Crossover from crossing to tilted vortex phase in Bi2Sr2CaCu2O8+δ single crystals near ab-plane

► The resistivity measurements were performed on the high-quality Bi-2212 single crystals. ► Mixed vortex chains + vortex lattice phase and the tilted vortex lattice were recognized. ► The sharp crossover separates strong pinning phase and weak pinning phase.