Bicycle comparison

Specification	2027 Trek Fuel EX 9.8 Eagle 90	2025 Specialized Stumpjumper 15 Expert
Overview
Model year	2027	2025
Brand	Trek	Specialized
Model	Fuel EX 9.8 Eagle 90	Stumpjumper 15 Expert
Bicycle type	Mountain	Mountain
Archive ID	900000736	900001004
Original MSRP	$6,199.99	$5,999.99
Colors	Purple Phaze / Amethyst Marble; Gloss Dark Carmine / Matte Trek Black; Miami Green / Aloha Marble	Gloss Gunmetal / White Mountains; Satin Electric Green / Satin Forest Green
Sizes	S; M; L; XL; XXL	S1; S2; S3; S4; S5; S6
Frameset
Frame construction	OCLV Mountain Carbon, internal storage, ZS headset, adjustable leverage rate, guided internal routing, interchangeable alloy rocker link, interchangeable lower shock mount, downtube guard, shuttle guard, BSA 73, ISCG 05, ABP, UDH, Boost148, adaptable travel 145mm-160mm	FACT 11m carbon chassis and rear-end, Trail Geometry, SWAT™ Door integration, head tube angle adjustment, threaded BB, internal brake and dropper cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, SRAM UDH compatible, 145mm of travel
Frame material	Carbon fiber	Carbon Fiber
Fork	RockShox Lyrik Ultimate, DebonAir+ w/ ButterCups, Charger 3.1 RC damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 150mm travel	FOX FLOAT 36 Performance Elite, GRIP X2 damper, HS and LS rebound and compression adjustment, 15x110mm QR axle, 44mm offset, S1:140mm of travel, S2-S6:150mm of travel
Rear shock	RockShox Deluxe Ultimate RC2T, 205mm x 60mm	FOX FLOAT Performance Elite with Specialized GENIE Shock Tech, Ride Dynamics Trail Tune, 2-position lever w/3 setting Open mode tuning range, LSR adjustment, S1:210x52.5mm, S2-S6:210x55mm
Drivetrain
Component group	SRAM Eagle 90 T-Type, 12-speed	—
Rear derailleur	SRAM Eagle 90, T-Type	SRAM GX Eagle Transmission Derailleur
Crankset	S, M, L, XL, XXL: SRAM Eagle 90, DUB, 30T steel, T-Type, 55mm chainline, 170mm length / S, M, L, XL, XXL: SRAM Eagle 90, DUB, 30T steel, T-Type, 55mm chainline, 165mm length	SRAM GX Eagle Crankset, 32T ring, Integrated Guard, 55mm Chainline, S1-S3:165mm, S4-S6: 170mm
Bottom bracket	SRAM DUB MTB Wide, 73mm, BSA threaded	SRAM DUB, BSA 73mm Wide, Threaded
BB shell width	73 mm	73 mm
Cassette	SRAM Eagle XS-1275, T-Type, 10-52, 12 speed	SRAM GX Eagle Transmission Cassette, 12spd, 10-52t
Chain	SRAM GX Eagle, T-Type, 12 speed	SRAM GX Eagle Transmission Flattop Chain
Brakes
Brakes	SRAM Maven Bronze 4-piston hydraulic disc	(F) SRAM Maven Bronze, 4-piston caliper, hydraulic disc, 200mm HS2 Rotor / (R) SRAM Maven Bronze, 4-piston caliper, hydraulic disc, S1-S2: 180mm, S3-S6: 200mm HS2 Rotor
Cockpit & contact points
Headset	1-1/8'' threadless, sealed cartridge bearings	—
Handlebar	Race Face Turbine, alloy, 35mm, 40mm rise, 780mm width	Specialized, 6000 series alloy, 6-degree upsweep, 8-degree backsweep. S1-S2: 780 width, 20mm rise: S3-S4: 800 width, 30mm rise: S5-S6: 800 width, 40mm rise
Stem	Bontrager Elite, 35mm, 0 degree, 45mm length	Alloy Trail Stem, 35mm bar bore
Saddle	Verse Short Comp, steel rails, 145mm width	Bridge Comp, Hollow Cr-mo rails, S1-S2: 155mm, S3-S6: 143mm
Seatpost	S: Bontrager Line Dropper, 150mm travel, MaxFlow, internal routing, 34.9mm, 410mm length / M: Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length / L, XL, XXL: Bontrager Line Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 515mm length	PNW Loam Dropper, tool-less travel adjust, Range lever, 34.9, S1: 125mm, S2: 150mm, S3: 170mm, S4-S6: 200mm
Wheels & tires
Wheels	(F) Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29'' / (R) S: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD freehub, Boost148, 12mm thru axle, 27.5'' / M, L, XL, XXL: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD freehub, Boost148, 12mm thru axle, 29''	—
Front tire	S: Maxxis Minion DHR II, tubeless ready, 3C, EXO+ casing, MAXXTERRA, folding bead, 27.5x2.5'' / S, M, L, XL, XXL: Maxxis Minion DHF, tubeless ready, 3C, EXO+ casing, MAXXGRIP, folding bead, 29x2.5'' / M, L, XL, XXL: Maxxis Minion DHR II, tubeless ready, 3C, EXO+ casing, MAXXTERRA, folding bead, 29x2.5''	Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3"
Rear tire	S: Maxxis Minion DHR II, tubeless ready, 3C, EXO+ casing, MAXXTERRA, folding bead, 27.5x2.5'' / S, M, L, XL, XXL: Maxxis Minion DHF, tubeless ready, 3C, EXO+ casing, MAXXGRIP, folding bead, 29x2.5'' / M, L, XL, XXL: Maxxis Minion DHR II, tubeless ready, 3C, EXO+ casing, MAXXTERRA, folding bead, 29x2.5''	Eliminator, GRID TRAIL casing, GRIPTON® T7 compound, 2Bliss Ready, S1-S2: 27.5x2.3, S3- S6: 29x2.3"
Overview
Weight	—	14.47kg (31 lb, 14.4 oz)
Drivetrain
Shifters	—	SRAM AXS POD Controller
Wheels & tires
Hubs	—	(F) DT Swiss 370, 15x110mm, 28h / (R) DT Swiss 370, 12x148mm, 28h
Rims	—	Roval Traverse, hookless alloy, 30mm inner width, tubeless ready, Front: 29, Rear: S1-S2: 27.5, S3- S6: 29
Spokes	—	Sapim Force
Wheel size	—	29/27.5; 29/29

