Product Info BL-M4100 Intuitive and powerful braking Quicker brake engagement with shorter free stroke Rider tunable and action-optimized cockpit High-performance brake control Additional contact point for a stiffer brake lever 10 deg. rotation angle setting range for I-SPEC EV shifting leverBR-MT420 90% braking power vs. BR-MT520 20% increase braking power vs. current 2-piston BR-MT400