The Shimano FH-RM30-7S freehub body is an original replacement part designed exclusively to restore the performance of Shimano FH-RM30 7-speed rear hubs. Manufactured in high-strength steel, this complete cassette body guarantees exceptional durability and smooth transmission for your daily commutes as well as your demanding mountain bike rides.

Technical Summary

This freehub body is specifically machined for Hyperglide 7-speed cassettes. With its weight of 133 grams, it offers an excellent compromise between lightness and robustness. Installation is carried out using a 10 mm Allen key, ensuring safe and stable assembly. The design includes an integrated right dust cap that protects the internal mechanisms against dirt and moisture infiltration, thus extending the hub's lifespan.

Technical Highlights

• Exclusive compatibility: Designed only for Shimano FH-RM30-7S rear hubs — NOT suitable for 8-speed versions (FH-RM30-8).
• High-strength steel: Robust construction offering excellent resistance to wear and repeated mechanical stress.
• Precise engagement: 15-tooth splines machined with precision for instant, play-free power transfer.
• Reinforced sealing: Right dust cap provided to protect bearings and pawl mechanism.
• Simplified installation: Direct replacement without modification, accessible to amateur and experienced mechanics alike.

Geometry and Standards

The body dimensions are optimized for the Hyperglide 7-speed standard: body length of 32 mm, diameter of 36.6 mm and internal diameter of 14.1 mm. The total length reaches 38.1 mm. This cassette body is exclusively designed for quick release (QR) axles and can only be mounted on original Shimano FH-RM30 7-speed hubs.

Maintenance and Replacement

This original Shimano replacement part is ideal for restoring a worn hub or repairing a damaged cassette body. Signs of replacement include: excessive body play, difficulty engaging gears, abnormal noises during freewheeling or visible spline wear. Regular replacement helps maintain smooth and reliable transmission, while preserving cassette integrity.

Use and Applications

• MTB and off-road bikes: Resistance to harsh conditions (mud, dust, impacts).
• Touring and trekking bikes: Long-distance reliability with 7-speed transmission.
• Urban and city bikes: Durability for intensive daily use.
• Restoration and maintenance: Original Shimano part guaranteeing compatibility and quality.

Contents and Installation

The cassette body is delivered complete with right dust cap. Please note: the body fixing bolt and washer are not included — they must be reused from the old body or ordered separately. Installation requires partial hub disassembly (removal of axle, locknut and cone) and controlled tightening of the fixing bolt with a 10 mm Allen key.