B-Grade Cannondale Synapse Carbon 4 Chalk 51cm 105 Di2 Disc Brake Road Bike
New other (see details) · Fixed price · offers accepted · USD 3600.00
Velopedia Bicycle Archive
2025 Cannondale Synapse Carbon 4
Original manufacturer specifications including 700c wheels, geometry for 7 published sizes.
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What Velopedia knows
- Model year
- 2025
- Category
- Road
- Original MSRP
- $4,199.00
- Sizes
- 44, 48, 51, 54, 56, 58, 61
- Colors
- Metallic Red, Chalk
- Geometry
- 7 manufacturer sizes · Geometry context
- Record coverage
- 23 preserved details · archived image · original MSRP · preserved geometry
- Archive ID
- 900000147
Model history 2 other years
Frameset
| Frame Construction | Synapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport, 12x142 thru-axle, UDH, BSA 68mm threaded BB, flat mount disc, integrated seat binder, SmartSense Gen 2.0 compatible, fender mounts |
|---|---|
| Frame Material | Carbon fiber |
| Fork | Synapse Carbon, integrated crown race, 12x100mm thru-axle, flat mount disc, internal routing, 1-1/8" to 1-1/5" Delta steerer, 55mm offset, fender mounts |
| Fork Material | Carbon fiber |
Drivetrain
| Shifters | Shimano 105 Di2 R7170, wireless, 12-speed |
|---|---|
| Front Derailleur | Shimano 105 Di2 7150, braze-on |
| Rear Derailleur | Shimano 105 Di2 7150 |
| Crankset | Shimano 105 7100, BSA, 50/34: 165mm (44cm), 170mm (48-51cm), 172.5 (54-56cm), 175mm (58-61) |
| Bottom Bracket | Shimano BSA 68 |
| Rear Cogs | Shimano 105 7100, 11-34, 12-speed |
| Chain | Shimano 105 7100, 12-speed |
Brakes
| Brakes | Brakes Shimano 105 7170 hydraulic disc, 160/160mm RT70 rotors Brake Levers Shimano 105 Di2 7170 hydraulic disc |
|---|
Cockpit & Contact Points
| Headset | Integrated, 1-1/8" - 1-1/2" |
|---|---|
| Handlebar | Vision Trimax Aero Alloy: 400mm (44-51cm), 420mm (54-61cm) |
| Stem | Cannondale C1 Conceal, Alloy, 31.8, -6°: 80mm (44-48m), 90mm (51cm), 100mm (54-56cm), 110mm (58-61cm) |
| Saddle | Fizik Vento Argo X5, 140mm |
| Seatpost | Cannondale C1 Aero 27 Carbon, SmartSense compatible, 330mm length, 0mm offset (44-48cm), 15mm offset (51-61cm) |
Wheels & Tires
| Hubs | (F) Shimano RS470, 12x100mm centerlock / (R) Shimano RS470, 12x142mm centerlock |
|---|---|
| Rims | DT Swiss R470 DB, 28h |
| Spokes | Stainless Steel, 14g |
| Front Tire | Vittoria Rubino Pro IV, 700x32c |
| Rear Tire | Vittoria Rubino Pro IV, 700x32c |
| Wheel Size | 700c |
Size-specific frame data
Geometry
Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.
