Posted at: Feb 4, 2021
We have compiled a PCD compatibility chart to use as a guide when replacing the chainring on your crank.
Table of contents
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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.
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.
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 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 |
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.
In the case of 4-arm, which is the current mainstream of cranks, the following three types are the most common.
In the case of 5-arm cranks, which used to be the mainstream of cranks, the following four types are the most common.
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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