Compare: 2019 Trek Session 8 27.5 vs Session 9.9 29

Overview
Ride Feel
Gearing
Spec Level
Geometry
Specs

Bike Comparison

Only show differences

	Session 8 27.52019 Trek	Session 9.9 292019 Trek

MSRP	$4,729	$8,399
Where to Buy	— $1 At	— $1 At
Category	Downhill	Downhill
Weight	37.5 lbs	34.5 lbs
	8.0	8.7
Frame	Aluminum	Carbon
Fork	RockShox BoXXer	Fox Factory Float 40
Wheels	Aluminum	Aluminum
Wheel Size	27.5″	29″
Brakes	Hydraulic Disc	Hydraulic Disc
Groupset	GX, MRP	Saint, MRP
Drivetrain	1 × 7	1 × 10
Suspension	Full	Full
Front Travel	200mm	190mm
Rear Travel	210mm	190mm
Brand Site	trekbikes.com	trekbikes.com
Summary	The Trek Session 8 27.5 and Trek Session 9.9 29 are both full suspension downhill bikes. The Session 8 27.5 has an aluminum frame, 27.5″ aluminum wheels, and more travel; while the Session 9.9 29 has a carbon frame, 29″ aluminum wheels, better components, and higher gearing.

Similar Bikes

Accessories

Ride Feel

Based on frame geometry and build specs.

Terrain

easyextreme

Handling

nimblestable

Session 8 27.5

Session 9.9 29

Other Downhill bikes

Gear Range

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

27 mph

Session 8 27.5

28 mph

Session 9.9 29

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Geometry

Specs

	Session 8 27.52019 Trek	Session 9.9 292019 Trek

Frame	Alpha Platinum Aluminum, ABP, Full Floater, EVO Link, tapered head tube, Mino Link, integrated frame protection, internal control routing, MicroTruss, down tube guard, ISCG Mount, 210mm travel	OCLV Mountain Carbon main frame & stays, ABP, magnesium EVO Link, tapered head tube, Mino Link, integrated frame protection, Control Freak internal routing, Carbon Armor, ISCG mount, 190mm travel
Fork	RockShox BoXXer RC Air, low speed compression, internal preload, Motion Control IS, 20mm Maxle DH, 200mm travel Travel: 190mm Spring Type: Air	Fox Factory 40 FIT Grip2, air spring, Kashima Coat, hi/lo speed compression, Boost 110x20 thru axle, 190mm travel Travel: 190mm Spring Type: Air
Bottom Bracket	SRAM GXP TM, 83mm	Shimano SM-BB80, 83mm
Headset	FSA Orbit, sealed cartridge bearing, 1-1/8˝ top, 1.5˝ bottom	FSA Orbit, sealed cartridge bearing, 1-1/8˝ top, 1.5˝ bottom (includes geometry adjust angled cups)
Stem	Bontrager Line Pro Direct Mount, 35mm clamp, 50mm length	Bontrager Line Pro Direct Mount, 35mm clamp, 50mm length
Handlebar	Bontrager Line, 35mm, 27.5mm rise, 780 width	Bontrager Line Pro, OCLV Carbon, 35mm, 15mm rise, 820mm width
Saddle	Bontrager Arvada, hollow chromoly rails	Bontrager Arvada, austenite rails
Seatpost	Bontrager Rhythm Elite, 31.6mm, 0mm offset	Bontrager Rhythm Elite, 31.6mm, 0mm offset
Pedals	Wellgo BO-87B, alloy body, Cro-Mo axle, replaceable pins	Wellgo MG-1, magnesium body, Cro-Mo axle, replaceable pins
Grips	Bontrager XR Trail Elite, alloy lock-on	Bontrager XR Trail Elite, alloy lock-on

Groupset

Rear Derailleur	SRAM GX DH, Roller Bearing Clutch	Shimano Saint M820, Shadow Plus
Crank	Truvativ Descendant, 36T w/MRP G4 chainguide	Shimano Saint M825, 36T w/MRP G4 carbon chainguide
Shifters	SRAM GX DH, 7 speed	Shimano Saint, 10 speed
Cassette	SRAM PG-720, 11-25, 7 speed	Shimano CS-5700, 11-25, 10 speed
Chain	SRAM PC-1110	KMC X10
Brakes	SRAM Guide R hydraulic disc	Shimano Saint M820 hydraulic disc

Wheels

Rims	Bontrager Line DH 30, Tubeless Ready, Boost 110x20 front, 157x12 rear w/7 speed DH freehub	Bontrager Line DH 30, Tubeless Ready, Boost 110x20 front, 157x12 rear w/7 speed DH freehub
Tires	Bontrager G4 Team Issue, 27.5x2.35˝	Bontrager G5 Team Issue, wire bead, 29x2.50˝

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