YBEKI 110 BCD Chainring 36T 38T 40T 42T 44T 46T 48T 50T 52T 54T 56T 58T Round Narrow Wide Single Chainwheel for 8 9 10 11 12 Speed Road Bike (black, 42T)

1.【Aircraft-Grade 7075-T6 Aluminum Construction】Precision-machined with 5-axis CNC (±0.01mm tooth tolerance) to ISO 13041 standards, 572MPa tensile strength - 30% stronger than 6061 aluminum chainrings, Military hard-anodized surface (HV800) survives 200hr salt spray testing, Patent-pending DuraLock coating resists UK road salt corrosion, Shimano 105/Ultegra & SRAM Force Compatible 2.【Narrow-Wide Chain Retention System】Alternating 7.3mm/6.8mm tooth profile reduces chain drops by 92%, Dynamic chamfer edges enable 45% faster chain engagement, Extended tooth tips maintain stability during 40°+ climbs (tested in Lake District) 3.【Pro-Level Weight Optimization】3D hollow structure weighs 280g less than steel equivalents, Asymmetric reinforcement ribs deliver 155Nm/deg stiffness, Mirror-polished teeth (0.09μ friction) save 15W at 90rpm 4.【All-UK Weather Performance】Self-cleaning grooves reduce mud buildup by 70% (Peak District tested), Dual coating options: Matte Black: Ceramic-coated for scratch resistance, Racing Red: UV-stable nano-dye won't fade, -20°C to 120°C operational range 5.【British Rider Guarantee】24-month crack warranty (industry-leading), Next-day replacement from Leeds warehouse, UK-based tech support (Mon-Fri 9am-9pm)