Speed unavailable: wheel or tire size is missing or unclear.
Velopedia Bicycle Archive
2018 Cannondale Scalpel-Si 5
Original specifications: 29" wheels · geometry for 4 published sizes.
Planning to sell? Draft your listing
At a glance
Archive #900002709- Model year
- 2018
- Category
- Mountain
- Sizes
- S (27.5"), M (29"), L (29"), XL (29")
- Colors
- Matte Jet Black w/ Gloss Jet Black and Ultra Blue - Matte (BLK)
- Geometry
- 4 manufacturer sizes
- In this record
- 24 specifications · archived image · geometry
Model history 1 other year
Browse other years
Compare side by side
Identification clues
2018 archived details
- Published colors
- Matte Jet Black w/ Gloss Jet Black and Ultra Blue - Matte (BLK)
- Frame
- Carbon
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildCarbon · 29"
Frameset
| Frame Construction | Scalpel-Si, 100mm, SmartForm C1 Alloy, Zero Pivot seatstay, Carbon Link, PF30, 1.5 Si head tube, Ai Offset |
|---|---|
| Frame Material | Carbon |
| Fork | Lefty 2.0 Alloy OPI, 2Spring, 100mm, PBR Isolated Damper Technology with XC+ tune and updated controls, 55mm offset (29), 50mm offset (27.5) |
| Fork Material | Aluminum |
| Rear Shock | RockShox Monarch RL, 100mm |
Drivetrain
| Shifters | SRAM S Series, 2x11 |
|---|---|
| Front Derailleur | Shimano XT, side swing |
| Rear Derailleur | SRAM GX, 11-speed |
| Crankset | Cannondale Si, BB30, 36/26 CNC Rings |
| Bottom Bracket | Cannondale Alloy PressFit30 |
| Rear Cogs | SRAM PG-1130, 11-speed, 11-42 |
| Chain | SRAM 11-speed |
Brakes
| Brakes | Shimano Deore MT500 hydro disc, 180/160mm |
|---|
Cockpit & Contact Points
| Headset | Cannondale HeadShok Si |
|---|---|
| Handlebar | Cannondale C2 flat, Butted AL2014 Alloy, 760mm |
| Stem | Cannondale C1, 6061 Alloy, 1.5”, 31.8, -5° |
| Saddle | Prologo K3 |
| Seatpost | Cannondale C3, Micro Adjust, 6061 Alloy, 31.6x350mm (XS,S,M) 400mm (L,X) |
Wheels & Tires
| Hubs | Lefty 60 front, Formula DHT-142x12, (Ai Offset dish - Rear) |
|---|---|
| Rims | Stan’s NoTubes Crest S1, 32 hole, tubeless ready |
| Spokes | DT-Swiss Champion (Ai Offset dish - Rear) |
| Front Tire | Schwalbe Racing Ralph Performance, 29x2.25”, folding |
| Rear Tire | Schwalbe Racing Ralph Performance, 29x2.25”, folding |
| Wheel Size | 29" |
No specifications match. Try a component name or clear your search.
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements4 sizes · 15 measurements
| Measurement | S (27.5") | M (29") | L (29") | XL (29") |
|---|---|---|---|---|
| Seat tube | 400 mm | 440 mm | 480 mm | 520 mm |
| Effective top tube | 570 mm | 599 mm | 624 mm | 648 mm |
| Head tube | 97 mm | 110 mm | 122 mm | 134 mm |
| Head-tube angle | 69.5° | 69.5° | 69.5° | 69.5° |
| Seat-tube angle | 73.5° | 73.5° | 73.5° | 73.5° |
| Chainstay / rear center | 425 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1079 mm | 1118 mm | 1144 mm | 1169 mm |
| Bottom-bracket drop | 20 mm | 38 mm | 38 mm | 38 mm |
| Bottom-bracket height | 333 mm | 334 mm | 334 mm | 334 mm |
| Reach | 407 mm | 424 mm | 445 mm | 466 mm |
| Stack | 550 mm | 592 mm | 604 mm | 615 mm |
| Standover height | 716 mm | 754 mm | 760 mm | 766 mm |
| Fork offset / rake | 50 mm | 55 mm | 55 mm | 55 mm |
| Front center | 653 mm | 685 mm | 711 mm | 735 mm |
| Trail | 75 mm | 77 mm | 77 mm | 77 mm |
Dimensions as recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM = pedal turns per minute.
Rear tire: 29×2.25.
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.
Try your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
Find replacement parts
11-speed, 11-42

