Shimano ZEE FC-M640 Mountain Bike Crankset 175mm

Shimano ZEE FC-M645/M640 Crankset: Built for Enduro Dominance

Conquer technical climbs and charge through demanding trails with the uncompromising strength of Shimano’s ZEE crankset. Engineered specifically for aggressive mountain biking, this complete package (including SM-BB52 bottom bracket) delivers legendary Shimano reliability where it matters most.

Why Riders Choose ZEE:
– Unmatched Stiffness: A reinforced steel axle provides 30% greater rigidity versus standard Trail cranks, translating every watt of your power directly to the trail—no flex, no wasted energy on steep climbs or explosive sprints.
– Bombproof Construction: Thick-walled aluminum arms withstand brutal impacts, while hardened steel pedal inserts ensure your pedals stay securely anchored through rock gardens and harsh landings.
– Complete Hollowtech II System: Features seamless integration with Shimano’s proven 24mm spindle design for smooth rotation, easy maintenance, and consistent performance in muddy or dusty conditions.

Perfect For: Enduro racers, aggressive trail riders, and downhill enthusiasts seeking maximum durability and power transfer on challenging terrain. The single 36T chainring (104mm BCD) simplifies your 10-speed drivetrain, reducing weight and eliminating front derailleur hassles.

Key Specs & Compatibility:
| Feature | ZEE Crankset | Typical Trail Crank |
|——————|———————|———————|
| Axle Stiffness | +30% Reinforced | Standard |
| Bottom Bracket | Included (SM-BB52) | Often Sold Separately |
| BB Shell Width | 68mm or 73mm | Limited Options |
| Weight | 906g | Heavier Alternatives|

Ready to install with English-thread bottom brackets (68/73mm), 175mm crank arms, and 9/16″ pedal compatibility. Experience precise control and relentless durability—engineered for riders who push limits in black diamond terrain or all-day backcountry epics.

Optimized for 10-speed mountain drivetrains. Color: Sleek Black.