| Measurement | 44 | 48 | 51 | 54 | 56 | 58 | 61 |
|---|---|---|---|---|---|---|---|
| Seat tube | 407 mm | 407 mm | 443 mm | 480 mm | 520 mm | 550 mm | 590 mm |
| Effective top tube | 522 mm | 533 mm | 544 mm | 555 mm | 567 mm | 580 mm | 598 mm |
| Top tube | 478 mm | 486 mm | 497 mm | 509 mm | 523 mm | 537 mm | 556 mm |
| Head tube | 91 mm | 108 mm | 127 mm | 150 mm | 171 mm | 196 mm | 227 mm |
| Head-tube angle | 69.8° | 70.9° | 71.3° | 71.3° | 71.3° | 71.3° | 71.3° |
| Seat-tube angle | 73° | 73° | 73° | 73° | 73° | 73° | 73° |
| Chainstay / rear center | 425 mm | 425 mm | 425 mm | 425 mm | 430 mm | 430 mm | 430 mm |
| Wheelbase | 1003 mm | 1005 mm | 1013 mm | 1026 mm | 1044 mm | 1058 mm | 1077 mm |
| Bottom-bracket drop | 75 mm | 75 mm | 75 mm | 73 mm | 73 mm | 70 mm | 70 mm |
| Bottom-bracket height | 278 mm | 278 mm | 278 mm | 280 mm | 280 mm | 283 mm | 283 mm |
| Reach | 366 mm | 371 mm | 376 mm | 381 mm | 387 mm | 393 mm | 402 mm |
| Stack | 510 mm | 530 mm | 550 mm | 570 mm | 590 mm | 610 mm | 640 mm |
| Standover height | 714 mm | 722 mm | 752 mm | 785 mm | 815 mm | 843 mm | 878 mm |
| Fork offset / rake | 55 mm | 55 mm | 55 mm | 55 mm | 55 mm | 55 mm | 55 mm |
| Front center | 589 mm | 592 mm | 600 mm | 612 mm | 624 mm | 638 mm | 657 mm |
| Trail | 71 mm | 64 mm | 61 mm | 61 mm | 61 mm | 61 mm | 61 mm |
| Fork length / axle-to-crown | 393 mm | 393 mm | 393 mm | 393 mm | 393 mm | 393 mm | 393 mm |
| Wheel size | 700c | 700c | 700c | 700c | 700c | 700c | 700c |
Geometry source: Exact published geometry image match ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
44 geometry
Archive context: The seat angle of 73° sits toward the more relaxed end. The head angle of 69.8° sits toward the slacker end. The chainstay of 425 mm sits toward the longer rear-center end.
Compared with 64 distinct road geometries in the XS-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze 44 geometry 48 geometry
Archive context: The seat angle of 73° sits toward the more relaxed end. The head angle of 70.9° sits toward the slacker end. The chainstay of 425 mm sits toward the longer rear-center end.
Compared with 88 distinct road geometries in the Small-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze 48 geometry 51 geometry
Archive context: The seat angle of 73° sits toward the more relaxed end. Its wheelbase of 1013 mm sits toward the longer end. The chainstay of 425 mm sits toward the longer rear-center end.
Compared with 88 distinct road geometries in the Small-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze 51 geometry 54 geometry
Archive context: The seat angle of 73° sits toward the more relaxed end. Its wheelbase of 1026 mm sits toward the longer end. The chainstay of 425 mm sits toward the longer rear-center end.
Compared with 89 distinct road geometries in the Medium-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze 54 geometry 56 geometry
Archive context: The head angle of 71.3° sits toward the slacker end. The chainstay of 430 mm sits toward the longer rear-center end. The seat angle of 73° sits toward the more relaxed end.
Compared with 77 distinct road geometries in the Large-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze 56 geometry 58 geometry
Archive context: The head angle of 71.3° sits toward the slacker end. The chainstay of 430 mm sits toward the longer rear-center end. Its trail of 61 mm sits toward the higher-trail end.
Compared with 63 distinct road geometries in the XL-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze 58 geometry 61 geometry
Archive context: The chainstay of 430 mm sits toward the longer rear-center end. The head angle of 71.3° sits toward the slacker end. Its wheelbase of 1077 mm sits toward the longer end.
Compared with 39 distinct road geometries in the XXL-equivalent size cohort from model years 2023–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze 61 geometry Parts & serviceability
Find replacement parts
Shimano 105 7100, 12-speed
Interpreted as Shimano 105 · 12-speed Component family — verify exact version
Shimano 105 7100, 11-34, 12-speed
Interpreted as Shimano 105 · 12-speed Component family — verify exact version
Vittoria Rubino Pro IV, 700x32c
Named tire and published size
More qualified parts (6)
Shimano BSA 68
Named archived component — verify dimensions
Fizik Vento Argo X5, 140mm
Named archived component — verify exact version
Shimano 105 7100, BSA, 50/34: 165mm (44cm), 170mm (48-51cm), 172.5 (54-56cm), 175mm (58-61)
Component family — verify exact version
Shimano 105 Di2 7150, braze-on
Interpreted as Shimano 105 · 12-speed · Di2 Component family — verify exact version
Shimano 105 Di2 7150
Interpreted as Shimano 105 · 12-speed · Di2 Component family — verify exact version
Shimano 105 Di2 R7170, wireless, 12-speed
Interpreted as Shimano 105 · 12-speed · Di2 Component family — verify exact version
Searches use the archived manufacturer specification, not the components currently installed on a particular bicycle. Confirm the exact model, size and fit before ordering. 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. Commercial relationships do not influence Archive specifications or analysis.
