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SHIMANO Midsole Technology

Designing a midsole that also connects to the leather upper helps keep riders’ feet closer to the sole.
This minimizes stack height, improves fit, and keeps the foot securely in place while pedaling.
It also reduces power loss and prevents fault-induced failure.

Seamless midsole structure

Lower stack height stabilizes pedaling strokes and maximizes efficiency.

SHIMANO engineers and researchers discovered reducing stack height, the distance between the sole and pedal axis, stabilizes pedaling strokes and increases power transmission efficiency. A lower stack height is especially important when applying high levels of downward force on the pedals.
SHIMANOs mid to high-end RC shoes and TR501 Triathlon shoes now share the same S-PHYRE seamless midsole structure first introduced in their pro-level RC9 series shoes.


On-road shoes: Stack height

Shoes Sole thickness (mm) Midsole Structure
Sole bottom to Upper inside
SPD-SL RC902 4.9 X
RC902T 4.9 X
RC702 5.5 X
RC502 6.5 X
RC300 6.5 X
RC100 10.0  
TR901 6.6  
TR501 6.5 X