Rear tire: 700C×25.
Velopedia Bicycle Archive
2021 Cannondale CAAD Optimo 1
Original specifications: 700c wheels · geometry for 5 published sizes.
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At a glance
Archive #900004778- Model year
- 2021
- Category
- Road
- Sizes
- 48, 51, 54, 56, 58
- Colors
- Candy Red (CRD), Alpine (ALP)
- Geometry
- 5 manufacturer sizes
- In this record
- 23 specifications · archived image · geometry
Original buildAluminum · 700c
Frameset
| Frame Construction | All-New SmartForm C2 Alloy, SAVE, tapered headtube, fender mounts, 130x9mm QR |
|---|---|
| Frame Material | Aluminum |
| Fork | BallisTec Full Carbon, 1-1/8” to 1-1/4” steerer, fender mounts, 100x9mm QR |
Drivetrain
| Shifters | Shimano 105, 11-speed |
|---|---|
| Front Derailleur | Shimano 105, 31.8 clamp |
| Rear Derailleur | Shimano 105 GS |
| Crankset | FSA Gossamer Alloy, 50/34 |
| Bottom Bracket | FSA MegaExo |
| Rear Cogs | Shimano 105, 11-30, 11-speed |
| Chain | KMC X11, 11-speed |
| Pedals | Wellgo w/ Clip and Strap |
Brakes
| Brakes | Tektro R741 |
|---|
Cockpit & Contact Points
| Headset | CAAD Optimo, 1-1/8” to 1-1/4”, 25mm top cap |
|---|---|
| Handlebar | Cannondale 3, 6061 alloy, Compact |
| Stem | Cannondale 3, 6061 Alloy, 31.8, 7° |
| Saddle | Cannondale Stage CX |
| Seatpost | Cannondale 3, 6061 Alloy, 27.2 x 350mm |
Wheels & Tires
| Hubs | (F) Formula RB-56 (R) Formula RB-5711 |
|---|---|
| Rims | RS 2.0, 24h front, 28h rear |
| Spokes | Stainless Steel, 14g |
| Front Tire | Vittoria Zaffiro Pro Slick, 700c x 25c |
| Rear Tire | Vittoria Zaffiro Pro Slick, 700c x 25c |
| Wheel Size | 700c |
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 measurements5 sizes · 16 measurements
| Measurement | 48 | 51 | 54 | 56 | 58 |
|---|---|---|---|---|---|
| Seat tube | 440 mm | 467 mm | 495 mm | 522 mm | 549 mm |
| Effective top tube | 520 mm | 530 mm | 546 mm | 562 mm | 578 mm |
| Head tube | 108 mm | 121 mm | 144 mm | 165 mm | 189 mm |
| Head-tube angle | 71.9° | 72.6° | 72.6° | 72.6° | 72.6° |
| Seat-tube angle | 74.3° | 74° | 73.7° | 73.3° | 72.9° |
| Chainstay / rear center | 415 mm | 415 mm | 415 mm | 415 mm | 415 mm |
| Wheelbase | 978 mm | 980 mm | 994 mm | 1006 mm | 1019 mm |
| Bottom-bracket drop | 74 mm | 74 mm | 72 mm | 72 mm | 69 mm |
| Bottom-bracket height | 268 mm | 268 mm | 270 mm | 270 mm | 273 mm |
| Reach | 374 mm | 377 mm | 384 mm | 390 mm | 395 mm |
| Stack | 520 mm | 535 mm | 555 mm | 575 mm | 595 mm |
| Standover height | 709 mm | 731 mm | 758 mm | 782 mm | 808 mm |
| Fork offset / rake | 48 mm | 48 mm | 48 mm | 48 mm | 48 mm |
| Front center | 575 mm | 576 mm | 590 mm | 602 mm | 614 mm |
| Trail | 61 mm | 57 mm | 57 mm | 57 mm | 57 mm |
| Wheel size | 700c | 700c | 700c | 700c | 700c |
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.
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
700c x 25c

Vittoria Zaffiro Pro V Clincher Tire Black, 700x25
700x25c
Replacement option
6061 Alloy, 27.2 x 350mm

Race Face Ride XC Seatpost Black, 27.2x375mm
Replacement option
More parts (9)Fewer parts
11-30, 11-speed
50/34
31.8 clamp
Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.11-speed
Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.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
- Vittoria Zaffiro Pro Slick, 700c x 25cCheck: Verify the fitted tire’s size marking and rim type.
- Rear tire
- Vittoria Zaffiro Pro Slick, 700c x 25cCheck: 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
- 27.2 mmCheck: Read the post’s diameter marking; seat-clamp size differs.
- Bottom bracket / shell
- FSA MegaExoCheck: Verify shell type and width, crank interface, and spindle length or spacers.
Bike-specific inspection checklist 19 checks based on 5 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: 2021 Cannondale CAAD Optimo 1 · Road · Published sizes: 48, 51, 54, 56, 58
Frame and fork
Inspect the frame and fork →Archived: Frame: All-New SmartForm C2 Alloy, SAVE, tapered headtube, fender mounts, 130x9mm QR · Fork: BallisTec Full Carbon, 1-1/8” to 1-1/4” steerer, fender mounts, 100x9mm QR
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano 105, 11-speed · Front derailleur: Shimano 105, 31.8 clamp · Rear derailleur: Shimano 105 GS · Crankset: FSA Gossamer Alloy, 50/34 · Bottom bracket: FSA MegaExo · Rear cogs: Shimano 105, 11-30, 11-speed · Chain: KMC X11, 11-speed
Brakes
Inspect the brakes →Archived: Brakes: Tektro R741
Wheels and tires
Check wheels and tires →Archived: Wheel size: 700c · Rims: RS 2.0, 24h front, 28h rear · Hubs: (F) Formula RB-56 (R) Formula RB-5711 · Front tire: Vittoria Zaffiro Pro Slick, 700c x 25c · Rear tire: Vittoria Zaffiro Pro Slick, 700c x 25c
Controls and contact points
Archived: Headset: CAAD Optimo, 1-1/8” to 1-1/4”, 25mm top cap · Handlebar: Cannondale 3, 6061 alloy, Compact · Stem: Cannondale 3, 6061 Alloy, 31.8, 7° · Seatpost: Cannondale 3, 6061 Alloy, 27.2 x 350mm · Saddle: Cannondale Stage CX · Pedals: Wellgo w/ Clip and Strap
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.





