With the Pro 4, Hope heralds the latest evolution of their hub. The hub, which is already known for its good workmanship and resilience, has been further improved in terms of rigidity and durability. It has a larger flange diameter than its predecessor and thus enables even stiffer wheels. Familiar features such as the various anodized colors and the sealed stainless steel bearings have been retained. The Boost version has a wider hub body than the QR15 variant. The flanges are each moved outwards by 5mm, which optimizes the angle from spoke to rim and thus enables significantly stiffer wheels, which results in a significant increase in performance, especially with 29" wheels. In addition, the clamping surface on the fork is larger and enables a extremely stiff connection between fork and wheel.

- Technical specifications:
- Material: Aluminum 2014 T6
- Installation width: 110 mm
- Axle: 15x110 mm thru axle
- Number of holes: 28 holes
- Brake disc mount: 6-hole standard
- Bearing: 2 sealed stainless steel ball bearings
- Weight: 192g