Specialized Stumpjumper 15 Comp Alloy Mountain Bike 2025 - Trail Full Suspension MTB
The Stumpjumper 15 Comp Alloy blends playfulness and precision, giving riders a balanced, controlled experience on any terrain. With its lightweight alloy frame, advanced suspension system, and Shimano SLX drivetrain, it offers a smooth ride with efficient power transfer.
Key Features:
- Frame: M5 alloy frame, Trail Geometry, SWAT™ door integration, 145mm travel
- Front Suspension: FOX FLOAT 36 Rhythm, GRIP damper, 150mm travel
- Rear Suspension: FOX FLOAT Performance, Specialized GENIE Shock Tech, 145mm travel
- Drivetrain: Shimano SLX M7100, 12-speed, smooth and efficient shifting
- Brakes: TRP Trail EVO 4-piston hydraulic disc brakes for powerful, responsive stopping
- Wheels: Specialized alloy rims, 29” front and rear (27.5” for S1-S2), tubeless ready
- Finance: Available with 0% APR finance options
Specialized Stumpjumper Review
The Stumpjumper 15 Comp Alloy is made to push the limits of trail riding. Its M5 alloy frame is durable and lightweight, with the added bonus of SWAT™ Door integration, allowing riders to store tools and gear on the go. The FOX FLOAT Performance rear shock with Specialized's innovative GENIE technology provides excellent traction and control, with adjustments to customise your ride. The FOX FLOAT 36 Rhythm fork, featuring a GRIP damper, gives the front end the confidence it needs for tackling rough terrain.
The Shimano SLX 12-speed drivetrain ensures smooth, reliable gear changes when you need them most, while the TRP Trail EVO brakes deliver serious stopping power for technical descents. The bike’s tubeless-ready Specialized alloy rims, paired with GRID TRAIL tyres, ensure exceptional grip and stability across a range of surfaces.
The X-Fusion Manic dropper post adds a layer of personalisation, allowing for quick, easy seat height adjustments to match the trail ahead. And with 0% APR finance available, getting this trail-ready machine is more accessible than ever.
Occasionally, without notice, manufacturers change product design and/or specifications.
| 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 of travel |
| Fork | FOX FLOAT 36 Rhythm, GRIP damper, two position Sweep adjustment, 15x110mm QR axle, 44mm offset, S1:140mm of travel, S2-S6:150mm of travel |
| Rear Shock | FOX FLOAT Performance with Specialized GENIE Shock Tech, Ride Dynamics Trail Tune, 2-position lever w/ LSR adjustment, S1:210x52.5mm, S2-S6:210x55mm |
| Stem | Alloy Trail Stem, 35mm bar bore |
| Bars | 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 |
| Front Brake | TRP Trail EVO, 4-piston caliper, hydraulic disc, 203mm |
| Rear Brake | TRP Trail EVO, 4-piston caliper, hydraulic disc, S1-S2: 180mm, S3-S6: 203mm |
| Rear Mech | Shimano SLX M7100, SGS, 12-speed |
| Shifters | Shimano SLX, M7100, 12spd |
| Speed | 12 |
| Rims | Specialized, hookless alloy, 30mm inner width, tubeless ready, Front: 29, Rear: S1-S2: 27.5, S3- S6: 29 |
| Front Hub | Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28 |
| Rear Hub | Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h |
