Shimano 105 Crank Arm

Generally, this 105 left crank arm is designed for the 105 series, but it is often compatible with other Shimano Hollowtech II road cranksets that share the same spline interface. However, you should verify that your current crankset uses the same interface to ensure a secure fit.

HOLLOWTECH II technology uses a hollow crank arm design to reduce weight while maintaining high rigidity. This helps improve power transfer from your legs to the drivetrain, making your pedaling more efficient.

While it is physically possible to install a different length crank arm, it is not recommended. Using crank arms of different lengths will create an uneven pedal stroke, which can lead to biomechanical issues and discomfort during your ride.

Yes, you will need a Shimano crank installation tool (often called a preload tool) to tighten the plastic cap, and a standard hex key (usually 5mm) to tighten the two pinch bolts on the side of the crank arm.

This left crank arm typically includes the necessary pinch bolts pre-installed, but it does not include the plastic preload cap or the bottom bracket itself. You will need to reuse your existing preload cap or purchase a new one if yours is damaged.