DT Swiss 6903 Special Front Hub Bearing – 240s – 17.8x30x7mm

DT Swiss 6903 Special Bearing – Front Hub – 240s

This DT Swiss factory special 6903 bearing is engineered specifically for DT Swiss 240s front hubs. Unlike standard 6903 bearings, this version uses a 17.8mm inner diameter, making it a proprietary fit required for correct preload, smooth rotation, and long-term durability in DT Swiss front hub assemblies.

Using the correct DT Swiss–specified bearing is critical for hub performance and longevity—standard 6903 bearings will not substitute correctly.

Key Features & Benefits

• Genuine DT Swiss OEM bearing

• Special 17.8mm inner diameter (DT Swiss–specific)

• Designed specifically for DT Swiss 240s front hubs

• Smooth, low-friction rotation

• High-quality steel construction

• Exact factory dimensions for proper hub preload

Important Compatibility Notes

• This is NOT a standard 6903 bearing

• Must be used where a 17.8mm I.D. bearing is specified

• Replaces BB8307

• Using a standard 17mm or 18mm I.D. bearing may cause improper fit or hub damage

Compatibility

DT Swiss Front Hubs

• DT Swiss 240s Front Hub

Cross References

• Replaces: BB8307

• Keyword references: 18307

Technical Specifications

• Bearing Type: 6903 (DT Swiss Special)

• Inner Diameter (I.D.): 17.8 mm

• Outer Diameter (O.D.): 30 mm

• Thickness: 7 mm

• Material: Steel

• Application: Front hub bearing

What’s Included

• 1 × DT Swiss 6903 Special Bearing
  (Sold individually)

Ideal For

• DT Swiss 240s front hub service or rebuild

• Replacing worn or contaminated front hub bearings

• Restoring factory-correct hub performance

• Professional wheel service and home maintenance

A critical OEM bearing for proper DT Swiss 240s front hub function—don’t substitute, install the correct DT Swiss special bearing for smooth, long-lasting performance.