Rear tire: 29×2.3.
Velopedia Bicycle Archive
2018 Specialized Stumpjumper Comp Alloy 29/6Fattie
Original specifications: geometry for 5 published sizes.
Selling this bike? Get the spec link and selling options
At a glance
- Model year
- 2018
- Category
- Mountain
- Original MSRP
- $2,800.00
- Sizes
- S, M, L, XL, XXL
- Colors
- Gloss Hyper/Mint Clean, Satin Black/White Clean
- Geometry
- 5 manufacturer sizes
- In this record
- 22 specifications · 4 archived images · original MSRP · geometry
- Archive ID
- 900003884
Original buildAluminum
Frameset
| Frame Construction | Specialized M5 Aluminum, 29/6Fattie Trail Geometry, PF30 BB, internal cable routing, ManFu link, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 135mm of travel |
|---|---|
| Frame Material | Aluminum |
| Fork | RockShox Reba RL, tapered alloy steerer, 51mm offset, external rebound adjust, low speed comp to lockout, 15mm Maxle® Lite thru-axle, custom 15x110 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, 28T |
| Bottom Bracket | Race Face PF30 |
| 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) Specialized, sealed cartridge bearings, 15x110mm spacing, 24h / (R) Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h |
|---|---|
| Rims | Roval Traverse 29, hookless alloy, 29mm internal width, tubeless-ready, 24/28h |
| Spokes | DT Swiss Industry, stainless, 3-cross, 2.0" |
| Front Tire | Butcher, GRID casing, Gripton compound, 2Bliss Ready, 29 x 2.3" |
| Rear Tire | Purgatory, GRID casing, Gripton compound, 2Bliss Ready, 29 x 2.3" |
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements5 sizes · 19 measurements
| Measurement | S | M | L | XL | XXL |
|---|---|---|---|---|---|
| Seat tube | 396 mm | 430 mm | 468 mm | 523 mm | 564 mm |
| Effective top tube | 551 mm | 582 mm | 611 mm | 647 mm | 674 mm |
| Head tube | 125 mm | 145 mm | 170 mm | 95 mm | 95 mm |
| Head-tube angle | 67.5° | 67.5° | 67.5° | 67.5° | 67.5° |
| Seat-tube angle | 74° | 74° | 75° | 75° | 75° |
| Chainstay / rear center | 437 mm | 437 mm | 437 mm | 437 mm | 437 mm |
| Wheelbase | 1115 mm | 1143 mm | 1172 mm | 1206 mm | 1232 mm |
| Bottom-bracket drop | 36 mm | 36 mm | 36 mm | 36 mm | 36 mm |
| Reach | 389 mm | 417 mm | 435 mm | 461 mm | 477 mm |
| Stack | 617 mm | 617 mm | 645 mm | 663 mm | 686 mm |
| Standover height | 750 mm | 757 mm | 766 mm | 776 mm | 778 mm |
| Fork offset / rake | 46 mm | 46 mm | 46 mm | 46 mm | 46 mm |
| Front center | 680 mm | 708 mm | 738 mm | 771 mm | 797 mm |
| Trail | 104 mm | 104 mm | 104 mm | 104 mm | 104 mm |
| Fork length / axle-to-crown | 551 mm | 551 mm | 551 mm | 551 mm | 551 mm |
| Seatpost length | 390 mm | 430 mm | 430 mm | 430 mm | 430 mm |
| Crank length | 170 mm | 170 mm | 170 mm | 170 mm | 170 mm |
| Stem length | 45 mm | 60 mm | 60 mm | 60 mm | 60 mm |
| Handlebar width | 780 mm | 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
Based on the original build. Confirm the model, size and fit before ordering; installed parts may differ. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases.
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 29/6Fattie · Mountain · Published sizes: S, M, L, XL, XXL
Frame and fork
Inspect the frame and fork →Archived: Frame: Specialized M5 Aluminum, 29/6Fattie Trail Geometry, PF30 BB, internal cable routing, ManFu link, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 135mm of travel · Fork: RockShox Reba RL, tapered alloy steerer, 51mm offset, external rebound adjust, low speed comp to lockout, 15mm Maxle® Lite thru-axle, custom 15x110 Boost™, 150mm of travel · Aluminum
Suspension
Evaluate the suspension →Archived: Fork: RockShox Reba RL, tapered alloy steerer, 51mm offset, external rebound adjust, low speed comp to lockout, 15mm Maxle® Lite thru-axle, custom 15x110 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, 28T · 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 29, hookless alloy, 29mm internal width, tubeless-ready, 24/28h · Hubs: (F) Specialized, sealed cartridge bearings, 15x110mm spacing, 24h / (R) Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h · Front tire: Butcher, GRID casing, Gripton compound, 2Bliss Ready, 29 x 2.3" · Rear tire: Purgatory, GRID casing, Gripton compound, 2Bliss Ready, 29 x 2.3"
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
Follow the full used-bike inspection order →Have you owned this bike?Help preserve its real-world history by sharing your owner experience.
Share the details that would help another rider understand how this model fits, rides and holds up over time. Velopedia reviews every contribution before publication.
Already contributed? Send me a fresh private edit link
For privacy, Velopedia shows the same confirmation whether or not an experience exists.
Gallery4 images
Checking current listings…
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.





