Velopedia Bicycle Archive
2020 Cannondale Jekyll 29 4
Original specifications: 29" wheels · geometry for 4 published sizes.
Selling this bike? Get the spec link and selling options
At a glance
- Model year
- 2020
- Category
- Mountain
- Sizes
- S, M, L, XL
- Colors
- Mantis (MAT)
- Geometry
- 4 manufacturer sizes
- In this record
- 23 specifications · archived image · geometry
- Archive ID
- 900003033
Original buildAluminum · 29"
Frameset
| Frame Construction | All-New, SmartForm C1 Alloy, 150mm travel, Ai offset drivetrain, ISCG05, BB30-83, flat mount brake, tapered headtube |
|---|---|
| Frame Material | Aluminum |
| Fork | RockShox Lyrik Select, 150mm, DebonAir, 15x110, tapered steerer, 42mm offset |
| Rear Shock | RockShox Deluxe Select Plus, DebonAir |
Drivetrain
| Shifters | SRAM NX Eagle, 12-speed |
|---|---|
| Rear Derailleur | SRAM NX Eagle |
| Crankset | Truvativ Stylo 6K DUB, 30T, Ai offset |
| Bottom Bracket | Cannondale BB30 |
| Rear Cogs | SRAM PG-1230, NX Eagle, 11-50, 12-speed |
| Chain | SRAM NX Eagle, 12-speed |
| Pedals | Not Included |
Brakes
| Brakes | Shimano MT500 hydro disc, 180/180mm RT66 rotors |
|---|
Cockpit & Contact Points
| Headset | Integrated, 1-1/8 to 1.5”, sealed angular contact bearings |
|---|---|
| Handlebar | Cannondale 3 Riser, 6061 Alloy, 15mm rise, 8° sweep, 4° rise, 780mm |
| Stem | Cannondale 3, 3D Forged 6061 Alloy, 1-1/8”, 31.8, 0° |
| Saddle | Fabric Scoop Shallow Sport, steel rails |
| Seatpost | Cannondale DownLow Dropper, internal routing, 31.6, 125mm (S), 150mm (M-XL) |
Wheels & Tires
| Hubs | Formula 15x110 Formula 12x148 w/ HG driver 12x148 |
|---|---|
| Rims | WTB ST i29 TCS, 32h, tubeless ready |
| Spokes | DT Swiss Champion |
| Front Tire | (F) Maxxis Minion DHF 29 x 2.5” WT, Dual compound, EXO puncture protection, tubeless ready (R) Maxxis Minion DHR II 29 x 2.4” WT, Dual compound, EXO puncture protection, tubeless ready |
| Rear Tire | (F) Maxxis Minion DHF 29 x 2.5” WT, Dual compound, EXO puncture protection, tubeless ready (R) Maxxis Minion DHR II 29 x 2.4” WT, Dual compound, EXO puncture protection, tubeless ready |
| Wheel Size | 29" |
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements4 sizes · 16 measurements
| Measurement | SM | MD | LG | XL |
|---|---|---|---|---|
| Seat tube | 400 mm | 430 mm | 460 mm | 520 mm |
| Effective top tube | 586 mm | 611 mm | 636 mm | 664 mm |
| Top tube | 568 mm | 589 mm | 613 mm | 641 mm |
| Head tube | 102 mm | 115 mm | 127 mm | 140 mm |
| Head-tube angle | 65° | 65° | 65° | 65° |
| Seat-tube angle | 75° | 75° | 75° | 75° |
| Chainstay / rear center | 442 mm | 442 mm | 442 mm | 442 mm |
| Wheelbase | 1179 mm | 1207 mm | 1234 mm | 1264 mm |
| Bottom-bracket drop | 16 mm | 16 mm | 16 mm | 16 mm |
| Bottom-bracket height | 360 mm | 360 mm | 360 mm | 360 mm |
| Reach | 419 mm | 440 mm | 462 mm | 487 mm |
| Stack | 598 mm | 610 mm | 621 mm | 633 mm |
| Standover height | 760 mm | 766 mm | 776 mm | 788 mm |
| Fork offset / rake | 42 mm | 42 mm | 42 mm | 42 mm |
| Front center | 738 mm | 765 mm | 792 mm | 823 mm |
| Trail | 130 mm | 130 mm | 130 mm | 130 mm |
Dimensions as recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM = pedal turns per minute.
Speed unavailable: wheel or tire size is missing or unclear.
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.
Parts & serviceability
Find replacement parts

SRAM XX1 Eagle 12-Speed Chain Copper, 126 links
126 links
Replacement option · verify fit
More parts (4)
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 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: 2020 Cannondale Jekyll 29 4 · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: All-New, SmartForm C1 Alloy, 150mm travel, Ai offset drivetrain, ISCG05, BB30-83, flat mount brake, tapered headtube · Fork: RockShox Lyrik Select, 150mm, DebonAir, 15x110, tapered steerer, 42mm offset
Suspension
Evaluate the suspension →Archived: Fork: RockShox Lyrik Select, 150mm, DebonAir, 15x110, tapered steerer, 42mm offset · Rear shock: RockShox Deluxe Select Plus, DebonAir
Drivetrain
Check drivetrain wear →Archived: Shifters: SRAM NX Eagle, 12-speed · Rear derailleur: SRAM NX Eagle · Crankset: Truvativ Stylo 6K DUB, 30T, Ai offset · Bottom bracket: Cannondale BB30 · Rear cogs: SRAM PG-1230, NX Eagle, 11-50, 12-speed · Chain: SRAM NX Eagle, 12-speed
Brakes
Inspect the brakes →Archived: Brakes: Shimano MT500 hydro disc, 180/180mm RT66 rotors
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29" · Rims: WTB ST i29 TCS, 32h, tubeless ready · Hubs: Formula 15x110 Formula 12x148 w/ HG driver 12x148
Controls and contact points
Archived: Headset: Integrated, 1-1/8 to 1.5”, sealed angular contact bearings · Handlebar: Cannondale 3 Riser, 6061 Alloy, 15mm rise, 8° sweep, 4° rise, 780mm · Stem: Cannondale 3, 3D Forged 6061 Alloy, 1-1/8”, 31.8, 0° · Seatpost: Cannondale DownLow Dropper, internal routing, 31.6, 125mm (S), 150mm (M-XL) · Saddle: Fabric Scoop Shallow Sport, steel rails · Pedals: Not Included
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.
