Eagle 90 T-TypeFull Mount Design (UDH frame required) T Type compatibility Most robust mechanical derailleur Replaceable skid plates, outer and inner parallelogram link, cage or cage assembly The most rebuildable derailleur in the Eagle Transmission Ecosystem T Type cable actuation ratio SRAM Model ID: RD 90 A1 Attributes Maximum Cog 52T Minimum Cog 10T Primary Color Black RD Capacity 42T Speed 12 Mount Full Mount (UDH)