Specification

2027 Trek Fuel EX 9.8 Eagle 90

2025 Specialized Stumpjumper 15 Expert

Overview

Model year

2027

2025

Brand

Trek

Specialized

Model

Fuel EX 9.8 Eagle 90

Stumpjumper 15 Expert

Bicycle type

Mountain

Archive ID

900000736

900001004

Original MSRP

$6,199.99

$5,999.99

Colors

Purple Phaze / Amethyst Marble; Gloss Dark Carmine / Matte Trek Black; Miami Green / Aloha Marble

Gloss Gunmetal / White Mountains; Satin Electric Green / Satin Forest Green

Sizes

S; M; L; XL; XXL

S1; S2; S3; S4; S5; S6

Frameset

Frame construction

OCLV Mountain Carbon, internal storage, ZS headset, adjustable leverage rate, guided internal routing, interchangeable alloy rocker link, interchangeable lower shock mount, downtube guard, shuttle guard, BSA 73, ISCG 05, ABP, UDH, Boost148, adaptable travel 145mm-160mm

FACT 11m carbon chassis and rear-end, Trail Geometry, SWAT™ Door integration, head tube angle adjustment, threaded BB, internal brake and dropper cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, SRAM UDH compatible, 145mm of travel

Frame material

Carbon fiber

Carbon Fiber

Fork

RockShox Lyrik Ultimate, DebonAir+ w/ ButterCups, Charger 3.1 RC damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 150mm travel

FOX FLOAT 36 Performance Elite, GRIP X2 damper, HS and LS rebound and compression adjustment, 15x110mm QR axle, 44mm offset, S1:140mm of travel, S2-S6:150mm of travel

Rear shock

RockShox Deluxe Ultimate RC2T, 205mm x 60mm

FOX FLOAT Performance Elite with Specialized GENIE Shock Tech, Ride Dynamics Trail Tune, 2-position lever w/3 setting Open mode tuning range, LSR adjustment, S1:210x52.5mm, S2-S6:210x55mm

Drivetrain

Component group

SRAM Eagle 90 T-Type, 12-speed

—

Rear derailleur

SRAM Eagle 90, T-Type

SRAM GX Eagle Transmission Derailleur

Crankset

S, M, L, XL, XXL: SRAM Eagle 90, DUB, 30T steel, T-Type, 55mm chainline, 170mm length / S, M, L, XL, XXL: SRAM Eagle 90, DUB, 30T steel, T-Type, 55mm chainline, 165mm length

