PCD compatibility chart for cranks and chainrings

Posted at: Feb 4, 2021

We have compiled a PCD compatibility chart to use as a guide when replacing the chainring on your crank.

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When replacing the chainring, the PCD must be the same.

The PCD is the number that determines whether the chainring of the crank is compatible with the chainring.

When choosing a chain ring, the following things should be the same.

  • Number of arms’ hole
  • PCD

However, even if the number of arms and PCD match, there are some combinations that are not compatible depending on the number of sprockets, so compatibility must be checked properly.

PCD from the distance between the two holes

Even if you don’t know which model of crank you have, you can get the PCD by measuring the distance between the holes that hold the chainring.

Distance between two holes on chainring
Distance between the two holes(mm) PCD(Φ・mm)
34.1 58
45.0 64
435 74
50.6 86
55.3 94
74.0 104
64.7 110
71.7 122
76.5 130
79.4 135
84.7 140

Arm type and PCD

For Shimano and SRAM cranks, PCD is determined by arm type. For Shimano cranks for road bikes, the PCD is basically 110mm for both 4-arm and 5-arm.

4 arm

In the case of 4-arm, which is the current mainstream of cranks, the following three types are the most common.

  • PCD: Φ64mm
  • PCD: Φ104mm
  • PCD: Φ110mm

5 arm

In the case of 5-arm cranks, which used to be the mainstream of cranks, the following four types are the most common.

  • PCD: Φ74mm
  • PCD: Φ104mm
  • PCD: Φ110mm
  • PCD: Φ130mm

In the case of Shimano, 110mm or 104mm is often used for so-called compact cranks (50T outer diameter), while 130mm is used for 53T outer diameter.

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