Rear tire: 27.5×2.8.
Velopedia Bicycle Archive
2018 Specialized Stumpjumper Expert 6Fattie/29
Original specifications: geometry for 4 published sizes.
Selling this bike? Get the spec link and selling options
At a glance
- Model year
- 2018
- Category
- Mountain
- Sizes
- S, M, L, XL
- Colors
- Heritage Gloss Acid Mint/Acid Kiwi/Acid Pink, Satin Silver Tint Carbon/Black/Rocket Red Clean
- Geometry
- 4 manufacturer sizes
- In this record
- 21 specifications · 2 archived images · geometry
- Archive ID
- 900003385
Original buildCarbon Fiber
Frameset
| Frame Construction | FACT 9m carbon front chassis w/ Specialized M5 Aluminum rear end, 29/6Fattie Trail Geometry, SWAT™ Door integration, PF30 BB, fully enclosed internal cable routing, ManFu link, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 135mm of travel |
|---|---|
| Frame Material | Carbon Fiber |
| Fork | FOX 34 Performance 29/6Fattie, 51mm offset, 15x110mm thru-axle, 150mm of travel |
| Rear Shock | RockShox Monarch RT3, Rx Trail Tune, AUTOSAG, rebound and 3-position compression adjust, 197x48mm |
Drivetrain
| Shifters | SRAM GX Eagle, trigger, 12-speed |
|---|---|
| Rear Derailleur | SRAM GX Eagle, 12-speed |
| Crankset | Truvativ Descendant, aluminum, Boost™ 148, 170mm crankarm, 30mm spindle; chainrings: 30T |
| Bottom Bracket | Pf30 |
| Cassette | SRAM GX Eagle, 12-speed, 10-50t |
| Chain | SRAM GX Eagle, 12-speed w/ PowerLock® |
| 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 Trail, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp |
|---|---|
| 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 Carbon 27.5, hookless carbon, 38mm inner width, 24/28h, tubeless ready, hand-built |
| Spokes | DT Swiss Industry, stainless, 3-cross, 2.0" |
| Front Tire | Purgatory, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 3.0" |
| Rear Tire | Slaughter, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 2.8" |
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements4 sizes · 19 measurements
| Measurement | S | M | L | XL |
|---|---|---|---|---|
| Seat tube | 396 mm | 430 mm | 468 mm | 523 mm |
| Effective top tube | 563 mm | 590 mm | 616 mm | 648 mm |
| Head tube | 125 mm | 145 mm | 95 mm | 95 mm |
| Head-tube angle | 67° | 67° | 67° | 67° |
| Seat-tube angle | 74° | 74° | 74° | 74° |
| Chainstay / rear center | 437 mm | 437 mm | 437 mm | 437 mm |
| Wheelbase | 1122 mm | 1149 mm | 1179 mm | 1212 mm |
| Bottom-bracket drop | 33 mm | 33 mm | 33 mm | 33 mm |
| Reach | 386 mm | 413 mm | 431 mm | 457 mm |
| Stack | 618 mm | 618 mm | 646 mm | 664 mm |
| Standover height | 754 mm | 761 mm | 770 mm | 777 mm |
| Fork offset / rake | 51 mm | 51 mm | 51 mm | 51 mm |
| Front center | 687 mm | 714 mm | 744 mm | 777 mm |
| Trail | 96.5 mm | 96.5 mm | 96.5 mm | 96.5 mm |
| Fork length / axle-to-crown | 560 mm | 560 mm | 560 mm | 560 mm |
| Seatpost length | 390 mm | 430 mm | 430 mm | 430 mm |
| Crank length | 170 mm | 170 mm | 170 mm | 170 mm |
| Stem length | 45 mm | 60 mm | 60 mm | 60 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 Eagle 12-Speed Chain Silver, 126 links
126 links

SRAM XG-1275 GX Eagle 12-Speed Cassette Black, 10-50t
10-50t
More parts (6)
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 Expert 6Fattie/29 · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Carbon Fiber · Fork: FOX 34 Performance 29/6Fattie, 51mm offset, 15x110mm thru-axle, 150mm of travel
Suspension
Evaluate the suspension →Archived: Fork: FOX 34 Performance 29/6Fattie, 51mm offset, 15x110mm thru-axle, 150mm of travel · Rear shock: RockShox Monarch RT3, Rx Trail Tune, AUTOSAG, rebound and 3-position compression adjust, 197x48mm
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM GX Eagle, trigger, 12-speed · Rear derailleur: SRAM GX Eagle, 12-speed · Crankset: Truvativ Descendant, aluminum, Boost™ 148, 170mm crankarm, 30mm spindle; chainrings: 30T · Bottom bracket: PF30 · Cassette: SRAM GX Eagle, 12-speed, 10-50t · Chain: SRAM GX Eagle, 12-speed w/ PowerLock®
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 Carbon 27.5, hookless carbon, 38mm inner width, 24/28h, tubeless ready, hand-built · Hubs: (F) Specialized, sealed cartridge bearings, 15x110mm spacing, 24h / (R) Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h · Front tire: Purgatory, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 3.0" · Rear tire: Slaughter, GRID casing, Gripton compound, 2Bliss Ready, 27.5 x 2.8"
Controls and contact points
Archived: Handlebar: Specialized Trail, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp · 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.