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- FrameInspect the frame in bright light, especially around the head tube, bottom bracket, chainstays and clamped areas. Look for cracks, ripples, crushed sections or signs of a previous impact.Inspect the frame and fork →
- BrakesBoth levers should feel firm and return cleanly. Check for fluid around the levers and calipers, inspect pad thickness and contamination, and look for worn or bent rotors.Inspect the brakes →
- DrivetrainConfirm every shift-system battery charges, every shift control works and the derailleur moves cleanly across the cassette. Make sure the matching shift-system charger is included, then measure chain wear and inspect the cassette teeth.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads.Check wheels and tires →
- Bottom bracketTurn the cranks slowly, feel for rough bearings and check for side-to-side play. Creaking under load deserves investigation but does not identify the source by itself.Inspect the bottom bracket and shell →
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: 2025 Cannondale Synapse Carbon 4 · Road · Published sizes: 44, 48, 51, 54, 56, 58, 61
Frame and fork
Inspect the frame and fork →Archived: Frame: Synapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport, 12x142 thru-axle, UDH, BSA 68mm threaded BB, flat mount disc, integrated seat binder, SmartSense Gen 2.0 compatible, fender mounts · Fork: Synapse Carbon, integrated crown race, 12x100mm thru-axle, flat mount disc, internal routing, 1-1/8" to 1-1/5" Delta steerer, 55mm offset, fender mounts · Carbon fiber
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano 105 Di2 R7170, wireless, 12-speed · Front derailleur: Shimano 105 Di2 7150, braze-on · Rear derailleur: Shimano 105 Di2 7150 · Crankset: Shimano 105 7100, BSA, 50/34: 165mm (44cm), 170mm (48-51cm), 172.5 (54-56cm), 175mm (58-61) · Bottom bracket: Shimano BSA 68 · Rear cogs: Shimano 105 7100, 11-34, 12-speed · Chain: Shimano 105 7100, 12-speed
Brakes
Inspect the brakes →Archived: Brakes: Brakes Shimano 105 7170 hydraulic disc, 160/160mm RT70 rotors Brake Levers Shimano 105 Di2 7170 hydraulic disc
Wheels and tires
Check wheels and tires →Archived: Wheel size: 700c · Rims: DT Swiss R470 DB, 28h · Hubs: (F) Shimano RS470, 12x100mm centerlock / (R) Shimano RS470, 12x142mm centerlock · Front tire: Vittoria Rubino Pro IV, 700x32c · Rear tire: Vittoria Rubino Pro IV, 700x32c
Controls and contact points
Archived: Headset: Integrated, 1-1/8" - 1-1/2" · Handlebar: Vision Trimax Aero Alloy: 400mm (44-51cm), 420mm (54-61cm) · Stem: Cannondale C1 Conceal, Alloy, 31.8, -6°: 80mm (44-48m), 90mm (51cm), 100mm (54-56cm), 110mm (58-61cm) · Seatpost: Cannondale C1 Aero 27 Carbon, SmartSense compatible, 330mm length, 0mm offset (44-48cm), 15mm offset (51-61cm) · Saddle: Fizik Vento Argo X5, 140mm
Before and during the test ride
Follow the full used-bike inspection order →Build relationships are limited to the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Recently checked marketplace data
Market Snapshot
Velopedia did not find a close used eBay listing in the latest snapshot. New and used listings remain separate.
Evidence standard
Fixed-price and Best Offer item prices only
Shipping and tax excluded
Active asks, not completed sales
Model-year coverage: 0 of 2 qualifying asking-price listings explicitly state 2025. There are not yet three year-confirmed used listings, so the used summary is labeled as broader model-family context.
Affiliate disclosure: As an eBay Partner, Velopedia may be compensated if you make a purchase through these links.
Qualified asking evidence22 high-confidence matches
Model-family used askingNo listingsNo close used matches in the latest snapshot.
Model-family new asking$3,462.50Median asking · limited sample · 2 listings
cannondale synapse Carbon 4
New · Fixed price · offers accepted · USD 3325.00
See all current matches for this bicycle →
Listings shown have not passed their eBay-supplied end time. Velopedia rechecks matched bicycles on a protected weekly cycle; availability can still change between checks. Price calculations use active fixed-price and Best Offer item prices before shipping and tax. Auction bids, auction-only prices, classified ads, lower-confidence Review candidates and ended listings are excluded. These observations are not completed-sale prices, a certified appraisal or a guarantee of value.
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.