Bianchi Zolder Pro GRX 600 11sp vs Sun Biscayne Tandem 7

Compare Specifications of Bianchi Zolder Pro GRX 600 11sp and Sun Biscayne Tandem 7

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Bianchi Zolder Pro GRX 600 11sp
Bianchi Zolder Pro GRX 600 11sp

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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 -- High Tensile Steel, TIG-Welded
Stem REPARTO CORSE 3D FORGED ALLOY 2014, RISE +/-8°, 1.1/8", EXT: 90MM-48/50CM, 100MM-52/54CM, 110MM-56CM, 120MM-58CM 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 REPARTO CORSE , FLAT TOP, ALLOY 6061 DIAM. 31,8MM, REACH 80MM, DROP 130MM, SIZE: 400MM-48/50CM, 420MM-52/56CM, 440MM-58CM 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 BIANCHI FULL CARBON 1.5"-1.1/8", DISC BRAKE FLAT MOUNT, THRU AXLE 12X100MM 1-1/8" High Tensile Steel, Curved Legs, Double Eyelets
Seatpost REPARTO CORSE CARBON UD SHAFT, FORGED ALLOY HEAD, DIAM 27.2MM, 15MM OFFSET, LEGNTH 350MM Alloy w/o Clamp, 25.6 x 350mm, Black
Grip CORK W/BIANCHI LOGO Foam, Black
Crankset SHIMANO GRX 600 FC-RX600 46X30T, CRANK LENGTH: 170MM-48/52CM, 172.5MM-54/58CM --
Pedals -- Slip Resistant Top, 9/16", Black
Chain SHIMANO CN-HG601-11, 11SP K.M.C. 1/2" x 3/32", Black (130 Links)
Shifters SHIMANO GRX 600 ST-RX600 2X11SP Shimano 7-Speed Revo Twist Shifter
Saddle SELLE ROYAL SETA S1, STEEL RAILS, 278X144MM Comfort Cruiser, Elastomer Suspension, Black
Headset FSA ORBIT C-40-ACB Steel, 25.4 x 34 x 30mm, Black
Derailleur Front SHIMANO GRX 810 FD-RX810 --
Derailleur Rear SHIMANO GRX 810 RD-RX810 SHADOW+ DESIGN 11SP 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
Sprocket SHIMANO 105 CS-R7000 11SP, 11-12-13-14-16-18-20-22-25-28-32T --
Bottom Bracket -- BC1.37'' x 24TPI, Steel, Caged Bearings
Spindle:Bolt Type, 119mm
Stand -- Alloy, Center Mount, Black
Tyres
Front VITTORIA TERRENO MIX TNT G+ 700X33 Beach Bum 26 x 2.125", Black Wall
Rear VITTORIA TERRENO MIX TNT G+ 700X33 Beach Bum 26 x 2.125", Black Wall
Wheel / RIM VISION TEAM 30 DISC 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)
Brakes
Front SHIMANO BR-RX400 Alloy (Linear Pull) Black
Rear -- Alloy (Linear Pull) Black
Brake Lever INCLUDED W/SHIFTERS Alloy (Linear Pull) Black / Silver
Suspension
Front -- --
Rear -- --
Colors Available
Colors Blue --


Physical Specs
Length -- --
Weight -- 27.2 kg
Overview
Features -- --
Additional Details SIZES : 480 500 520 540 560 580
BB : SHIMANO SM-BB72-41B
ROTOR : SHIMANO SM-RT70, DIAM. 160MM
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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