SRAM GX Eagle Crankset, 32T ring, Integrated Guard, 55mm Chainline, S1-S3:165mm, S4-S6: 170mm

Bottom bracket

SRAM DUB MTB Wide, 73mm, BSA threaded

SRAM DUB, BSA 73mm Wide, Threaded

BB shell width

73 mm

Cassette

SRAM Eagle XS-1275, T-Type, 10-52, 12 speed

SRAM GX Eagle Transmission Cassette, 12spd, 10-52t

Chain

SRAM GX Eagle, T-Type, 12 speed

SRAM GX Eagle Transmission Flattop Chain

Brakes

SRAM Maven Bronze 4-piston hydraulic disc

(F) SRAM Maven Bronze, 4-piston caliper, hydraulic disc, 200mm HS2 Rotor / (R) SRAM Maven Bronze, 4-piston caliper, hydraulic disc, S1-S2: 180mm, S3-S6: 200mm HS2 Rotor

Cockpit & contact points

Headset

1-1/8'' threadless, sealed cartridge bearings

—

Handlebar

Race Face Turbine, alloy, 35mm, 40mm rise, 780mm width

Specialized, 6000 series alloy, 6-degree upsweep, 8-degree backsweep. S1-S2: 780 width, 20mm rise: S3-S4: 800 width, 30mm rise: S5-S6: 800 width, 40mm rise

Stem

Bontrager Elite, 35mm, 0 degree, 45mm length

Alloy Trail Stem, 35mm bar bore

Saddle

Verse Short Comp, steel rails, 145mm width

Bridge Comp, Hollow Cr-mo rails, S1-S2: 155mm, S3-S6: 143mm

Seatpost

S: Bontrager Line Dropper, 150mm travel, MaxFlow, internal routing, 34.9mm, 410mm length / M: Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length / L, XL, XXL: Bontrager Line Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 515mm length

PNW Loam Dropper, tool-less travel adjust, Range lever, 34.9, S1: 125mm, S2: 150mm, S3: 170mm, S4-S6: 200mm

Wheels & tires

Wheels

(F) Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29'' / (R) S: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD freehub, Boost148, 12mm thru axle, 27.5'' / M, L, XL, XXL: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD freehub, Boost148, 12mm thru axle, 29''

—

Front tire

S: Maxxis Minion DHR II, tubeless ready, 3C, EXO+ casing, MAXXTERRA, folding bead, 27.5x2.5'' / S, M, L, XL, XXL: Maxxis Minion DHF, tubeless ready, 3C, EXO+ casing, MAXXGRIP, folding bead, 29x2.5'' / M, L, XL, XXL: Maxxis Minion DHR II, tubeless ready, 3C, EXO+ casing, MAXXTERRA, folding bead, 29x2.5''

Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3"

Rear tire

Eliminator, GRID TRAIL casing, GRIPTON® T7 compound, 2Bliss Ready, S1-S2: 27.5x2.3, S3- S6: 29x2.3"

Overview

Weight

—

14.47kg (31 lb, 14.4 oz)

Drivetrain

Shifters

—

SRAM AXS POD Controller

Wheels & tires

Hubs

—

(F) DT Swiss 370, 15x110mm, 28h / (R) DT Swiss 370, 12x148mm, 28h

Rims

—

Roval Traverse, hookless alloy, 30mm inner width, tubeless ready, Front: 29, Rear: S1-S2: 27.5, S3- S6: 29

Spokes

—

Sapim Force

Wheel size

—

29/27.5; 29/29

Geometry comparison

One selected size or frame position per bicycle, matching the comparison dropdown choices used when Print / PDF was opened.

Measurement	2027 Trek Fuel EX 9.8 Eagle 90	2025 Specialized Stumpjumper 15 Expert
Selected size / position	19.5" (L)	S3
Reach	485 mm	450 mm
Stack	638 mm	627 mm
Effective top tube	617 mm	595 mm
Head-tube angle	64.5°	64.5°
Seat-tube angle	77.4°	77°
Actual seat-tube angle	72.6°	—
Seat tube	420 mm	405 mm
Head tube	125 mm	110 mm
Chainstay / rear center	442 mm	435 mm
Wheelbase	1262 mm	1213 mm
Bottom-bracket drop	35 mm	38 mm
Bottom-bracket height	339 mm	337 mm
Standover height	749 mm	745 mm
Fork offset / rake	44 mm	44 mm
Front center	822 mm	780 mm
Trail	129 mm	130 mm
Wheel size	29"	—

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 23, 2026.