Product Description For Road and Time Trial: the Pro Road chainring from FSA The FSA Pro Road chainring is ideal for racing and time trial riders. The aluminum chainring is CNC-machined and has a bolt circle diameter of 130 mm. Specifications:Application:Road, Triathlon & Time TrialMount:130 mm bolt circle diameter, 5-armTeeth:38 T, 48 TGearing:2x10-speed, 2x11-speed (38 T only)Technical Information:Material:aluminum (7075-T6)Features:CNC manufacturedModels:black 38-tooth: Type:WB015-38TManufacturer Number:370-0138 black 42-tooth: sold out Type:WB008-42TManufacturer Number:370-0142 black 44-tooth: sold out Type:WB031-44TManufacturer Number:370-0144 black 48-tooth: Type:WA143-48TManufacturer Number:370-0148 black 50-tooth: sold out Type:WA142-50TManufacturer Number:370-0150Contents:1 x FSA 5-Arm Pro Road chainring Manufacturer: F.S.A. S.R.L. Via Francesco Petrarca. 4 20123 Milan Italy info@fullspeedahead.com