Those are nimbus ventures. I’d advise against drilling those cranks. Vcx are a much better choice. M41 probably work well too. Here’s the vcx I did for my 26 and 29er The ventures aren’t quite as robust as the vcx but I’m not planning on doing much on these so I wasn’t that worried about it. The groove on the back is narrower than the vcx so the drill bit liked to bind towards the end if the hole.
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