Author Ultrasonic 27.5 2021-22 vs Co-Motion Bluebird

Compare Specifications of Author Ultrasonic 27.5 2021-22 and Co-Motion Bluebird

Selected Bikes

Author Ultrasonic 27.5 2021-22
Author Ultrasonic 27.5 2021-22

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Co-Motion Bluebird
Co-Motion Bluebird

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Model:

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Technical Specifications
Speed 11 --
Frame Triple butted hydroformed alloy 6061 27.5" Handbuilt frame with Co-Motion's zonally-butted cro-moly tubing
Stem AUTHOR alloy Co-Motion handlebars & adjustable stoker stem
Handle Bar AUTHOR Flat Top bar 9° 620 / 640 mm --
Fork Front : RST F1RST 27.5 air, lock out (80 mm) Co-Motion Taper Gauge Tandem Touring fork w/ CNC Tandem Steerer
Seatpost AUTHOR alloy (31.6) --
Grip AUTHOR kratton rubber --
Pedals Alloy --
Chain KMC X11 --
Shifters SHIMANO SLX (11) 2 x 10-speed trigger shifters
Saddle AUTHOR Champion Author Navigator Co-Motion 31.6 / Selle Italia Sportourer saddles
Headset -- FSA Orbit Z Internal
Derailleur Front -- Shimano Deore
Derailleur Rear SHIMANO SLX Shimano Deore SGS
Hub Front AUTHOR Xenon 32 holes --
Spoke Black stainless steel 2.0 mm --
Cassette -- 11-34t cassette
Bottom Bracket PROWHEL BB unit --
Tyres
Front CST B-Trail aramid 27.5" × 2.25" Continental Ultrasport 700 x 32
Rear CST B-Trail aramid 27.5" × 2.25" Continental Ultrasport 700 x 32
Wheel / RIM Rims :AUTHOR Xenon TRC 27.5 32 holes Co-Motion A-20 tandem hubs / Alex tandem rims
Brakes
Front TEKTRO Gemini disc hydraulic (6" rotors) Avid BB5 w/ 200 mm Rotors / Tektro Eclipse Mtn levers
Rear TEKTRO Gemini disc hydraulic (6" rotors) Avid BB5 w/ 200 mm Rotors / Tektro Eclipse Mtn levers
Brake Lever TEKTRO Gemini WS --
Suspension
Front -- --
Rear -- --
Colors Available
Colors -- Medium Blue metallic


Physical Specs
Length -- --
Weight 12 kg --
Overview
Features -- - Co-Motion zonally-butted chromoly tubing
- Proven Co-Motion touring geometry
- Rack/ fender mounts
Additional Details SIZE :14", 16"
HEAD PARTS: AUTHOR Integrated 1.5" tapered
CHAIN WHEEL : PROWHEEL 32 teeth 165 / 170 mm cranks
Drivetrain : Shimano 44/32t cranks
Cockpit : FSA Omega stem

Which one do you think is better? And why?
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