Bike Comparison
 |  |  |
| MSRP | $2,800 | $2,599 | $2,399 |
|---|---|---|---|
| Spec Level | |||
| Where to Buy | — $1 At | — $1 At | — $1 At |
| Category | Trail | Enduro | Trail |
| Weight | 33.5 lbs | ||
| Frame | Aluminum | Aluminum | Aluminum |
| Fork | RockShox 35 Silver | Fox Rhythm Float 34 | Marzocchi Bomber Z2 |
| Wheels | Aluminum | Aluminum | Aluminum |
| Wheel Size | 29″ | 27.5″ / 29″ | 29″ |
| Brakes | Hydraulic Disc | Hydraulic Disc | Hydraulic Disc |
| Groupset | SX Eagle | SLX, Shimano | Deore, FSA |
| Drivetrain | 1 × 12 | 1 × 12 | 1 × 12 |
| Suspension | Full | Full | Full |
| Front Travel | 140mm | 150mm | 140mm |
| Rear Travel | 130mm | 150mm | 130mm |
| Seatpost | Dropper | Dropper | Dropper |
| 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, the SISKIU T8 has 27.5″ / 29″ aluminum wheels and more travel, and the Rift Zone 29" 2 has higher gearing. | ||
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Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more. Learn more →
Specialized Stumpjumper Alloy
Polygon SISKIU T8
Marin Rift Zone 29" 2
| 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 | aluminum | All New Series 3 6061 Aluminum, 29” Wheels, 130mm Travel, MultiTrac Suspension Platform, 148x12mm Boost Thru-Axle, 73mm Threaded BB w/ ISCG05 Tabs |
|---|---|---|---|
| Fork | RockShox 35 Silver, Solo Air, 44mm offset, rebound adjust, TurnKey lockout, 15x110mm Boost™ Maxle® Lite thru-axle, 140mm of travel | FOX 34 RHYTHM 150mm (27.5") / 140mm (29") TRAVEL | Marzocchi Bomber Z2 29", Rail Damper with Sweep Adjustment, 140mm Travel, Kabolt Bolt-On Axle, 44mm Offset |
| Rear Shock | X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout S1:190x42.5mm, S2-S6: 190x45mm | FOX FLOAT DPS SPECIAL TUNING E2E:210X55MM, HARDWARE:8MMX25MM | |
| 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 with Pins | - | |
| Grips | Marin Grizzly Lock On |
| 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 | Tektro Gemini Comp, hydraulic disc, resin pad, 200mm | TEKTRO HD-M745 4-PISTONS HYDRAULIC DISC BRAKES | Hydraulic Disc |
| Brake Levers | Tektro HDM-535 |
| 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 | Alloy, sealed cartridge bearings, 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 |
| Disk Rotors | SHIMANO SM-RT54 180mm CENTER-LOCK |