Rear tire: 27.5×2.6.
Velopedia Bicycle Archive
2018 Specialized Stumpjumper Comp Alloy 27.5
Original specifications: geometry for 4 published sizes.
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At a glance
- Model year
- 2018
- Category
- Mountain
- Original MSRP
- $2,800.00
- Sizes
- S, M, L, XL
- Colors
- Gloss Hyper/Mint Clean, Satin Black/White Clean
- Geometry
- 4 manufacturer sizes
- In this record
- 23 specifications · 2 archived images · original MSRP · geometry
- Archive ID
- 900003398
Model history 1 other year
Original buildAluminum
Frameset
| Frame Construction | Specialized M5 Aluminum, 27.5 Trail Geometry, PF30 BB, internal cable routing, ManFu link, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 150mm of travel |
|---|---|
| Frame Material | Aluminum |
| Fork | FOX FLOAT Rhythm 34 27.5, 44mm offset, 2-position, tapered alloy steerer, 15x110mm Boost™, 150mm of travel |
| Fork Material | Aluminum |
| Rear Shock | RockShox Monarch RT, Rx Trail Tune, AUTOSAG, rebound and 2-position compression adjust, 197x48mm |
Drivetrain
| Shifters | SRAM GX, trigger, 11-speed |
|---|---|
| Rear Derailleur | SRAM GX, long cage, 11-speed |
| Crankset | Race Face Aeffect, PF30; chainrings: Steel, 30T |
| Bottom Bracket | Race Face PF30 |
| BB Shell Width | 24 mm |
| Cassette | SRAM XG 1150, 11-speed, 10-42t |
| Chain | KMC X11, 11-speed w/ Missing Link™ |
| Pedals | Specialized Platform, Cr-Mo, 9/16" spindle |
Brakes
| Brakes | (F) SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200/180mm rotor / (R) SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180/160mm rotor |
|---|
Cockpit & Contact Points
| Handlebar | Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm width |
|---|---|
| Stem | Specialized Trail, 3D forged alloy, 4-bolt, 6-degree rise |
| Saddle | Body Geometry Henge Comp, hollow Cr-Mo rails, 143mm |
| Seatpost | Command Post IRcc, 12-position micro-height adjustable, alien head design, bottom mount cable routing, remote SRL lever, 30.9mm, S: 100mm, M/L/XL: 125mm of travel |
Wheels & Tires
| Hubs | (F) Stout Pro 110 disc, alloy sealed cartridge bearings, 15x110mm spacing, 24h / (R) Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h |
|---|---|
| Rims | Roval Traverse 27.5, hookless alloy, 29mm inner width, tubeless ready, 24/28h |
| Spokes | DT Swiss Industry, stainless, 3-cross, 2.0" |
| Front Tire | Butcher, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 2.6" |
| Rear Tire | Butcher, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 2.6" |
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements4 sizes · 20 measurements
| Measurement | S | M | L | XL |
|---|---|---|---|---|
| Seat tube | 380 mm | 410 mm | 455 mm | 505 mm |
| Effective top tube | 570 mm | 595 mm | 627 mm | 660 mm |
| Head tube | 105 mm | 110 mm | 140 mm | 155 mm |
| Head-tube angle | 65.5° | 65.5° | 65.5° | 65.5° |
| Seat-tube angle | 75.3° | 75° | 74.6° | 74.2° |
| Chainstay / rear center | 432 mm | 432 mm | 432 mm | 432 mm |
| Wheelbase | 1157 mm | 1179 mm | 1212 mm | 1243 mm |
| Bottom-bracket drop | 21 mm | 21 mm | 21 mm | 21 mm |
| Bottom-bracket height | 336 mm | 336 mm | 336 mm | 336 mm |
| Reach | 415 mm | 435 mm | 455 mm | 480 mm |
| Stack | 592 mm | 596 mm | 623 mm | 637 mm |
| Standover height | 752 mm | 757 mm | 769 mm | 770 mm |
| Fork offset / rake | 46 mm | 46 mm | 46 mm | 46 mm |
| Front center | 726 mm | 748 mm | 780 mm | 812 mm |
| Trail | 112 mm | 112 mm | 112 mm | 112 mm |
| Fork length / axle-to-crown | 542 mm | 542 mm | 542 mm | 542 mm |
| Seatpost length | 376 mm | 438 mm | 438 mm | 438 mm |
| Crank length | 170 mm | 170 mm | 170 mm | 170 mm |
| Stem length | 45 mm | 45 mm | 45 mm | 45 mm |
| Handlebar width | 780 mm | 780 mm | 780 mm | 780 mm |
Dimensions as recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM = pedal turns per minute.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Parts & serviceability
Find replacement parts

SRAM GX XG-1150 11-Speed Cassette Black, 10-42T
10-42T
More parts (6)

SRAM GX 1x11 Rear Derailleur Black, Long Cage
Long Cage
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Bike-specific inspection checklist 23 checks based on 6 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2018 Specialized Stumpjumper Comp Alloy 27.5 · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Specialized M5 Aluminum, 27.5 Trail Geometry, PF30 BB, internal cable routing, ManFu link, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 150mm of travel · Fork: FOX FLOAT Rhythm 34 27.5, 44mm offset, 2-position, tapered alloy steerer, 15x110mm Boost™, 150mm of travel · Aluminum
Suspension
Evaluate the suspension →Archived: Fork: FOX FLOAT Rhythm 34 27.5, 44mm offset, 2-position, tapered alloy steerer, 15x110mm Boost™, 150mm of travel · Rear shock: RockShox Monarch RT, Rx Trail Tune, AUTOSAG, rebound and 2-position compression adjust, 197x48mm
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM GX, trigger, 11-speed · Rear derailleur: SRAM GX, long cage, 11-speed · Crankset: Race Face Aeffect, PF30; chainrings: Steel, 30T · Bottom bracket: Race Face PF30 · Cassette: SRAM XG 1150, 11-speed, 10-42t · Chain: KMC X11, 11-speed w/ Missing Link™
Brakes
Inspect the brakes →Archived: Brakes: (F) SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200/180mm rotor / (R) SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180/160mm rotor
Wheels and tires
Check wheels and tires →Archived: Rims: Roval Traverse 27.5, hookless alloy, 29mm inner width, tubeless ready, 24/28h · Hubs: (F) Stout Pro 110 disc, alloy sealed cartridge bearings, 15x110mm spacing, 24h / (R) Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h · Front tire: Butcher, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 2.6" · Rear tire: Butcher, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 2.6"
Controls and contact points
Archived: Handlebar: Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm width · Stem: Specialized Trail, 3D forged alloy, 4-bolt, 6-degree rise · Seatpost: Command Post IRcc, 12-position micro-height adjustable, alien head design, bottom mount cable routing, remote SRL lever, 30.9mm, S: 100mm, M/L/XL: 125mm of travel · Saddle: Body Geometry Henge Comp, hollow Cr-Mo rails, 143mm · Pedals: Specialized Platform, Cr-Mo, 9/16" spindle
Before and during the test ride
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Gallery2 images
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.





