Trek 820 vs Trek Domane AL 2 Gen 4

Load Carrying Capacity	Combined weight of bicycle, rider, and cargo of 300 pounds (136 kg)	125 kg (275 lb)
Frame	Trek Custom Steel, rack mounts, 135 x 5 mm QR	100 Series Alpha Aluminium, tapered head tube, internal routing, mudguard mounts, flat-mount disc, UDH, 142x12 mm thru axle
Stem	Size : XS - Bontrager alloy, 31.8 mm, Blendr compatible, 7 degree, 60 mm length Size : S - Bontrager alloy, 31.8 mm, Blendr compatible, 7 degree, 80 mm length Size : M/L, L - Bontrager alloy, 31.8 mm, Blendr compatible, 7 degree, 90 mm length Size : XL - Bontrager alloy, 31.8 mm clamp, Blendr compatible, 7 degree, 100 mm length	Size: 44 Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 70 mm length Size: 49 Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 80 mm length Size: 52, 54 Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 90 mm length Size: 56, 58 Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 100 mm length Size: 61 Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 110 mm length
Handle Bar	Size : XS, S - Bontrager alloy, 31.8 mm, 15 mm rise, 660 mm width Size : M/L, L, XL - Bontrager alloy, 31.8 mm, 15 mm rise, 690 mm width	Size: 44 Bontrager Comp, alloy, 31.8 mm, 80 mm reach, 121 mm drop, 36 cm control width, 40 cm drop width Size: 44, 49 Bontrager Comp VR-S, alloy, 31.8 mm, 81 mm reach, 118 mm drop, 38 cm width Size: 49 Bontrager Comp, alloy, 31.8 mm, 80 mm reach, 121 mm drop, 38 cm control width, 42 cm drop width Size: 52 Bontrager Comp, alloy, 31.8 mm, 80 mm reach, 121 mm drop, 40 cm control width, 44 cm drop width Size: 52 Bontrager Comp VR-S, alloy, 31.8 mm, 81 mm reach, 118 mm drop, 40 cm width Siz
Fork	SR Suntour M-3030, coil spring, 100 x 5 mm QR, 75 mm travel	Domane AL carbon, tapered carbon steerer, internal brake routing, fender mounts, flat mount disc, 12x100mm thru axle
Seatpost	Size : XS, S - Bontrager alloy, 29.2 mm, 12 mm offset, 300 mm length Size : M/L, L - Bontrager alloy, 29.2 mm, 12 mm offset, 330 mm length Size : XL - Bontrager alloy, 29.2 mm, 12 mm offset, 400 mm length	Size: 44, 49 Bontrager Comp, 6061 alloy, 27.2 mm, 8 mm offset, 250 mm length Size: 52, 54, 56, 58, 61 Bontrager Comp, 6061 alloy, 27.2 mm, 8 mm offset, 330 mm length
Grip	Bontrager SSR	Bontrager Supertack Perf tape
Crankset	Shimano Tourney TY301, 42/34/24, 170 mm length	Size: 44 Shimano RS200, 50/34 (compact), 165 mm length Size: 49, 52, 54 Shimano RS200, 50/34 (compact), 170 mm length Size: 56, 58, 61 Shimano RS200, 50/34 (compact), 175 mm length
Pedals	VP-536 nylon platform	--
Chain	KMC Z7, 7 speed	Shimano Sora HG71, 8 speed
Shifters	Shimano Tourney EF41, 7 speed	Shimano Claris ST-R2000-R, 8 speed, right Shimano Claris ST-R2000-L, 8 speed, left
Saddle	Bontrager Sport	Verse Short, steel rails, 145 mm width
Headset	1-1/8'' threadless	--
Derailleur Front	Shimano Tourney TY500, 31.8 mm clamp, top swing, dual pull	Shimano Claris R2000, 31.8 mm clamp
Derailleur Rear	Shimano Tourney TY300, long cage, 34T max cog	Shimano Claris R2000, medium cage, 34T max cog
Hub Front	Formula FM31 alloy, 7sp freewheel, 135 x 5 mm QR	Formula RX-512 alloy, 6-bolt, 100x12 mm thru axle
Hub Rear	Formula FM21 alloy, 100 x 5 mm QR	Formula RX-142 alloy, 6-bolt, Shimano 11-speed freehub, 142x12 mm thru axle
Spoke	Bontrager Approved	14 g stainless steel, black
Cassette	Shimano TZ500, 14-28, 7 speed	Shimano HG31, CS-HG31, 11-32, 8 speed
Chainrings	42 / 34 / 24	1x: 50T, 2x: 50/34
Bottom Bracket	--	Shimano UN300, 68 mm, threaded cartridge, 110 mm spindle

Front	Frame : 26 x 2.00" Fork : See manufacturer	Bontrager R1 Hard-Case Lite, wire bead, 60 tpi, 700x32 mm
Rear	Frame : 26 x 2.00" Fork : See manufacturer	Bontrager R1 Hard-Case Lite, wire bead, 60 tpi, 700x32 mm
Wheel / RIM	Bontrager AT-550, alloy, 36-hole, schrader valve	Bontrager Paradigm SL, Tubeless Ready, 24-hole, 21 mm width, Presta valve

Front	Tektro alloy linear-pull	Tektro C550 mechanical disc brake, dual piston, flat mount Tektro wave, 6-bolt, 160 mm
Rear	Tektro alloy linear-pull	Tektro C550 mechanical disc brake, dual piston, flat mount Tektro wave, 6-bolt, 160 mm

Front	--	--
Rear	--	--

Colors

Matte Trek Black

Crimson to Dark Carmine Fade Matte Lithium Grey

Length	--	--
Weight	15.28 kg	56 - 10.55 kg

Features	--	--
Additional Details	Max compatible fork travel : 75 mm	--