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The Trek Fuel EX 8 GX, Specialized Stumpjumper Comp Alloy, and YT IZZO Comp are all full suspension trail bikes with high-end components. The Trek has 27.5″ / 29″ wheels, while the YT has a carbon frame.

Fuel EX 8 GX
Stumpjumper Comp Alloy
IZZO Comp
MSRP$3,799$3,400$2,999
Online Price
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CategoryTrailTrailTrail
Weight30.4 lbs / 13.8 kg28.9 lbs / 13.1 kg
FrameAluminumAluminumCarbon
ForkFox Rhythm Float 34
Fox Rhythm Float 34
Fox Rhythm Float 34
Wheel Size27.5″ / 29″29″29″
Wheel MaterialAluminumAluminumAluminum
Brake TypeHydraulic DiscHydraulic DiscHydraulic Disc
GroupsetGX Eagle, X1
NX Eagle
NX Eagle
Drivetrain1 × 121 × 121 × 12
Gear Range
Trek Fuel EX 8 GX
26 mph
Specialized Stumpjumper Comp Alloy
24 mph
YT IZZO Comp
25 mph
SuspensionFullFullFull
Front Travel140mm140mm130mm
Rear Travel130mm130mm130mm
SeatpostDropperDropperDropper
Brand Sitewww.trekbikes.comwww.specialized.comus.yt-industries.com
Suggested Bikes

Spec Level

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

Spec level →$0$500$1,000$1,500$2,000$2,500$3,000$3,500
Fuel EX 8 GX
Stumpjumper Comp Alloy
IZZO Comp

Geometry

Specs
Frame
Alpha Platinum Aluminum, tapered head tube, Knock Block, Control Freak internal routing, downtube guard, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130mm travel
Alloy chassis and rear-end, asymmetrical design, 29 Trail Geometry, horst pivot BB adjustment, threaded BB, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel
Fork
Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel
FOX FLOAT 34 Rhythm, GRIP damper, two position Sweep adjustment, 15x110mm QR axle, 44mm offset,140mm of travel
FOX 34 Float Rhythm 29" | 130 mm | 15QRx110 | 44 mm Rake
Rear Shock
Size: XS, S, Fox Performance Float EVOL, 3-position RE:aktiv damper, tuned by Trek Suspension Lab, 210mm x 52.5mm; Size: S, M, ML, L, XL, XXL, Fox Performance Float EVOL, 3-position RE:aktiv damper, tuned by Trek Suspension Lab, 210mm x 55mm
FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, S1:190x42.5mm, S2-S6: 190x45mm
FOX Float DPS Perf. Elite 210 x 55 mm | Remote
Bottom Bracket
SRAM DUB, 92mm, PressFit
SRAM DUB, BSA 73mm, Threaded
Headset
Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom
Acros AZX S - M AZX - 586 Block Lock | High Cap, L - XXL AZX - 576 | High Cap
Stem
Size: XS, S, Bontrager Line, 35mm, Knock Block, 0 degree, 40mm length; Size: M, ML, L, XL, XXL, Bontrager Line, 35mm, Knock Block, 0 degree, 50mm length
Alloy Trail Stem, 35mm bar bore
Race Face Aeffect S - M 50 mm Length / L - XXL 60 mm | 35 mm clamp
Handlebar
Size: XS, S, Bontrager Line, alloy, 35mm, 27.5mm rise, 750mm width; Size: M, ML, L, XL, XXL, Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width
Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 30mm rise, 800mm width
Race Face Aeffect 35 20 mm Rise | 760 mm Width
Saddle
Bontrager Arvada, hollow chromoly rails, 138mm width
Bridge Comp, Hollow Cr-mo rails, 155/143mm
SDG RADAR MNT YT Custom
Seatpost
Size: XS, S, Bontrager Line Dropper, 100mm travel, internal routing, 31.6mm, 345mm length; Size: M, ML, L, XL, XXL, Bontrager Line Dropper, 150mm travel, internal routing, 31.6mm, 440mm length
X-Fusion Manic, infinite adjustable, remote SRL LE lever, 34.9 (S1:100mm, S2: 125mm, S3: 150mm, S4/S5: 170mm, S6: 190mm)
YT Postman 31.6 mm | S 100 mm / M 125 mm / L 150 mm / XL - XXL 170 mm | Matchmaker Remote
Pedals
included / inklusive The included pedals were not made for demanding trails or racing. That is why we also offer you quality pedals at an attractive price in the shopping cart.
Grips
Bontrager XR Trail Elite, nylon lock-on
RockShox TwistLoc Sprint Remote
Groupset
Rear Derailleur
SRAM GX Eagle
SRAM NX Eagle, 12-speed
SRAM NX Eagle 12 - Speed
Crank
Size: XS, S, SRAM X1 Eagle, DUB, 30T steel ring, Boost (52mm chainline), 170mm length; Size: M, ML, L, XL, XXL, SRAM X1 Eagle, DUB, 30T steel ring, Boost (52mm chainline), 175mm length
SRAM NX Eagle, DUB, S1:165mm, S2-S5: 170mm, S6: 175mm, Steel, 30T
SRAM NX Eagle S 170 mm / M-XL 175 mm | 32T | DUB
Shifters
SRAM GX Eagle, 12 speed
SRAM NX Eagle, trigger, 12-speed
SRAM NX Eagle 12 - Speed
Cassette
SRAM Eagle XG-1275, 10-52, 12 speed
SRAM NX Eagle, 12-speed, 11-50t
SRAM PG1230 Eagle 11 - 50T | 12 - Speed
Chain
SRAM GX Eagle, 12 speed
SRAM NX Eagle, 12-speed
Brakes
SRAM G2 R 4-piston hydraulic disc
SRAM G2 R, 4-piston caliper, hydraulic disc, 200mm
SRAM G2 R Rotor CENTERLINE 200 mm / 180 mm
Wheels
Rims
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle
Roval 29, hookless alloy, 30mm inner width, tubeless ready
DT Swiss M 1900 Spline 29“ x 30 mm| 110 x 15 mm | 148 x 12 mm
Spokes
DT Swiss Industry
Front Hub
Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle
Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h
Rear Hub
Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h
Tires
Size: XS, S, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.40''; Size: XS, S, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.60''; Size: S, M, ML, L, XL, XXL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 29x2.40''; Size: S, M, ML, L, XL, XXL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 29x2.60''
Butcher, GRID casing, GRIPTON® compound, 29x2.3"
MAXXIS FORECASTER 29“ x 2.35 | EXO | TR
Disk Rotors
Size: XS, S, M, ML, L, XL, XXL, SRAM CenterLine, 6-bolt, round edge, 180mm; Size: M, ML, L, XL, XXL, SRAM CenterLine, 6-bolt, round edge, 200mm