Each hub is specific, and has its own unique way to convert.

Some DT Swiss are just pop-in end caps, other DT Swiss have thread in end caps.

Some hubs require a whole new axle, some are just end caps.

You will need to find out the exact hub you're using as a starting point.

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Alex Arman

Strava

You're best off e-mailing Formula directly. They're know the best way to accomplish this with their hubs.

One question: is your Rear-Hub on your bike 135 spacing? This is typical for QR hubs / frames, but less common with thru-axle set-ups. I'd verify that the spacing is correct before worrying about conversion.

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Thanks for the responses - looks like they're Niner-branded Formula hubs so I've emailed both companies to see what my options are.

those will work perfectly. I use one in my front wheel on my xc bike.