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The Specialized Stumpjumper Comp Alloy, Trek Fuel EX 8 GX, 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. Explore the differences below.

2021 Specialized Stumpjumper Comp Alloy
2021 Trek Fuel EX 8 GX
2020 YT IZZO Comp
MSRP$3,500$3,899$2,999
Online Price
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CategoryTrailTrailTrail
Weight30.4 lbs28.9 lbs
FrameAluminumAluminumCarbon
ForkFox Rhythm Float 34
Fox Rhythm Float 34
Fox Rhythm Float 34
Wheel Size29″27.5″ / 29″29″
Wheel MaterialAluminumAluminumAluminum
Brake TypeHydraulic DiscHydraulic DiscHydraulic Disc
GroupsetNX Eagle
GX Eagle, X1
NX Eagle
Drivetrain1 × 121 × 121 × 12
Gear Range

Specialized Stumpjumper Comp Alloy

24 mph

Trek Fuel EX 8 GX

26 mph

YT IZZO Comp

25 mph
SuspensionFullFullFull
Front Travel140mm140mm130mm
Rear Travel130mm130mm130mm
SeatpostDropperDropperDropper
Brand Sitespecialized.comtrekbikes.comus.yt-industries.com
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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
Stumpjumper Comp Alloy
Fuel EX 8 GX
IZZO Comp

Geometry

Specs
Frame

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

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

Fork

FOX FLOAT 34 Rhythm, GRIP damper, two position Sweep adjustment, 15x110mm QR axle, 44mm offset,140mm of travel

Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel

FOX 34 Float Rhythm 29" | 130 mm | 15QRx110 | 44 mm Rake

Rear Shock

FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, S1:190x42.5mm, S2-S6: 190x45mm

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 Perf. Elite 210 x 55 mm | Remote

Bottom Bracket

SRAM DUB, BSA 73mm, Threaded

SRAM DUB, 92mm, PressFit

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

Alloy Trail Stem, 35mm bar bore

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

Race Face Aeffect S - M 50 mm Length / L - XXL 60 mm | 35 mm clamp

Handlebar

Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 30mm rise, 800mm width

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

Race Face Aeffect 35 20 mm Rise | 760 mm Width

Saddle

Bridge Comp, Hollow Cr-mo rails, 155/143mm

Bontrager Arvada, hollow chromoly rails, 138mm width

SDG RADAR MNT YT Custom

Seatpost

X-Fusion Manic, infinite adjustable, remote SRL LE lever, 34.9 (S1:100mm, S2: 125mm, S3: 150mm, S4/S5: 170mm, S6: 190mm)

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

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 NX Eagle, 12-speed

SRAM GX Eagle

SRAM NX Eagle 12 - Speed

Crank

SRAM NX Eagle, DUB, S1:165mm, S2-S5: 170mm, S6: 175mm, Steel, 30T

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 S 170 mm / M-XL 175 mm | 32T | DUB

Shifters

SRAM NX Eagle, trigger, 12-speed

SRAM GX Eagle, 12 speed

SRAM NX Eagle 12 - Speed

Cassette

SRAM NX Eagle, 12-speed, 11-50t

SRAM Eagle XG-1275, 10-52, 12 speed

SRAM PG1230 Eagle 11 - 50T | 12 - Speed

Chain

SRAM NX Eagle, 12-speed

SRAM GX Eagle, 12 speed

Brakes

SRAM G2 R, 4-piston caliper, hydraulic disc, 200mm

SRAM G2 R 4-piston hydraulic disc

SRAM G2 R Rotor CENTERLINE 200 mm / 180 mm

Wheels
Rims

Roval 29, hookless alloy, 30mm inner width, tubeless ready

Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle

DT Swiss M 1900 Spline 29“ x 30 mm| 110 x 15 mm | 148 x 12 mm

Spokes

DT Swiss Industry

DT Swiss Champion, J-Bend, Black

Front Hub

Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h

Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle

Rear Hub

Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h

Bontrager alloy, sealed bearing, 6-bolt, 108T Rapid Drive, SRAM XD driver, Boost148, 12mm thru axle

Tires

Butcher, GRID casing, GRIPTON® compound, 29x2.3"

Size: XS, S, M, ML, L, XL, XXL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29.x2.40''; 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 sidewalls, aramid bead, 120 tpi, 29x2.60''

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