2026 Specialized Stumpjumper 15 Alloy - FOX Coil
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Stumpjumper 15 Alloy
Trail · 145mm · M5 Alloy · Mixed Wheels · FOX Coil
The Stumpjumper 15 Alloy brings the same adjustable trail geometry and six-way geo adjustability as the carbon models to an M5 alloy chassis — at the most accessible price in the Stumpy 15 lineup. Factory coil suspension front and rear delivers consistent, plush trail feel without air spring complexity.
- FOX FLOAT 38 Factory GRIP X2: 160mm — same Kashima Factory fork as carbon Pro model.
- FOX DHX Factory Coil Rear: 145mm, Ride Dynamics trail tune, spring rates matched per size.
- Shimano SLX M7100: 12-speed mechanical — reliable, durable, no batteries needed.
- Mixed Wheels: 29" front / 27.5" rear — nimble and playful for technical terrain.
- Roval Traverse Alloy + DT 370: Hookless alloy rims, 30mm inner width, durable hubs.
- TRP DH-R EVO Brakes: 220mm front / 203mm rear, 4-piston — powerful DH-level stopping power.
- 16.90kg (37 lb): Heaviest Stumpy 15, but most affordable — same geometry and adjustability.
The most accessible Stumpy 15 — alloy frame, Factory coil suspension, mechanical SLX drivetrain. Same trail geometry, same adjustability.
FOX FLOAT 38 Factory GRIP X2
160mm travel, HS and LS rebound and compression adjustment, 15x110mm QR axle, Kashima-coated stanchions. Same Factory fork as the Pro carbon build.
FOX DHX Factory Coil Rear
Ride Dynamics Trail Tune, 210x55mm. Spring rates: S2: 400lbs, S3: 450lbs, S4: 500lbs, S5: 550lbs, S6: 600lbs. Consistent coil feel, no air spring tuning.
Shimano SLX M7100 12-Speed
Mechanical 12-speed, 10-51t cassette. Reliable, durable, no batteries — the workhorse drivetrain.
Mixed Wheel Setup
29" front / 27.5" rear — nimble, responsive, playful. Geometry unaffected by wheel size choice.
TRP DH-R EVO Brakes
4-piston calipers, 220mm front / 203mm rear. DH-level power and modulation at an accessible price.
M5 Alloy Frame + SWAT
M5 Alloy chassis with six-way geometry adjustability. SWAT downtube storage. Lifetime pivot bearing replacement.
| S2 | S3 | S4 | S5 | S6 | |
|---|---|---|---|---|---|
| Crank Length | 165 | 165 | 170 | 170 | 170 |
| Handlebar Width | 810 | 810 | 810 | 810 | 810 |
| Stem Length | 35 | 35 | 35 | 35 | 35 |
| Saddle Width | 155 | 143 | 143 | 143 | 143 |
| Seatpost Length | 150 | 170 | 200 | 200 | 200 |
| Stack | 621 | 630 | 644 | 657 | 671 |
| Reach | 420 | 445 | 470 | 495 | 525 |
| Headtube Length | 100 | 110 | 125 | 140 | 155 |
| Headtube Angle | 64° | 64° | 64° | 64° | 64° |
| BB Height | 340 | 340 | 340 | 340 | 340 |
| BB Drop | 35 | 35 | 35 | 35 | 35 |
| Trail | 134 | 134 | 134 | 134 | 134 |
| Fork Length (full) | 573 | 573 | 573 | 573 | 573 |
| Fork Rake/Offset | 44 | 44 | 44 | 44 | 44 |
| Front Center | 755 | 785 | 816 | 848 | 884 |
| Chainstay Length | 432 | 432 | 432 | 442 | 442 |
| Wheelbase | 1186 | 1216 | 1247 | 1288 | 1325 |
| Top-tube Length | 574 | 596 | 625 | 649 | 678 |
| Bike Standover Height | 751 | 745 | 745 | 745 | 751 |
| Seat Tube Length | 385 | 405 | 425 | 445 | 465 |
| Seat Tube Angle | 76.5° | 76.5° | 76° | 76° | 76° |
| Max Seatpost Insertion | 245 | 255 | 255 | 285 | 285 |
| Min Seatpost Insertion | 80 | 80 | 80 | 80 | 80 |
Frameset
Frame
M5 Alloy chassis and rear-end, Trail Geometry, SWAT Door integration, head tube angle adjustment, threaded BB, internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, SRAM UDH compatible, 145mm travel
Seat Binder
Alloy, 38.6mm
SWAT
SWAT internal downtube storage
Suspension
Fork
FOX FLOAT 38 Factory, GRIP X2 damper, HS and LS rebound and compression adjustment, 15x110mm QR axle, 44mm offset, 160mm travel
Rear Shock
FOX DHX Factory, Ride Dynamics Trail Tune, 210x55mm. S2: 400lbs, S3: 450lbs, S4: 500lbs, S5: 550lbs, S6: 600lbs
Brakes
Front Brake
TRP DH-R EVO, 4-piston caliper, hydraulic disc, 220mm rotor
Rear Brake
TRP DH-R EVO, 4-piston caliper, hydraulic disc, 203mm rotor
Drivetrain
Shift Levers
Shimano SLX M7100, 12-speed
Rear Derailleur
Shimano SLX M7100, SGS, 12-speed
Cassette
Shimano SLX CS-M7100, 12-speed, 10-51t
Chain
Shimano SLX M7100, 12-speed
Crankset
Shimano SLX M7120, 32T ring, 55mm chainline. S2-S3: 165mm, S4-S6: 170mm
Bottom Bracket
Shimano BB-MT801, Threaded
Wheels & Tires
Front Wheel
Roval Traverse 29", hookless alloy, 30mm inner width, DT Swiss 370, 15x110mm, 28h, Sapim Force spokes
Rear Wheel
Roval Traverse 27.5", hookless alloy, 30mm inner width, DT Swiss 370, 12x148mm, 32h, Sapim Force spokes
Front Tire
Butcher, GRID TRAIL casing, GRIPTON T9 compound, 2Bliss Ready, 29x2.3"
Rear Tire
Eliminator, GRID GRAVITY casing, GRIPTON T9/T7 compound, 2Bliss Ready, 27.5x2.3"
Inner Tubes
Standard, Presta valve
Cockpit
Handlebars
Deity Racepoint, 5° upsweep, 9° backsweep. S2: 810mm, 25mm rise; S3-S6: 810mm, 38mm rise
Stem
Deity, 35mm clamp, 35mm length
Seatpost
PNW Loam OE Dropper, tool-less travel adjust, Range lever. S2: 150mm, S3: 170mm, S4-S6: 200mm
Saddle
Bridge Comp, hollow Cr-mo rails. S1-S2: 155mm, S3-S6: 143mm
Grips
Deity Knuckleduster, Lock On, Black
Weight
Weight
16.90kg (37 lb, 4.1 oz)
Weight Size
S4
Shipping Policy
Components:
All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 1–4 business days of purchase.
Bicycles:
Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.
Riding Gear & Apparel:
Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 1–3 business days.
Returns & Exchanges:
If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.
For full details, please see our Refund Policy before initiating a return.
