Boost 110 (front)
Boost 110 is the modern mountain bike front hub standard. It's 110 mm wide, 10 mm more than the classic 100 (5 mm per side), and uses a 15 mm thru-axle. As on the rear, spreading the hub flanges opens the spoke angle and stiffens the front wheel, while making room for wide tires. It pairs with the rear Boost 148: together they make the Boost «package». It isn't compatible with 100 mm forks without a conversion kit.
It's the front partner of Boost 148: the fork widens 10 mm so the 29-inch wheel doesn't flex.
What it is and why
The logic is identical to the rear: more width between hub flanges = spokes in a wider triangle = stiffer wheel. On the front the jump is 10 mm (5 per side) because it starts from 100. The axle stays 15 mm in diameter, the usual on mountain forks.
Key data
What it fits
It fits only Boost 110 mm forks. It won't fit 100 mm forks. A 100×15 hub can be adapted to a 110 fork with a conversion kit (two +5 mm caps and rotor repositioning), but it isn't ideal.
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Frequently asked questions
Is Boost 110 compatible with a 100 mm fork?
No. They're different widths; the fork must be 110 mm. A 100 hub can be adapted to 110 with a conversion kit, not the reverse without machining.
Is the Boost 110 axle 15 mm?
Yes, the usual on mountain. What changes versus 100×15 is the hub width (110 vs 100 mm), not the diameter.
Do Boost 110 and Boost 148 go together?
Yes: they're the front and rear pair of the same Boost standard. A Boost bike usually runs 110 front and 148 rear.