Shimano Saint Fc-M820 Crankset

Shimano Saint FC-M820 Crankset

The Shimano Saint FC-M820 is a gravity-focused crankset built with HollowTech II technology for aggressive downhill and freeride mountain biking. Engineered for extreme riding conditions, it combines stiffness and strength with reasonable weight through hollow aluminum construction and strategic reinforcement. Designed to withstand the impacts and torque demands of gravity riding where component failure can have serious consequences.

Key Features

• HollowTech II construction – Hollow aluminum crank arms with integrated spindle reduce weight while maintaining stiffness and strength through larger diameter tubing and strategic material placement
• Gravity riding reinforcement – Enhanced structural design in high-stress areas provides durability beyond standard cranksets, addressing the unique demands of downhill and freeride riding
• Multiple crank length options – Available in 165mm, 170mm, and 175mm to accommodate different rider heights, inseam lengths, and pedaling preferences
• 24mm spindle diameter – Oversized hollow spindle increases stiffness and power transfer while maintaining compatibility with standard external bearing bottom brackets
• 36T chainring included – Pre-installed chainring optimized for gravity riding gear ratios; single chainring setup reduces weight and eliminates front derailleur complexity

Technical Specifications

• Model: Shimano Saint FC-M820
• Type: 2-piece crankset (integrated spindle)
• Technology: HollowTech II
• Axle diameter: 24mm
• Available crank lengths: 165mm, 170mm, 175mm
• Bottom bracket shell: 68mm or 73mm (requires appropriate spacers)
• Bottom bracket standard: Euro (external bearing type)
• Chainring: 36T (included)
• Weight: 904g with chainring (170mm, manufacturer spec), 734g without chainring/hardware
• Intended use: Gravity, downhill, freeride

Compatibility and Ideal Use Cases

This crankset requires a frame with 68mm or 73mm bottom bracket shell width that accepts external bearing bottom brackets (Euro standard). The 24mm HollowTech II spindle requires a compatible Shimano external bearing bottom bracket (sold separately in most cases). Not compatible with square taper, ISIS, or other bottom bracket standards. The crankset is designed for single-chainring setups—riders wanting multiple chainrings should consider other options. Ideal for downhill mountain biking, freeride, and gravity-oriented disciplines where crankset strength and stiffness are critical for handling repeated impacts, hard landings, and high-torque pedaling situations. The 36T chainring suits gravity riding where climbing efficiency is less important than descending control and having appropriate gear ratios for technical terrain. Choose crank length based on rider height and preference: 165mm for shorter riders or those prioritizing ground clearance, 170mm for average heights, 175mm for taller riders or those wanting increased leverage.