I want to change my drivetrain on my bike and i found everything except the chainring. So I was wondering if I could choose any chainring. Thank for yours response.

  • 1
    Pretty much all modern bicycles use a chain with a half-inch spacing between links, so any chainring will match from that standpoint. However, there are 4 different common widths for the chain, and the chainring needs to match in width as well. bike.bikegremlin.com/3555/… Mar 20, 2020 at 23:49
  • 2
    The BCD and bolt count is important to match as well - a 4 bolt spider won't hold a 5 bolt chainring, and there are at least 3 patterns of 4 bolts. Plus a bunch of different diameters.
    – Criggie
    Mar 21, 2020 at 0:08
  • You also have to look out for narrow-wide chainrings, which aren't compatible with front derailleurs.
    – RLH
    Mar 21, 2020 at 2:14

1 Answer 1



The chainring needs to be compatible with the rest of the drivetrain.

Chainring pitch (width + spacing) gets tighter with increased cogs on the rear wheel. So a 9 speed chainring is not compatible with an 11 speed drivetrain. Additionally there are new narrow-wide chainrings for single chainring setups will not work well in a system with a front derailleur.

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