Velopedia Bicycle Archive
2018 Cannondale F-Si Carbon 5
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
- Acid Red w/ Jet Black - Gloss (ARD)
- Geometry
- 4 manufacturer sizes
- In this record
- 21 specifications · archived image · geometry
- Archive ID
- 900002664
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 | RockShox Reba RL, 100mm, Solo Air, Tapered Steerer, Maxle Lite, 51mm offset |
Drivetrain
| Shifters | Shimano SLX , 11-speed |
|---|---|
| Rear Derailleur | Shimano XT, 11-speed Shadow Plus |
| Crankset | Cannondale Si, BB30 w/ Ai SpideRing, X-Sync®, 32t |
| Bottom Bracket | Cannondale Alloy PressFit30 |
| Rear Cogs | SunRace, 11-46, 11-speed |
| Chain | KMC X11, 11-speed |
Brakes
| Brakes | Shimano Deore MT-500 hydro disc, 180/160mm (S-160/160mm) |
|---|
Cockpit & Contact Points
| Headset | Cannondale HeadShok Si |
|---|---|
| Handlebar | Cannondale C3 flat, 6061 double-butted Alloy, 760mm |
| Stem | Cannondale C3, 6061 Alloy, 1.5”, 31.8, -5°. |
| Saddle | Cannondale Stage 3 |
| Seatpost | Cannondale C3, 6061 alloy, 27.2x350mm (S,M) 400mm (L,X) |
Wheels & Tires
| Hubs | Formula DC51 front, Formula DC-1422 Ai Offset dish - Rear |
|---|---|
| Rims | WTB STP i19 Tubeless Ready |
| Spokes | DT Swiss Competition (Ai Offset dish - Rear) |
| Front Tire | Schwalbe Racing Ralph Performance 29/27.5x2.25” |
| Rear Tire | Schwalbe Racing Ralph Performance 29/27.5x2.25” |
| 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 Deore XT RD-M8230 Rear Derailleur Max 50t, Min 11t, 11-Speed
11-Speed
More parts (4)

Easton EA90 Seatpost Black/20mm Setback, 27.2x350mm
27.2x350mm
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 5 · 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: RockShox Reba RL, 100mm, Solo Air, Tapered Steerer, Maxle Lite, 51mm offset
Suspension
Evaluate the suspension →Archived: Fork: RockShox Reba RL, 100mm, Solo Air, Tapered Steerer, Maxle Lite, 51mm offset
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano SLX , 11-speed · Rear derailleur: Shimano XT, 11-speed Shadow Plus · Crankset: Cannondale Si, BB30 w/ Ai SpideRing, X-Sync®, 32t · Bottom bracket: Cannondale Alloy PressFit30 · Rear cogs: SunRace, 11-46, 11-speed · Chain: KMC X11, 11-speed
Brakes
Inspect the brakes →Archived: Brakes: Shimano Deore MT-500 hydro disc, 180/160mm (S-160/160mm)
Wheels and tires
Check wheels and tires →Archived: Wheel size: 27.5" · Rims: WTB STP i19 Tubeless Ready · Hubs: Formula DC51 front, Formula DC-1422 Ai Offset dish - Rear · Front tire: Schwalbe Racing Ralph Performance 29/27.5x2.25” · Rear tire: Schwalbe Racing Ralph Performance 29/27.5x2.25”
Controls and contact points
Archived: Headset: Cannondale HeadShok Si · Handlebar: Cannondale C3 flat, 6061 double-butted Alloy, 760mm · Stem: Cannondale C3, 6061 Alloy, 1.5”, 31.8, -5°. · Seatpost: Cannondale C3, 6061 alloy, 27.2x350mm (S,M) 400mm (L,X) · Saddle: Cannondale Stage 3
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.



