Velopedia Bicycle Archive
2018 Cannondale F-Si Carbon 3
Original specifications: 27.5" wheels · geometry for 4 published sizes.
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At a glance
- Model year
- 2018
- Category
- Mountain
- Sizes
- S (27.5"), M (29"), L (29"), XL (29")
- Colors
- Nearly Black w/ Jet Black and Acid Red - Gloss (NBL)
- Geometry
- 4 manufacturer sizes
- In this record
- 23 specifications · archived image · geometry
- Archive ID
- 900002665
Original buildCarbon · 27.5"
Frameset
| Frame Construction | F-Si, BallisTec Carbon, SPEED SAVE, PF30A, 1.5 Si Head Tube, Ai Offset, 27.5” (S), 29” (M-XL) |
|---|---|
| Frame Material | Carbon |
| Fork | Lefty 2.0 Alloy OPI, 2Spring, 100mm, PBR Isolated Damper Technology with XC+ tune, 55mm offset (29), 50mm offset (27.5) |
| Fork Material | Aluminum |
Drivetrain
| Shifters | Shimano XT, 2x11 |
|---|---|
| Front Derailleur | Shimano XT, direct mount |
| Rear Derailleur | Shimano XT, Shadow Plus, 11-speed |
| Crankset | Cannondale Si, Ai, BB30, FSA 26/36 rings |
| Bottom Bracket | Cannondale Alloy PressFit30 |
| Rear Cogs | Shimano SLX , 11-42, 11-speed |
| Chain | Shimano CN-HG601, 11-speed |
Brakes
| Brakes | Magura MT-RACE w/ Storm SL Rotors, 180/160mm |
|---|
Cockpit & Contact Points
| Headset | Cannondale HeadShok Si |
|---|---|
| Handlebar | Cannondale C2 flat, Butted AL2014 Alloy, 700mm |
| Stem | Cannondale C1, 6061 Alloy, 1.5”, 31.8, -5° |
| Saddle | Prologo Zero II STN Rail |
| Seatpost | Cannondale C2, 7075 alloy, 27.2mm x 400mm |
Wheels & Tires
| Hubs | Lefty 60 front, Custom Formula 1702 Ai Offset dish - Rear |
|---|---|
| Rims | Stan’s NoTubes Crest MK3, Tubeless Ready |
| Spokes | DT-Swiss Competition (Ai Offset dish - Rear) |
| Front Tire | Schwalbe Racing Ralph EVO Performance, 29/27.5x2.1”, Tubeless Ready |
| Rear Tire | Schwalbe Racing Ralph EVO Performance, 29/27.5x2.1”, Tubeless Ready |
| Wheel Size | 27.5" |
Geometry
Frame measurements by size.
Published frame view
Select an available measurement to locate it on the frame.
All geometry measurements4 sizes · 16 measurements
| Measurement | S (27.5") | M (29") | L (29") | XL (29") |
|---|---|---|---|---|
| Seat tube | 385 mm | 435 mm | 485 mm | 535 mm |
| Effective top tube | 570 mm | 596 mm | 622 mm | 649 mm |
| Top tube | 544 mm | 565 mm | 590 mm | 617 mm |
| Head tube | 97 mm | 97 mm | 110 mm | 122 mm |
| Head-tube angle | 69° | 69.7° | 69.8° | 69.9° |
| Seat-tube angle | 73.3° | 73.2° | 73.1° | 73° |
| Chainstay / rear center | 425 mm | 429 mm | 429 mm | 429 mm |
| Wheelbase | 1072 mm | 1097 mm | 1122 mm | 1147 mm |
| Bottom-bracket drop | 45 mm | 62 mm | 62 mm | 62 mm |
| Bottom-bracket height | 308 mm | 308 mm | 308 mm | 308 mm |
| Reach | 399 mm | 414 mm | 435 mm | 457 mm |
| Stack | 569 mm | 603 mm | 615 mm | 628 mm |
| Standover height | 737 mm | 777 mm | 806 mm | 837 mm |
| Fork offset / rake | 50 mm | 55 mm | 55 mm | 55 mm |
| Front center | 656 mm | 676 mm | 700 mm | 725 mm |
| Trail | 82 mm | 78 mm | 78 mm | 77 mm |
Measurements may vary by configuration, wheel size, or frame setting where noted in the published chart.
Gearing
Lower ratios provide more mechanical advantage for climbing. Higher ratios turn the rear wheel farther with each crank revolution.
Parts & serviceability
Find replacement parts

Shimano SLX/105 CN-HG601 11-Speed Chain Grey, 126 Links
126 Links
More parts (6)

Shimano Deore XT RD-M8230 Rear Derailleur Max 50t, Min 11t, 11-Speed
11-Speed

Cervelo SP19 Carbon Seatpost Black, 27.2mm, 0mm offset, 350mm long
27.2mm, 0mm offset, 350mm long
Replacement option · verify fit
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 21 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 F-Si Carbon 3 · Mountain · Published sizes: S (27.5"), M (29"), L (29"), XL (29")
Frame and fork
Inspect the frame and fork →Archived: Frame: F-Si, BallisTec Carbon, SPEED SAVE, PF30A, 1.5 Si Head Tube, Ai Offset, 27.5” (S), 29” (M-XL) · Fork: Lefty 2.0 Alloy OPI, 2Spring, 100mm, PBR Isolated Damper Technology with XC+ tune, 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, 55mm offset (29), 50mm offset (27.5)
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano XT, 2x11 · Front derailleur: Shimano XT, direct mount · Rear derailleur: Shimano XT, Shadow Plus, 11-speed · Crankset: Cannondale Si, Ai, BB30, FSA 26/36 rings · Bottom bracket: Cannondale Alloy PressFit30 · Rear cogs: Shimano SLX , 11-42, 11-speed · Chain: Shimano CN-HG601, 11-speed
Brakes
Inspect the brakes →Archived: Brakes: Magura MT-RACE w/ Storm SL Rotors, 180/160mm
Wheels and tires
Check wheels and tires →Archived: Wheel size: 27.5" · Rims: Stan’s NoTubes Crest MK3, Tubeless Ready · Hubs: Lefty 60 front, Custom Formula 1702 Ai Offset dish - Rear · Front tire: Schwalbe Racing Ralph EVO Performance, 29/27.5x2.1”, Tubeless Ready · Rear tire: Schwalbe Racing Ralph EVO Performance, 29/27.5x2.1”, Tubeless Ready
Controls and contact points
Archived: Headset: Cannondale HeadShok Si · Handlebar: Cannondale C2 flat, Butted AL2014 Alloy, 700mm · Stem: Cannondale C1, 6061 Alloy, 1.5”, 31.8, -5° · Seatpost: Cannondale C2, 7075 alloy, 27.2mm x 400mm · Saddle: Prologo Zero II STN Rail
Before and during the test ride
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.