SRAM NX PG-1130 11-Speed Cassette One Color, 11-42t
Model match
29x2.25”, folding

Schwalbe Racing Ralph Performance Tubeless Tire - 29in Black, TwinSkin Addix, 29x2.25in
Model match
11-speed
Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.
SRAM GX 1x11 Rear Derailleur Black, Long Cage
Specification match
More parts (5)Fewer parts
Micro Adjust, 6061 Alloy, 31.6x350mm (XS,S,M) 400mm (L,X)

Race Face Turbine Seatpost Black, 31.6 x 400
Replacement option
side swing
Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.2x11
Formula DHT-142x12, (Ai Offset dish - Rear)
Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.
Service essentialsQuick reference before buying parts
Archived specifications for reference. Check the fitted parts before ordering.
- Front tire
- Schwalbe Racing Ralph Performance, 29x2.25”, foldingCheck: Verify the fitted tire’s size marking and rim type.
- Rear tire
- Schwalbe Racing Ralph Performance, 29x2.25”, foldingCheck: Verify the rear size; it may differ from the front.
- Drivetrain
- 11-speedCheck: Match the installed drivetrain family, not just its speed count.
- Seatpost diameter
- 31.6 mmCheck: Read the post’s diameter marking; seat-clamp size differs.
- Bottom bracket / shell
- Cannondale Alloy PressFit30Check: Verify shell type and width, crank interface, and spindle length or spacers.
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 Cannondale Scalpel-Si 5 · Mountain · Published sizes: S (27.5"), M (29"), L (29"), XL (29")
Frame and fork
Inspect the frame and fork →Archived: Frame: Scalpel-Si, 100mm, SmartForm C1 Alloy, Zero Pivot seatstay, Carbon Link, PF30, 1.5 Si head tube, Ai Offset · Fork: Lefty 2.0 Alloy OPI, 2Spring, 100mm, PBR Isolated Damper Technology with XC+ tune and updated controls, 55mm offset (29), 50mm offset (27.5) · Aluminum
Suspension
Evaluate the suspension →Archived: Fork: Lefty 2.0 Alloy OPI, 2Spring, 100mm, PBR Isolated Damper Technology with XC+ tune and updated controls, 55mm offset (29), 50mm offset (27.5) · Rear shock: RockShox Monarch RL, 100mm
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM S Series, 2x11 · Front derailleur: Shimano XT, side swing · Rear derailleur: SRAM GX, 11-speed · Crankset: Cannondale Si, BB30, 36/26 CNC Rings · Bottom bracket: Cannondale Alloy PressFit30 · Rear cogs: SRAM PG-1130, 11-speed, 11-42 · Chain: SRAM 11-speed
Brakes
Inspect the brakes →Archived: Brakes: Shimano Deore MT500 hydro disc, 180/160mm
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29" · Rims: Stan’s NoTubes Crest S1, 32 hole, tubeless ready · Hubs: Lefty 60 front, Formula DHT-142x12, (Ai Offset dish - Rear) · Front tire: Schwalbe Racing Ralph Performance, 29x2.25”, folding · Rear tire: Schwalbe Racing Ralph Performance, 29x2.25”, folding
Controls and contact points
Archived: Headset: Cannondale HeadShok Si · Handlebar: Cannondale C2 flat, Butted AL2014 Alloy, 760mm · Stem: Cannondale C1, 6061 Alloy, 1.5”, 31.8, -5° · Seatpost: Cannondale C3, Micro Adjust, 6061 Alloy, 31.6x350mm (XS,S,M) 400mm (L,X) · Saddle: Prologo K3
Before and during the test ride
Follow the full used-bike inspection order →Have you owned this model?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.
Checking current listings…
Find this bike on eBay
Search eBay US; check the model year, size and installed components. We may earn a commission from purchases.
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.




