Bike Comparison
    MSRP
    $2,800$2,199$2,299
    Where to Buy
    $2,800

    At Specialized

    $1

    At

    $2,299

    At Biloxi Bicycle Works

    $2,299

    At Jenson USA

    Category
    TrailEnduroTrail
    Weight
    35.1 lbs33.5 lbs
    4.9
    5.0
    4.8
    AluminumAluminumAluminum
    Fork
    RockShox 35 SilverFox Rhythm Float 34Marzocchi Bomber Z2
    Shock
    X-FusionFox Float DPS Performance
    Wheels
    AluminumAluminumAluminum
    29″27.5″ / 29″29″
    Brakes
    Hydraulic DiscHydraulic DiscHydraulic Disc
    Groupset
    SX EagleSLX, ShimanoDeore, FSA
    Drivetrain
    1 × 121 × 121 × 12
    Suspension
    FullFullFull
    Front Travel
    140mm150mm140mm
    Rear Travel
    130mm150mm130mm
    Brand Site

    specialized.com

    polygonbikes.com

    marinbikes.com

    Summary
    The Specialized Stumpjumper Alloy, Polygon SISKIU T8, and Marin Rift Zone 29" 2 are all aluminum frame full suspension mountain bikes. The Stumpjumper Alloy has better components, while the SISKIU T8 has 27.5″ / 29″ aluminum wheels and more travel.
    Similar Bikes
    Accessories
    Ride Feel

    Based on frame geometry and build specs.

    Terrain
    easyextreme
    Handling
    nimblestable
    2023 Stumpjumper Alloy
    2022 SISKIU T8
    2023 Rift Zone 29" 2
    Other Trail 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)

    24 mph

    2023 Stumpjumper Alloy

    25 mph

    2022 SISKIU T8

    25 mph

    2023 Rift Zone 29" 2

    Highest gear

    (descending)

    Spec Level

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

    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

    BB StandardBSA, 73mm, Threaded

    Hanger StandardUDH

    ColorSatin Redwood / Rusted Red

    aluminum

    BB StandardBSA, 73mm, Threaded

    Hanger StandardUDH

    ColorSatin Redwood / Rusted Red

    All New Series 3 6061 Aluminum, 29” Wheels, 130mm Travel, MultiTrac Suspension Platform, 148x12mm Boost Thru-Axle, 73mm Threaded BB w/ ISCG05 Tabs

    BB StandardBSA, 73mm, Threaded

    Hanger StandardUDH

    ColorSatin Redwood / Rusted Red

    Fork

    RockShox 35 Silver, Solo Air, 44mm offset, rebound adjust, TurnKey lockout, 15x110mm Boost™ Maxle® Lite thru-axle, 140mm of travel

    Travel150mm

    Spring TypeAir

    FOX 34 RHYTHM 150mm (27.5") / 140mm (29") TRAVEL

    Travel150mm

    Spring TypeAir

    Marzocchi Bomber Z2 29", Rail Damper with Sweep Adjustment, 140mm Travel, Kabolt Bolt-On Axle, 44mm Offset

    Travel150mm

    Spring TypeAir

    Shock

    X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout S1:190x42.5mm, S2-S6: 190x45mm

    Travel130mm

    Spring TypeAir

    FOX FLOAT DPS SPECIAL TUNING E2E:210X55MM, HARDWARE:8MMX25MM

    Travel130mm

    Spring TypeAir

    Travel130mm

    Spring TypeAir

    Bottom Bracket

    SRAM Powerspline

    SHIMANO 2-PIECE CRANKSET BSA THREADED

    External Sealed Cartridge Bearing

    Headset

    ZERO STACK (ZS) SEALED BEARING FOR TAPER HEAD TUBE, ZS 44/28.6 | ZS 56/40

    FSA No 57E, Semi-Sealed Cartridge Bearings, 1 1/8" x 1 1/2”

