The new Better Boost Adapter Kits allow you to keep your existing 15x100mm front wheel as you upgrade to a new Boost 15x110mm fork.

What makes them better?

The Better Boost Adapter Kit consists of two precisely machined end caps and a brake spacer* (and requisite bolts), and it requires NO DISHING.

What hubs are compatible?
DT-Swiss 350-based 15x100mm 6-bolt front hubs

6-bolt and Centerlock version now available.
Compatible Hubs: 350 Classic MTB db IS (15x100mm), 370 (15x100mm)
Compatible Wheels: X 1700 SPLINE TWO (27.5, 29), X 1900 SPLINE (27.5, 29), M 1700 SPLINE TWO (27.5, 29), M 1900 SPLINE (27.5, 29), E 1700 SPLINE TWO (27.5, 29), & E 1900 SPLINE (27.5, 29)

DT-Swiss 240-based 15x100 6-bolt front hubs (not compatible with 240 hubs with threaded end caps)

6-bolt and Centerlock version now available.
Compatible Hubs: N/A
Compatible Wheels: XM 1501 SPLINE ONE (27.5, 29) & EX 1501 SPLINE ONE (27.5, 29)
DT-Swiss 240 OS Straight Pull & Classic Spoke Oversized 15x100 front hubs

Stan's 3.30 15x100 6-bolt front hubs

Compatible Hubs: 3.30, 3.30 Ti, and ZTR hubs (NOT COMPATIBLE WITH 3.30HD)
Compatible Wheels: Stan's No Tubes-produced wheelsets using the above hubs (ie complete Stan's wheelsets such as the Crest, Arch, and Flow series)

Stan's NEO 15x100 6-bolt front hubs

Compatible Hubs: Neo and Neo Ultimate hubs. Not compatible with center lock hubs
Compatible Wheels: Recent Stan's No Tubes-produced wheelsets using the above hubs (ie complete Stan's wheelsets such as the Crest MK3, Arch MK3, and Flow MK3 series)

Industry Nine Torch Classic 6-bolt front hubs

6-bolt and Centerlock versions now available.
Compatible with 2013 and newer "Torch" 6-bolt mountain hubs
Not compatible with center lock hubs.

Hope Pro 2, 2 EVO, and 4 6-bolt front hubs

Compatible with all Hope Pro 2, Pro 2 Evo, and Pro 4 mountain bike front hubs with 6-bolt disc mounts.

Chris King ISO Disc 15x100 6-bolt front hubs

Compatible with Chris King ISO Disc 15x100 hubs (Better Boost end caps press-fit over existing end caps on this model)

Other compatibility info:

Better Boost adapter kits are not compatible with QR-only or oversized/20mm hub shells (unless otherwise noted).
Kits are not suitable for use with Rock Shox RS-1.
All models feature the standard 15mm axle O.D. dimension, non are of the larger "Torque Cap" variety.
Please note that there are 6-bolt and centerlock-specific kits, they are not interchangeable. Centerlock kits include a brake adapter the increases rotor size by 20mm.