BSC Tools

DAG Extension - 30mm

The BSC Tools DAG Extension - 30mm adds extra reach and flexibility to derailleur alignment work, giving mechanics and home tuners the clearance they need for precise adjustments. Whether refreshing an older Derailleur Alignment Gauge (DAG) or fine-tuning a modern setup, this extension helps ensure every shift clicks perfectly into place.

Designed for compatibility and convenience, the 30mm extension simply threads onto your existing DAG tool, extending its reach for frames or axles that are tricky to access. Stack multiple extensions together when more clearance is needed—ideal for working on bikes with wide dropout spacing or oversized hub systems.

• Extends DAG reach by 30mm for improved access and leverage
• Improves compatibility with older DAG tools lacking modern clearance
• Modular design allows multiple extensions to be combined for greater reach
• Durable shop-grade construction built for daily professional use

For professional mechanics and detail-oriented home riders alike, the BSC Tools DAG Extension keeps derailleur alignment accurate, efficient, and frustration-free.