    Stem

    Alloy Trail Stem, 35mm bar bore

    ENTITY XPERT, ALLOY E:35MM R:7DEG BB:35MM

    Marin 3D Forged Alloy, 35mm

    Handlebar

    Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 30mm rise, 780mm width

    ENTITY XPERT, ALLOY W:780MM R:20MM BB:35MM

    Marin Mini-Riser, 6061 Double Butted Aluminum, 780mm Width, 28mm Rise, 5º Up, 9º Back

    Saddle

    Body Geometry Bridge Saddle, steel rails

    ENTITY XTENT

    Marin Speed Concept

    Seatpost

    TranzX dropper, 34.9mm, S1: 100mm, S2: 125mm, S3: 150mm. S4-S5: 170mm, S6- 200mm

    TRANZ-X 150MM (S-M) 170 (L-XL) TRAVEL, ZERO OFFSET, 30.9MM

    TranzX, YSP18JL, 1x Remote, Size S 150mm Travel, All Other Sizes 170mm Travel, 30.9mm

    Pedals

    ALLOY FLAT PEDAL W / REPLACEABLE PIN & REFLECTOR

    -

    Grips

    Specialized Trail Grips

    Marin Grizzly Lock On

    Groupset
    Rear Derailleur

    SRAM SX Eagle, 12-speed

    SHIMANO SLX RD-M7100-SGS DIRECT ATTACH

    Shimano Deore, 12-Speed, SGS

    Front Derailleur

    -

    Crank

    SRAM SX Eagle, S1:165mm, S2-S5: 170mm, S6: 175mm, 30T

    SHIMANO MT-510-1 BOOST 32T

    FSA Comet, Modular 1x, 32T Direct Mount Chainring, MegaTooth Technology, Boost Spacing

    Shifters

    SRAM SX Eagle, trigger, 12-speed

    SHIMANO SLX SL-M7100-R, 1x12-SPEED TRIGGER

    Shimano Deore, 12-Speed, SL-M6100-R

    Cassette

    SRAM PG-1210 Eagle, 11-50t

    12 SPEED 11-51T

    SunRace 12-speed, 11-51

    Chain

    SRAM SX Eagle, 12-speed

    KMC X12 12SPEED

    KMC X-12 Silver and Black

    Brakes

    Front: Tektro Gemini Comp, hydraulic disc, resin pad, 200mm, Rear: Tektro Gemini Comp, hydraulic disc, resin pad, 180mm

    TEKTRO HD-M745 4-PISTONS HYDRAULIC DISC BRAKES

    Hydraulic Disc

    Brake Levers

    Tektro HDM-535

    Wheels
    Rims

    Double-wall alloy, 27mm internal width, 28h

    584 / 622-35 32H FOR TYRE 584 / 622-54/76 TUBELESS READY

    Marin, Double Wall Alloy, 29mm Inner, Pinned Joint, Disc Specific, 32H, Tubeless Compatible

    Spokes

    Stainless, 14g

    Front Hub

    Specialized alloy front hub disc, sealed cardridge bearings, 6-bolt, 15x110mm thru-axle, 28h

    Shimano HB-MT410, Thru Axle 15x110mm 32h, Center-Lock

    Forged Alloy, 110x15mm, Disc, 32H

    Rear Hub

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

    Shimano FB-MT410, Thru Axle 12x148mm 32h, Center-Lock, Microspline Hub

    Forged Aluminum, 148x12mm, Centerlock Disc, 32H

    Tires

    Front: Butcher, GRID casing, GRIPTON® T7 compound, 29x2.3", Rear: Purgatory, GRID casing, GRIPTON® T7 compound, 29x2.3"

    PERFORMANCE TIRE, 27.5”X2.40” / 29”X2.40”

    Vee Tire Co. Flow Snap 29x2.35", Tackee Compound, Tubeless Ready

    Disc Rotors

    SHIMANO SM-RT54 180mm CENTER-LOCK

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