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650b? Here is what you need to know about this wheel size: http://www.bikepacking.com/gear/650b
Frame and Fork
The Felt Breed 30 frame is constructed of butted, hydro-formed aluminum tubing. The fork is carbon fiber.
The bottom bracket is the newest standard 86.5mm design with sealed cartridge bearings maximum durability.
Shifter cables are full length housing routed internally, as is the hydraulic brake line to the rear brake. The aluminum steerer tube is tapered, with a 1.125″ bearing at the top and a 1.5″ bearing at the bottom to maximize lateral stiffness.
The seatstays on the frame surround the outside of the seat tube instead of just attaching directly behind the seatpost, a design that slightly reduces frame stiffness felt by the rider.
The bike will feel more compliant and smoother, particularly over rough surfaces, because of it.
Drivetrain and Brakes
The drivetrain and brake systems on the Felt Breed 30 are a mix of Shimano's new GRX gravel specific groupsets. 11 speed GRX 600 (105 equivalent) shifters, GRX 800 (Ultegra level) Derailleur and GRX 400 (Tiagra level) flat mount hydraulic brakes.
Braking on the bike once the pads have been bedded in is very strong with minimal lever effort and very good modulation. There simply is no substitute for Shimano's hydraulic disc brake.
The crankset is GRX 600 single speed with a 40T chainring and the cassette range is 11-42 with 11 speeds.
Wheels and Contact Points
The remainder of the components on the Devox by Felt. The seatpost is carbon fiber, to dampen shock and vibration. The stem and handlebars are aluminum.
The wheels are Devox tubeless ready 650b with 24 spokes front and rear and centerlock brake rotor mounts for Shimano rotors.
Tires are 650x47 Vittoria Terreno Dry and the saddle is from Pro Logo NDR T4.0.
The Felt Breed series are true gravel bikes, capable of being ridden harder than any 700c gravel bikes we've seen.
They demonstrate that 650b is the right wheel size for gravel bikes that are being used primarily or exclusively off pavement.
If you are looking for a more versatile bike, something better suited for multi-purpose and multi-surface riding - take a look at Felt's new Broam series as well as Jamis' acclaimed Renegade series gravel/adventure bikes.