| Front Tyre | Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3" |
| Rear Tyre | Eliminator, GRID TRAIL casing, GRIPTON® T7 compound, 2Bliss Ready, S1-S2: 27.5x2.3, S3- S6: 29x2.3" |
| Seat Post | X-Fusion Manic, infinite adjustable, two-bolt head, bottom mount cable routing, remote SLR LE lever, 34.9, S1: 125mm, S2: 150mm, S3: 170mm, S4-S6: 190mm |
| Saddle | Bridge Comp, Hollow Cr-mo rails, S1-S2: 155mm, S3-S6: 143mm |
| Chainset | Shimano SLX, M7120, 32T ring, 55mm chainline, S1-S3:165mm, S4-S6: 170mm |
| Bottom Bracket | Shimano, BB-MT801, Threaded |
| Chain | Shimano SLX, M7100, 12-speed |
| Cassette | Shimano SLX, CS-M7100, 12-speed, 10-51t |
| Pedals | Resin Platform |
| Weight | 16.17 kg |
Specialized Stumpjumper 15 Size Chart
|
Size |
Height (cm) |
Height (inches) |
|
S1 (XS) |
150 – 160 |
4’11” – 5’3” |
|
S2 (S) |
157 – 173 |
5’2” – 5’8” |
|
S3 (M) |
165 – 180 |
5’5” – 5’11” |
|
S4 (L) |
173 – 188 |
5’8” – 6’2” |
|
S5 (XL) |
178 – 193 |
5’10” – 6’4” |
|
S6 (XXL) |
188 - 203 |
6’2” – 6’3” |
Find your S Size
Determining your S-Size is easy. If you rode a Medium before, then S-3 will be your equivalent size. But if you want a more nimble ride, you should drop down to an S2. Want a bike that’s more stable at speed? Bump up to an S4. Following are examples of three riders, all 5’8” (1.73m), who chose three different sizes.
Specialized Stumpjumper 15 Geometry
|
|
S1 (XS) |
S2 (S) |
S3 (M) |
S4 (L) |
S5 (XL) |
S6 (XXL) |
|
Crank Length |
165mm |
165mm |
165mm |
170mm |
170mm |
170mm |
|
Handlebar Width |
780mm |
780mm |
800mm |
800mm |
800mm |
800mm |
|
Stem Length |
35mm |
35mm |
35mm |
35mm |
35mm |
35mm |
|
Saddle Width |
155mm |
155mm |
143mm |
143mm |
143mm |
143mm |
|
Seatpost Length |
125mm |
150mm |
170mm |
170mm |
170mm |
170mm |
|
Stack |
608mm |
618mm |
627mm |
640mm |
654mm |
667mm |
|
Reach |
400mm |
425mm |
450mm |
475mm |
500mm |
530mm |
|
Headtube Length |
95mm |
100mm |
110mm |
125mm |
140mm |
155mm |
|
Headtube Angle |
64.5° |
64.5° |
64.5° |
64.5° |
64.5° |
64.5° |
|
BB Height |
334mm |
337mm |
337mm |
337mm |
337mm |
337mm |
|
BB Drop |
41mm |
38mm |
38mm |
38mm |
38mm |
38mm |
|
Trail |
129mm |
130mm |
130mm |
130mm |
130mm |
130mm |
|
Fork Length (full) |
551mm |
561mm |
561mm |
561mm |
561mm |
561mm |
|
Fork Rake/Offset |
44mm |
44mm |
44mm |
44mm |
44mm |
44mm |
|
Front Centre |
720mm |
751mm |
780mm |
812mm |
843mm |
879mm |
|
Chainstay Length |
430mm |
432mm |
435mm |
435mm |
445mm |
445mm |
|
Wheelbase |
1149mm |
1181mm |
1213mm |
1244mm |
1285mm |
1322mm |
|
Top-tube Length (horizontal) |
541mm |
573mm |
595mm |
624mm |
647mm |
677mm |
|
Bike Standover Height |
738mm |
751mm |
745mm |
745mm |
745mm |
751mm |
|
Seat Tube Length |
385mm |
385mm |
405mm |
425mm |
445mm |
465mm |
|
Seat Tube Angle |
78° |
77° |
77° |
76.5° |
76.5° |
76.5° |
|
Saddle Height for Effective ST Angle |
645mm |
690mm |
735mm |
780mm |
825mm |
870mm |
|
Max Seatpost Insertion |
245mm |
245mm |
255mm |
255mm |
285mm |
285mm |
|
Min Seatpost Insertion |
80mm |
80mm |
80mm |
80mm |
80mm |
80mm |
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