the bushings.

Tacx pulley wheels

And which ones go with what derailleurs