This is the new Through-Drive (Pass-Through) Center Axle, first introduced with the B36-2 and now implemented in the B36-3 as of April 2026.

It is fully compatible as an upgrade for existing B36-3 units equipped with the earlier center axle design.

The updated through-drive design improves how power is distributed across the drivetrain, helping to reduce driveline twist under load, especially during steep climbs. This results in smoother power delivery and better overall stability when tackling challenging terrain.