How to Adjust the Spring Tension on Shimano SPD-SL Pedals

I've been using Shimano SPD pedals for decades, but it never occurred to me that I could adjust the tension to make clipping in and out easier or harder. Today, I discovered a 2.5mm adjustment bolt on the top of the pedal. Turning this bolt clockwise increases the tension, while turning it counterclockwise decreases it. There's an indicator on the rear binding of each pedal.

As you turn the adjustment bolt, it clicks, changing the tension one step at a time, with four clicks per turn. This allows you to fine-tune the spring force to achieve the optimal cleat holding tension for releasing the cleats from the bindings. To ensure equal spring tension on both pedals, you can refer to the tension indicators and count the number of turns of the adjustment bolts.

The Shimano website provides further insights into the benefits of higher vs. lower tension settings:

Why Opt for More Spring Tension? 

A higher pedal spring tension will provide the most secure connection between your cleat and the SPD-SL pedal. This ensures maximum power transfer and a "locked-in" feel for aggressive and explosive riding. Think riders looking to get every iota of efficiency out of their bikes as they seek ultimate speed.

Keep in mind a higher spring tension will require better ankle mobility and strength to turn the foot and disengage from the pedal. More experienced riders who have lots of practice getting in and out of clipless pedals will often opt for this firmer spring tension.

Ultimately, you’ll most likely find the higher spring tension settings in WorldTour road races and the fastest local group rides. This is where the pros and racers prize absolute connectivity and efficiency above all else, especially during explosive power outputs. 

Why Opt for Less Spring Tension? 

A lower SPD-SL spring tension still provides a connected feel between rider and bike but allows for easier disengagement with less effort. These settings are perfect for those who are new to clipless technology or who are gaining confidence with clipping in and out.

The reduced effort to clip out means riders with less strength or mobility in their ankles will appreciate a lighter spring setting, even those with years of riding experience. Ultimately, this lower SPD-SL spring tension is well-suited for riders whose pedaling dynamics remain consistent without great bursts of power.  

The dealers manual for Shimano pedals includes a helpful graphic that clearly explains how the adjustment mechanism works.

Now that I'm up-to-date on pedal tension adjustments, I plan to follow Shimano's tips for shoe fitting and cleat placement.