• I think with DT 240 and 12mm axles you can use either type of lockring without issue, I always prefer external lockrings that use a BB tool rather than the internal type which use a cassette tool, but that is just personal preference.

  • Why? I hate using the BB ones - the tool sits too close to the disc. Have to for my dynamo hubs which is annoying as I need to carry two tools in the bike box.

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