Trek Madone SL 6 vs Trek Session 8 29 GX

Load Carrying Capacity	Combined weight of bicycle, rider, and cargo of 275 pounds (125 kg)	Combined weight of bicycle, rider, and cargo of 300 pounds (136 kg)
Frame	500 Series OCLV Carbon, KVF (Kammtail Virtual Foil) tube shape, adjustable top tube IsoSpeed, invisible cable routing, 3S aero chain keeper, flat mount disc, Duo Trap S compatible, 142 x 12 mm thru axle	Alpha Platinum Aluminum, high main pivot, idler pulley, integrated frame protection, internal or external routing, magnesium rocker link, Mino Link, ISCG 05 2-bolt mount, Active Braking Pivot, 157 x 12 mm thru axle, 200 mm travel
Stem	Size : 50 - Bontrager Pro, 31.8 mm, Blendr compatible, 7 degree, 80 mm length Size : 52, 54 - Bontrager Pro, 31.8 mm, Blendr compatible, 7 degree, 90 mm length Size : 56, 58 - Bontrager Pro, 31.8 mm, Blendr compatible, 7 degree, 100 mm length Size : 60, 62 - Bontrager Pro, 31.8 mm, Blendr compatible, 7 degree, 110 mm length	Bontrager Line Pro, 35 mm, Direct Mount, 50 mm length
Handle Bar	Size : 50, 52 - Bontrager Elite Aero VR-CF, alloy, 31.8 mm, invisible cable routing, 93 mm reach, 123 mm drop, 40cm width Size : 54, 56 - Bontrager Elite Aero VR-CF, alloy, 31.8 mm, invisible cable routing, 93 mm reach, 123 mm drop, 42cm width Size : 58, 60, 62 - Bontrager Elite Aero VR-CF, alloy, 31.8 mm, invisible cable routing, 93 mm reach, 123 mm drop, 44cm width	Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width
Fork	Madone KVF full carbon, tapered carbon steerer, invisible cable routing, flat mount disc, carbon dropouts, 12 x 100 mm thru axle	RockShox Boxxer Select, DebonAir spring, Charger RC damper, 46 mm offset, 20 x 110 mm Boost thru axle, 200 mm travel
Seatpost	Size : 50, 52, 54, 56 - Madone aero carbon internal seatmast cap, integrated light mount, 25 mm offset, short length Size : 58, 60, 62 - Madone aero carbon internal seatmast cap, integrated light mount, 25 mm offset, tall length	Bontrager Rhythm Elite, 31.6 mm, 0 mm offset, 330 mm length
Grip	Bontrager tape	Bontrager XR Trail Elite, nylon lock-on
Crankset	Size : 50, 52 - Shimano Ultegra R8000, 50/34 (compact), 170 mm length Size : 54, 56 - Shimano Ultegra R8000, 50/34 (compact), 172.5 mm length Size : 58, 60, 62 - Shimano Ultegra R8000, 50/34 (compact), 175 mm length	Truvativ Descendant DH, DUB 83, 34T steel ring, 165 mm length
Pedals	--	Wellgo BO-87B, alloy body, Cro-Mo axle, replaceable pins
Chain	Shimano Ultegra HG701, 11-speed	SRAM PC-1110, 11 speed
Shifters	Shimano Ultegra R8020, 11-speed	SRAM GX DH, 7 speed
Saddle	Bontrager Aeolus Comp, steel rails, 145 mm width	Bontrager Arvada, hollow chromoly rails, 138 mm width
Headset	Madone integrated, stainless cartridge bearings, sealed, 1-3/8 top, 1.5 bottom	--
Derailleur Front	Shimano Ultegra R8000, braze-on	--
Derailleur Rear	Shimano Ultegra R8000, short cage, 30T max cog	SRAM GX DH, medium cage
Cassette	Shimano Ultegra R8000, 11-30, 11 speed	SRAM PG-720, 11-25, 7 speed
Chainrings	50 / 34	--
Bottom Bracket	Trek BB90	SRAM DUB, 83 mm, BSA threaded

Front	Bontrager R3 Hard-Case Lite, aramid bead, 120 tpi, 700 x 25c	Bontrager G5 Team Issue, wire bead, 2-ply 60tpi, 29 x 2.50''
Rear	Bontrager R3 Hard-Case Lite, aramid bead, 120 tpi, 700 x 25c	Bontrager G5 Team Issue, wire bead, 2-ply 60tpi, 29 x 2.50''
Wheel / RIM	Front : Bontrager Aeolus Comp, Tubeless Ready, 18 mm rim width, 100 x 12 mm thru axle Rear : Bontrager Aeolus Comp Disc, Tubeless Ready, 18 mm rim width, 142 x 12 mm thru axle	Front : Bontrager Line DH 30, Tubeless Ready, 6-bolt, 110 x 20 mm Boost thru axle Rear : Bontrager Line DH 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano 7 speed freehub, 157 x 12 mm thru axle

Front	Shimano Ultegra hydraulic disc, flat mount Brake Rotor : Shimano RT800, centerlock, 160 mm	SRAM Code R 4-piston hydraulic disc Brake Rotor : SRAM CenterLine, 6-bolt, round edge, 180 mm
Rear	Shimano Ultegra hydraulic disc, flat mount Brake Rotor : Shimano RT800, centerlock, 160 mm	SRAM Code R 4-piston hydraulic disc Brake Rotor : SRAM CenterLine, 6-bolt, round edge, 200 mm

Front	--	--
Rear	--	--

Colors

Black/Quicksilver Radioactive Red/Trek Black

Satin Trek Black

Length	--	--
Weight	8.62 kg	17.68 kg

Features	- 500 Series OCLV - KVF Tube Shape - Madone IsoSpeed Decoupler	- Rock the mullet - Active Braking Pivot - Suspension Calculator
Additional Details	--	Shock : Size : R1 - Fox VAN Performance, 400lb spring, 250 x 72.5 mm Size : R2 - Fox VAN Performance, 450lb spring, 250 x 72.5 mm Size : R3 - Fox VAN Performance, 500lb spring, 250 x 72.5 mm