Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2 vs Sun Biscayne Tandem 7

Compare Specifications of Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2 and Sun Biscayne Tandem 7

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Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2
Specialized S-Works Tarmac SL8 - Shimano Dura-Ace Di2

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Sun Biscayne Tandem 7
Sun Biscayne Tandem 7

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Technical Specifications
Drivetrain -- K.M.C. 1/2" x 1/8", Black (152 Links)
Frame S-Works Tarmac SL8 FACT 12r Carbon, Rider First Engineered™, Win Tunnel Engineered, Clean Routing, Threaded BB, 12x142mm thru-axle, flat-mount disc High Tensile Steel, TIG-Welded
Stem Roval Rapide Cockpit, Integrated Bar/Stem Alloy, 25.4 x 180mm Quill x 80mm Ext. x 25.4 Clamp, Black
Stoker Stem:Alloy, Adjustable Reach (4-Bolt Face) Black
Handle Bar Roval Rapide Cockpit, Integrated Bar/Stem Steel, 28.4" Wide x 7.3" Rise x 25.4 Clamp, Black
Stoker Handlebar: Steel, 27" Wide x 10.8" Rise x 25.4mm Clamp, Black
Fork -- 1-1/8" High Tensile Steel, Curved Legs, Double Eyelets
Seatpost S-Works Tarmac SL8 Carbon seat post, FACT Carbon, 15mm offset Alloy w/o Clamp, 25.6 x 350mm, Black
Grip Supacaz Super Sticky Kush Foam, Black
Crankset Shimano Dura-Ace R9200, HollowTech II, 12-speed with 4iiii Precision Pro dual-sided powermeter --
Pedals -- Slip Resistant Top, 9/16", Black
Chain Shimano Dura-Ace, 12-speed K.M.C. 1/2" x 3/32", Black (130 Links)
Shifters -- Shimano 7-Speed Revo Twist Shifter
Saddle Body Geometry S-Works Power, carbon fiber rails, carbon fiber base Comfort Cruiser, Elastomer Suspension, Black
Headset -- Steel, 25.4 x 34 x 30mm, Black
Derailleur Front Shimano Dura-Ace R9250, braze-on --
Derailleur Rear Shimano Dura-Ace R9250, 12-speed Shimano RD-TX35 Tourney
Hub Front -- Alloy, 36H x 14G with 3/8" Bolt-On Axle, Black (For Freewheel)
Hub Rear -- Alloy, 36H x 14G x 3/8" Bolt-On Axle, Black
Spoke -- 14G Stainless Steel with Brass Nipples
Cassette Shimano Dura-Ace, 12-speed, 11-30t --
Chainrings 52/36T --
Bottom Bracket Shimano Dura-Ace, BB-R9200 BC1.37'' x 24TPI, Steel, Caged Bearings
Spindle:Bolt Type, 119mm
Stand -- Alloy, Center Mount, Black
Tyres
Front S-Works Turbo Rapidair 2BR, 700x26mm Beach Bum 26 x 2.125", Black Wall
Rear S-Works Turbo Rapidair 2BR, 700x26mm Beach Bum 26 x 2.125", Black Wall
Wheel / RIM Front: Roval Rapide CLX II, Tubeless, 21mm internal width carbon rim, 51mm depth, Win Tunnel Engineered, Roval AFD hub, 18h, DT Swiss Aerolite spokes
Rear: Roval Rapide CLX II, Tubeless, 21mm internal width carbon rim, 60mm depth, Win Tunnel Engineered, Roval AFD hub, 24h, DT Swiss Aerolite spokes
Rims:26" x 36H x 14G, Red
Front: 26" x 1.75 x 36H x 14G Alloy-Cruiser, Bolt-On
Rear: 26" x 1.75 x 36H x 14G Alloy-Cruiser, (FOR FREEWHEEL)
Tube Turbo Ultralight, 60mm Front, 80mm Rear, Presta valve --
Brakes
Front Shimano Dura-Ace R9270, hydraulic disc Alloy (Linear Pull) Black
Rear Shimano Dura-Ace R9270, hydraulic disc Alloy (Linear Pull) Black
Brake Lever Shimano Dura-Ace R9270, hydraulic disc Alloy (Linear Pull) Black / Silver
Suspension
Front S-Works FACT 12r Carbon, 12x100mm thru-axle, flat-mount disc --
Rear -- --
Colors Available
Colors Satin Fog Tint / Green Ghost Pearl / Red Ghost Pearl Fade
Satin Carbon / Viavi Cynan Blue / Viavi Silver-Blue Pearl Fade / Gloss Metallic White Silver
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Physical Specs
Length -- --
Weight 6.62 kg 27.2 kg
Overview
Features -- --
Additional Details -- Captain Crank Left: 3-Piece Alloy, 170mm x 42T x 1/2" x 1/8", Black (For Diamond Square Cranks)
Captain Crank Right: 3-Piece Alloy, 170mm, Black (For Diamond Square Cranks)
Freewheel: Shimano TZ-21 (7-Speed) 14-28T
Captain Crank Right: 3-Piece Alloy, 170mm, Black (For Diamond Square Cranks)
Stoker Crank Left: 3-Piece Alloy, 170mm x 42T x 1/2" x 1/8", Black (For Diamond Square Cranks)
Stoker Crank Right: 3-Piece Alloy, 170mm x 42T x 1/2" x 3/32", Black (For Diamond Square Cranks)
Chainwheel: Steel, Silver Painted W/Plastic Chain Cover
Pulley Adjuster:Eccentric BB Insert
Seat Clamp: Alloy, 28.6mm I.D., with Double Bolt, Black
Stoker Seat Clamp: Alloy, 34.9mm I.D., Black
Front Fender: Steel, W/Single Strut, Painted
Rear Fender: Steel, W/Single Strut, Painted
Fender Set: Plastic, F&R W/Rubber Bump Guards, Silver

Which one do you think is better? And why?
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