Zipp Front Wheel Axle End Cap Set Description: This Zipp Front Wheel Axle End Cap Set works to adapt Zipp select wheels equipped with ZM900 and ZM1 3ZERO thru-axle hubs for use in conjunction with forks with 15 x 110mm boost spacing. Features: Front End Cap set for select Zipp wheels Compatible with 1ZERO HITOP and 3ZERO Moto Zipp Wheels Also compatible with ZM900 and ZM1 3ZERO hubs Specifications: Color: Black Hub/Axle Spacing: 15 x 110mm Material: Alloy