YBEKI 40T 42T 44T 46T 48T 50T 52T Round Bicycle Chainring, Narrow Width Chainrings 104 BCD for Road Bike Mountain BMX MTB

1.【Lab-Validated Biomechanical Oval Design】15% Pedaling Efficiency Boost – University of Colorado-proven ovality reduces knee strain by 18% and optimizes power output. Dual-Performance Modes – Race Mode (90+ RPM cadence) for sprints | Enduro Mode (60-80 RPM) for climbing torque. 12° Optimal Ovality – Ergonomic gear ratio adaptation throughout pedal strokes. Compatible with 104BCD Single Bike Chainring Shimano/SRAM 8-11 Speed MTB/Road Bikes  2.【Aerospace 7075-T6 Alloy & Military Durability】30% Stronger Than 6061 – 572MPa tensile strength handles extreme MTB/road cycling loads. 5-Axis CNC Precision – ±0.01mm tooth tolerance (ISO 13041 certified) ensures silent, seamless shifting. HV800 Hard Anodization – 3x wear resistance vs. standard chainrings, survives mud, rocks, and grit. 3.【DynamicChain 3.0 Anti-Drop System】Narrow-Wide Teeth (7.3mm/6.8mm) – 92% fewer chain drops on rough terrain (lab-tested). Dynamic Chamfer Technology – 45% faster chain engagement for instant power transfer. Extended Tooth Tips – Lock chains securely during high-impact jumps and drops. 4.【3D Ultra-Lightweight Performance Architecture】63% Lighter Than Steel – Hollow structure cuts weight without sacrificing strength. 98.7% Power Transfer Efficiency – Asymmetric ribs provide 155Nm/deg lateral stiffness. 1kg Total Bike Weight Reduction – Enhances climbing agility and acceleration. 5.【British Rider Guarantee】24-month promise - free replacement in the event of oxidation or non-human damage (industry-leading), Next-day replacement from Leeds warehouse, UK-based tech support (Mon-Fri 9am-9pm)