Co-Motion Bluebird vs Polygon Strattos S2

Frame	Handbuilt frame with Co-Motion's zonally-butted cro-moly tubing	ALX All-Round, QRx130mm
Stem	Co-Motion handlebars & adjustable stoker stem	Entity OE Alloy, EXT: 90mm (XS, S, M) / 105mm (L, XL), BB: 31.8mm, R/D: 10degree
Handle Bar	--	Entity Sport Alloy, W: 400mm (XS, S, M) / 420mm (L, XL), BB: 31.8mm, R/D: 124mm, B/R: 80mm
Fork	Co-Motion Taper Gauge Tandem Touring fork w/ CNC Tandem Steerer	Light Weight Carbon Fork, Straight 1-1/8"
Seatpost	--	Entity Sport Alloy, 27.2 x 350mm
Crankset	--	Prowheel Ounce-421C-TT-N 50/34T
Pedals	--	Alloy Cage & Body w/ Reflector
Chain	--	KMC Z-8.3
Shifters	2 x 10-speed trigger shifters	Shimano Claris ST-R2000, 2x8-Speed Dual Control Lever
Saddle	Co-Motion 31.6 / Selle Italia Sportourer saddles	Entity, Steel Dia 7mm
Headset	FSA Orbit Z Internal	Zero Stack (ZS) Semi-Integrated Bearing for Straight Head Tube, ZS 44/28.6 | ZS 44/30, ID: 44mm
Derailleur Front	Shimano Deore	Alloy QRx100mm 32H
Derailleur Rear	Shimano Deore SGS	Shimano Claris RD-R2000-SS Direct Attach Alloy QRx130mm 32H
Cassette	11-34t cassette	Shimano CS-HG31 11-30T
Bottom Bracket	--	Prowheel BSA Threaded FOR 2-Piece Crankset

Front	Continental Ultrasport 700 x 32	Performance Tire 700C​
Rear	Continental Ultrasport 700 x 32	Performance Tire 700C​
Wheel / RIM	Co-Motion A-20 tandem hubs / Alex tandem rims	Alloy Double Wall 622-15 32H

Front	Avid BB5 w/ 200 mm Rotors / Tektro Eclipse Mtn levers	TEKTRO R315 Caliper
Rear	Avid BB5 w/ 200 mm Rotors / Tektro Eclipse Mtn levers	TEKTRO R315 Caliper
Brake Lever	--	Shimano Claris ST-R2000

Front	--	--
Rear	--	--

Colors

Medium Blue metallic

Blue Light Red

Length

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Features	- Co-Motion zonally-butted chromoly tubing - Proven Co-Motion touring geometry - Rack/ fender mounts	--
Additional Details	Drivetrain : Shimano 44/32t cranks Cockpit : FSA Omega stem	--