H&H Dual Tone 7 Speed Derailleur for Brompton Bicycle

2025 DT Rear Derailleur

A completely new design with the shift arm relocated to the front, preventing the arm end from contacting the cassette. Finished in DT’s signature two-tone color scheme.

The streamlined structure, combined with titanium bolts, reduces weight by 16 g compared to the previous version — approximately a 22% weight reduction.

Versions Available

• Fixed pulley version

• Adjustable pulley version

The adjustable pulley version is specifically designed for users experiencing significant pulley alignment issues.

Based on our experience:

• The fixed pulley version is more than sufficient for P Line / T Line rear triangles

• The C Line rear triangle has greater tolerance variation, where the adjustable version can be especially beneficial

Weight

• 72 g