Jamis Ventura A1 vs Viathon G.1 GRX 800

Drivetrain	--	Shimano GRX 800 1X11 drivetrain
Frame	Size Specific Design double-butted 6061 aluminum compact sloping top tube frame design with with redesigned rear triangle, SST tubing diameters and internal cable guides, 1 1.5 - 1 1/8” tapered head tube, butted seat tube for 27.2 seat post, flat mount disc brake mount, replaceable derailleur hanger and fender/rack eyelets	VIATHON G.1 GRAVEL FRAME
Stem	Ritchey 4-Axis, 3D forged 6061 alloy, 6˚ x 90mm (48/51), 100mm (54/56), 120mm (58/61)	ZIPP SERVICE COURSE SL B1 31.8 MM, 6°, 110 MM
Handle Bar	Ritchey Logic, 6061 aluminum, 31.8 x 400mm (48/51) 420mm (54/56), 440mm (58/61)	ZIPP SERVICE COURSE SL-70
Fork	Jamis Performance ECO carbon composite with carbon steerer, 1.5” hollow formed crown, monocoque one-piece forming technology, carbon dropouts with stainless tabs, flat mount disc brake mount with internal cable routing, exposed fender eyelets	VIATHON G.1 GRAVEL FORK
Seatpost	Ritchey Road, 27.2 x 350mm with alloy clamp	ZIPP SERVICE COURSE SL C1, 27.2 MM, 400 MM
Crankset	FSA Vero, 50/34T, 170mm (48/51), 172.5mm (54/56), 175mm (58/61)	SHIMANO GRX 800 FC-RX810-1, HOLLOWTECH 2, 42T
Pedals	Touring platform style, full alloy with toe clips	--
Chain	KMC Z9	SHIMANO CN-HG701-11, 11-SPEED
Shifters	Shiftlevers : Shimano Sora ST-R3000 Dual Control STI, 18-speed	SHIMANO GRX 800 BR-RX810, DISC BRAKE
Gear	--	46T 1x or 50/34T 2x gearing
Saddle	Selle Royal Asphalt with integrated clip system	SELLE ITALIA NOVUS BOOST MAG
Headset	FSA Integrated, threadless, 1.5 - 1 1/8”	--
Derailleur Front	Sora FD-R3000 with 31.8mm alloy clamp	--
Derailleur Rear	Shimano Sora RD-R3000	SHIMANO GRX 800 RD-RX812, 11-SPEED, SHADOW
Cassette	Shimano HG201 9-speed, 11-32T	SHIMANO XT CS-M8000, 11-SPEED, 11-42T
Bottom Bracket	FSA sealed cartridge, 68 x 110.5mm	SHIMANO SM-BBR60

Front	Vittoria Zaffiro, 700 x 28c	IRC BOKEN, 700 X 40, FOLDING
Rear	Vittoria Zaffiro, 700 x 28c	IRC BOKEN, 700 X 40, FOLDING
Wheel / RIM	Alex ATD 470 disc specific rims with TCS (Tubeless Compatible System), 32H, Joytec 6-bolt alloy hubs with QR and 14g stainless steel spokes	MERCURY G1C DISC, CENTER LOCK, SHIMANO 11-SPEED

Front	Tektro Lyra mechanical disc brake	SHIMANO SM-RT800, 160 MM, W/LOCK RING
Rear	Tektro Lyra mechanical disc brakes	SHIMANO SM-RT800, 160 MM, W/LOCK RING
Brake Lever	Shimano Sora ST-R3000 STI levers	SHIMANO GRX 800 BR-RX810, DISC BRAKE

Front	--	--
Rear	--	--

Colors

Ink

Copper Silver Silver

Length

--

--

Features	--	- Drop seat stays and flattened rear tubing mute road chatter - Internal cable routings resist dust and grime - Durable threaded bottom bracket adds serviceability - Nimble and wide Mercury G1C carbon disc brake wheels for max tire contact - Zipp handlebars for steering control and comfort - Mounts for three water bottles
Additional Details	Tape : Jamis suede tape with gel Sizes : 48, 51, 54, 56, 58, 61cm	Sizes : 52, 54, 56, 58, 60 Front Hub Axle : SHIMANO E-THRU AXLE 100X12MM Rear Axle : SHIMANO E-THRU AXLE 142X12MM Inner Tubes : KENDA 700C Bar Tape : FIZIK BLACK