The Box Two cassette was where Prime 9 started. Originally conceived as an E-MTB product to deliver long service life and extra range over fewer gears, we quickly grew to enjoy its abilities on unpowered MTBs.
 

• Cogs Pinned to Lightweight Spiders
• Ultra-Wide Ratio with Consistent Progression
• Prime 9 Technology
• Box's Most Durable Cassette
• Compatible with HG Freehub Bodies