29-er Gravel Bike with Boost Spacing - What Drivetrain?!

You’ll want to use a Paragon 92mm BB. Check out the Raceface Crank Data Sheet below

T47 External is equivalent to PF30 (68 Road / 73 MTB)
T47 Internal is equivalent to 386EVO Road / 392EVO MTB

It’s important to note that the T47 Internal BB spec is 1mm narrower than 386EVO/392EVO thanks to Trek. You can read more about this in the T47 Internal Spec Topic.

The BB Shell width should end up at 91.5mm. If you’re planning to use the King BB you may have to use a couple spindle spacers since it was originally designed for 92.5mm

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