Do all makes of chain rings for dh bikes fit different crankset?

Chainrings for DH bikes are not universal and may not fit all cranksets. There are different variations in chainring bolt circle diameters (BCD) and crankset spindle interfaces. Some common BCD standards for DH chainrings include:

1. 104 BCD (4-bolt): This is a common BCD found on many DH cranksets. Chainrings with a 104 BCD will typically have four mounting bolts that are evenly spaced around the ring.

2. 88 BCD (3-bolt): This is another prevalent BCD for DH chainrings. Chainrings with an 88 BCD will have three mounting bolts arranged in a triangular pattern.

3. 120 BCD (5-bolt): This BCD is less common in DH but can be found on some cranksets. Chainrings with a 120 BCD will have five mounting bolts arranged in a circle.

In addition to BCD standards, chainrings must also be compatible with the spindle interface of the crankset. Some cranksets use a traditional square taper interface, while others use more modern standards like splined or press-fit spindles. It is essential to select a chainring that is compatible with the specific spindle interface of your crankset to ensure a secure and reliable connection.

To ensure compatibility, it's recommended to check the specifications and compatibility information provided by the chainring manufacturer before making a purchase. Alternatively, you can consult with a knowledgeable bike mechanic or retailer to help you select the correct chainring for your DH bike.