Rear tire: 29×2.
Velopedia Bicycle Archive
2018 Specialized Rockhopper Sport
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
- $710.00
- Sizes
- S, M, L, XL
- Colors
- Gloss Hyper/Black Clean, Gloss Tarmac Black/Flo Red/White
- Geometry
- 5 manufacturer sizes
- In this record
- 22 specifications · 4 archived images · original MSRP · geometry
- Archive ID
- 900003296
Model history 6 other years
Original buildAluminum
Frameset
| Frame Construction | A1 alloy, Sport XC 29 Geometry, zero-stack head tube, internal cable routing, 135x9mm forged dropouts, chainstay-mounted disc brake, replaceable alloy derailleur hanger |
|---|---|
| Frame Material | Aluminum |
| Fork | SR Suntour XCT w/ MCD 29, coil spring, custom Multi-Circuit damping, QR, 80/90/100mm travel (size-specific), 46mm offset |
Drivetrain
| Shifters | Shimano ST-EF505, Ez-Fire Plus, 3x8 |
|---|---|
| Front Derailleur | Shimano Altus FD-M313, 34.9mm clamp, down-swing |
| Rear Derailleur | Shimano Acera 8-speed |
| Crankset | Stout 3x8, forged alloy; chainrings: 44/32/22T |
| Bottom Bracket | Square taper, 73mm, internal bearings |
| BB Shell Width | 73 mm |
| Cassette | SunRace, 8-speed, 11-34t |
| Chain | KMC X8EPT, 8-speed, anti-corrosion coating w/ reusable Missing Link™ |
| Pedals | Specialized Dirt |
Brakes
| Brakes | (F) Shimano BR-M315, hydraulic disc, resin pads, 180/160mm rotor / (R) Shimano BR-M315, hydraulic disc, resin pads, 160mm rotor |
|---|
Cockpit & Contact Points
| Handlebar | Stout double-butted alloy, 10mm rise, 10-degree backsweep, 4-degree upsweep, 720mm width, 31.8mm |
|---|---|
| Stem | Stout 3D-forged alloy, 31.8mm, 6-degree rise |
| Saddle | Henge Sport, steel rails, 143mm |
| Seatpost | Alloy, 12mm offset, 2-bolt clamp, 30.9mm |
Wheels & Tires
| Hubs | (F) Shimano Center Lock, disc, 100x9mm QR, 32h / (R) Shimano Center Lock, disc, 135x9mm QR, 32h |
|---|---|
| Rims | Alloy, disc only, double-wall, 25mm internal width, 32h |
| Spokes | Stainless, 14g |
| Front Tire | Ground Control Sport, Flak Jacket flat protection, wire bead, 29x2.1" |
| Rear Tire | Fast Trak Sport, Flak Jacket flat protection, wire bead, 29x2.0" |
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements5 sizes · 20 measurements
| Measurement | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Seat tube | 370 mm | 400 mm | 430 mm | 470 mm | 520 mm |
| Effective top tube | 549 mm | 568 mm | 595 mm | 623 mm | 649 mm |
| Head tube | 110 mm | 125 mm | 95 mm | 95 mm | 95 mm |
| Head-tube angle | 69.8° | 69.8° | 69.8° | 69.8° | 69.8° |
| Seat-tube angle | 73.6° | 73.7° | 73.8° | 73.9° | 74° |
| Chainstay / rear center | 435 mm | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1060 mm | 1078 mm | 1104 mm | 1133 mm | 1159 mm |
| Bottom-bracket drop | 57.5 mm | 57.5 mm | 57.5 mm | 57.5 mm | 57.5 mm |
| Bottom-bracket height | 312.5 mm | 312.5 mm | 312.5 mm | 312.5 mm | 312.5 mm |
| Reach | 380 mm | 395 mm | 418 mm | 441 mm | 462 mm |
| Stack | 586 mm | 595 mm | 605 mm | 619 mm | 633 mm |
| Standover height | 715 mm | 750 mm | 775 mm | 814 mm | 845 mm |
| Fork offset / rake | 51 mm | 51 mm | 51 mm | 51 mm | 51 mm |
| Front center | 631 mm | 650 mm | 676 mm | 704 mm | 730 mm |
| Trail | 82 mm | 82 mm | 82 mm | 82 mm | 82 mm |
| Fork length / axle-to-crown | 486 mm | 496 mm | 506 mm | 506 mm | 506 mm |
| Seatpost length | 350 mm | 350 mm | 400 mm | 400 mm | 400 mm |
| Crank length | 165 mm | 170 mm | 175 mm | 175 mm | 175 mm |
| Stem length | 60 mm | 70 mm | 90 mm | 100 mm | 110 mm |
| Handlebar width | 720 mm | 720 mm | 720 mm | 720 mm | 720 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 PC-870 Chain One Color, 8 Speed, 114 Links
8 Speed, 114 Links
Replacement option · verify fit
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 20 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 Rockhopper Sport · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: A1 alloy, Sport XC 29 Geometry, zero-stack head tube, internal cable routing, 135x9mm forged dropouts, chainstay-mounted disc brake, replaceable alloy derailleur hanger · Fork: SR Suntour XCT w/ MCD 29, coil spring, custom Multi-Circuit damping, QR, 80/90/100mm travel (size-specific), 46mm offset
Suspension
Evaluate the suspension →Archived: Fork: SR Suntour XCT w/ MCD 29, coil spring, custom Multi-Circuit damping, QR, 80/90/100mm travel (size-specific), 46mm offset
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano ST-EF505, Ez-Fire Plus, 3x8 · Front derailleur: Shimano Altus FD-M313, 34.9mm clamp, down-swing · Rear derailleur: Shimano Acera 8-speed · Crankset: Stout 3x8, forged alloy; chainrings: 44/32/22T · Bottom bracket: Square taper, 73mm, internal bearings · Cassette: SunRace, 8-speed, 11-34t · Chain: KMC X8EPT, 8-speed, anti-corrosion coating w/ reusable Missing Link™
Brakes
Inspect the brakes →Archived: Brakes: (F) Shimano BR-M315, hydraulic disc, resin pads, 180/160mm rotor / (R) Shimano BR-M315, hydraulic disc, resin pads, 160mm rotor
Wheels and tires
Check wheels and tires →Archived: Rims: Alloy, disc only, double-wall, 25mm internal width, 32h · Hubs: (F) Shimano Center Lock, disc, 100x9mm QR, 32h / (R) Shimano Center Lock, disc, 135x9mm QR, 32h · Front tire: Ground Control Sport, Flak Jacket flat protection, wire bead, 29x2.1" · Rear tire: Fast Trak Sport, Flak Jacket flat protection, wire bead, 29x2.0"
Controls and contact points
Archived: Handlebar: Stout double-butted alloy, 10mm rise, 10-degree backsweep, 4-degree upsweep, 720mm width, 31.8mm · Stem: Stout 3D-forged alloy, 31.8mm, 6-degree rise · Seatpost: Alloy, 12mm offset, 2-bolt clamp, 30.9mm · Saddle: Henge Sport, steel rails, 143mm · Pedals: Specialized Dirt
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.





