Shimano's SPD-SLR Launches with Lower Stack and New Shoe Integration

Key points

• Shimano introduced the SPD-SLR system in September 2026, replacing the SPD-SL design used since 2003.
• The new Dura-Ace PD-R9300 and Ultegra PD-R8200 pedals offer a 12.5mm and 13.3mm stack height, respectively.
• SPD-SLR cleats weigh up to 22% less than SPD-SL equivalents, with the CL-SL120 model weighing 55g.
• The system is incompatible with existing SPD-SL pedals and cleats, requiring a full kit upgrade for optimal performance.
• New S-Phyre SH-RC910 and SH-RC810 shoes feature a Dynalast 2.0 fit and integrate fore-aft adjustment into the sole.

Background

Shimano's SPD-SL system has been the industry standard for road cycling since 2003, with minor updates over the years. The 2026 launch of SPD-SLR marks the first complete redesign of the core interface in over two decades. The system was previously teased in 2025 and caused a notable incident at the 2026 Paris-Roubaix, where Mathieu van der Poel could not clip into his teammate Jasper Philipsen's bike due to the incompatibility between the old SPD-SL and new prototype SPD-SLR pedals.

How outlets are covering it

road.cc emphasizes the technical improvements, including a 2.3mm reduction in stack height and a 10.5° engagement angle, while noting the lack of backward compatibility. Escape Collective highlights the marginal benefits of the update, questioning whether the 2.3mm reduction justifies the compatibility issues and the need for new shoes. bicycling.com frames the launch as a significant break from 23 years of compatibility, focusing on the 2.8mm stack reduction and the shift of fore-aft adjustment to the shoe. bikeradar.com provides a detailed comparison table, noting that while the new system is lighter and lower, the benefits are minimal for most riders, and it remains unclear if Shimano will fully phase out the SPD-SL system.

Why it matters

The launch of SPD-SLR signals a major shift in road cycling component design, prioritizing lower stack height and integrated shoe-pedal systems. The lack of backward compatibility forces riders to replace both pedals and cleats, potentially driving sales of new shoes and pedals. The system's performance gains, while marginal, may influence future designs from competitors like Q36.5 and SRM, which have already introduced low-stack alternatives.

What to watch

Shimano will likely continue to support the SPD-SL system with cleats and spare parts, but new high-end pedals and shoes will feature the SPD-SLR system. A full Dura-Ace R9300 and Ultegra R8200 groupset is expected to follow in 2027. Riders using existing SPD-SL shoes can use SPD-SLR cleats, but will not benefit from the full stack height reduction unless they upgrade to the new S-Phyre shoes.