The new Ritchey Road Logic Disc delivers the same amazing ride experience that the bike is known for but adds the stopping power and control of disc brakes.
The tried and true specs on the frame remain unchanged but now sport a redesigned chainstay for flat-mount disc brake compatibility, thru-axles in the front and rear and a new fork designed specifically for the Road Logic Disc.

Frame - Road Logic Disc
Material: heat-treated, triple-butted Ritchey Logic steel tubing - TIG welded
Ultra-light forged and machined straight 1-1/8" headtube
WCS headset included (upper IS42/28.6 - 16mm stack height | lower IS42/30)
142mm spacing (12mm alloy thru-axle included)
Replaceable stainless-steel derailleur hanger
27.2mm seat tube with integrated seat collar (max torque setting: 6Nm)
Front derailleur clamp size: 28.6mm (max torque setting: 2.5Nm) - not included
Bottom bracket: 68mm - English threaded
Can accommodate 1X or 2X chainrings
Crankset min/max ring size - single: 36 to 50t / double: 46/30t to 53/39t
External cable routing
Bottle mounts: 2
Fork
Ritchey WCS Carbon Disc Road Fork included
1-1/8" straight steerer with integrated 45-degree crown race 
100mm spacing (12mm alloy thru-axle included)
Steerer length: 300mm
Axle-crown: 371mm
Rake/Offset: 46mm
Tire Compatibility
Wheel and tire compatibility: 700 x 30c tire clearance (depending on tire/rim manufacturer)
Frame max spacing: 39mm
Fork max spacing: 40mm
Brake Compatibility
Flat-mount brakes front and rear: 140mm (160mm max - adaptors available separately)
Frame flat-mount bracket height: 10mm