6.3–27.7 mph at 90 rpm, estimated from the published rear tire size 700×50c · 50-622 ETRTO.
Velopedia Bicycle Archive
2025 Kona Ouroboros
Original specifications: geometry for 6 published sizes.
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At a glance
- Model year
- 2025
- Category
- Gravel & Cyclocross
- Original MSRP
- $2,099.00
- Sizes
- 48, 50, 52, 54, 56, 58
- Colors
- Gloss Metallic Turismo Olive w/ Porsche Olive Decals
- Geometry
- 6 manufacturer sizes
- In this record
- 20 specifications · 8 archived images · original MSRP · geometry
- Archive ID
- 900001002
Original buildAluminum
Frameset
| Frame Construction | Kona 6061 Aluminum Butted |
|---|---|
| Frame Material | Aluminum |
| Fork | Suntour GVX32 40mm travel, Tapered, 100x12mm |
Drivetrain
| Shifters | Microshift Sword left dropper/brake and right brake/shifter |
|---|---|
| Rear Derailleur | Microshift Sword Long Cage w/Clutch |
| Crankset | Microshift Sword; Chainring: 40t 10sp narrow-wide |
| Bottom Bracket | Prowheel PF86.5 |
| Cassette | Microshift Sword 11-48t 10spd |
| Chain | KMC X10 |
Brakes
| Brakes | Brake Calipers: TRP Spyre C; Front Brake Rotor: TRP 180mm; Rear Brake Rotor: TRP 180mm; Brake Levers: Microshift Sword |
|---|
Cockpit & Contact Points
| Headset | FSA No.57B |
|---|---|
| Handlebar | Kona Gravel 20-degree flare, 48: 440mm; 50: 460mm; 52-54: 480mm; 56: 500mm; 58: 520mm |
| Stem | Kona Gravel 6-degree rise, 48-52: 50mm; 54-58: 60mm |
| Saddle | WTB Volt |
| Seatpost | TranzX Dropper +RAD Internal 31.6mm 125mm travel |
Wheels & Tires
| Hubs | (F) Formula 100x12mm 6-bolt / (R) Formula 142x12mm 6-bolt, standard road 11sp freehub body |
|---|---|
| Rims | WTB ST I27 TCS 2.0 |
| Spokes | Stainless Black 14g |
| Front Tire | Maxxis Ravager EXO TR 700x50c |
| Rear Tire | Maxxis Ravager EXO TR 700x50c |
Geometry
Frame measurements by size.
Published frame view
Select an available measurement to locate it on the frame.
All geometry measurements6 sizes · 15 measurements
| Measurement | 48 | 50 | 52 | 54 | 56 | 58 |
|---|---|---|---|---|---|---|
| Seat tube | 410 mm | 410 mm | 455 mm | 455 mm | 500 mm | 535 mm |
| Top tube | 532 mm | 547 mm | 559 mm | 578 mm | 595 mm | 616 mm |
| Head tube | 116 mm | 132 mm | 148 mm | 172 mm | 193 mm | 225 mm |
| Head-tube angle | 68.7° | 68.7° | 68.7° | 68.7° | 68.7° | 68.7° |
| Seat-tube angle | 74.2° | 73.7° | 73.2° | 72.7° | 72.2° | 71.7° |
| Chainstay / rear center | 445 mm | 445 mm | 445 mm | 445 mm | 445 mm | 445 mm |
| Wheelbase | 1060 mm | 1071 mm | 1082 mm | 1096 mm | 1108 mm | 1124 mm |
| Bottom-bracket drop | 69 mm | 69 mm | 69 mm | 66 mm | 66 mm | 66 mm |
| Bottom-bracket height | 296 mm | 296 mm | 296 mm | 299 mm | 299 mm | 299 mm |
| Reach | 372 mm | 377 mm | 382 mm | 386 mm | 391 mm | 396 mm |
| Stack | 566 mm | 581 mm | 598 mm | 616 mm | 636 mm | 666 mm |
| Standover height | 725 mm | 730 mm | 769 mm | 777 mm | 814 mm | 848 mm |
| Fork offset / rake | 51 mm | 51 mm | 51 mm | 51 mm | 51 mm | 51 mm |
| Front center | 624 mm | 635 mm | 646 mm | 659 mm | 671 mm | 687 mm |
| Fork length / axle-to-crown | 435 mm | 435 mm | 435 mm | 435 mm | 435 mm | 435 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

Maxxis Rambler Tubeless Tire Black/Tan, Dual-EXO, 700x50
700x50
Replacement option · verify fit
More parts (6)

KS Lev Integra Dropper Seatpost Black, 31.6mm, 125mm
31.6mm, 125mm
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 20 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: 2025 Kona Ouroboros · Cyclocross/Gravel · Published sizes: 48, 50, 52, 54, 56, 58
Frame and fork
Inspect the frame and fork →Archived: Frame: Kona 6061 Aluminum Butted · Fork: Suntour GVX32 40mm travel, Tapered, 100x12mm
Suspension
Evaluate the suspension →Archived: Fork: Suntour GVX32 40mm travel, Tapered, 100x12mm
Drivetrain
Check drivetrain wear →Archived: Shifters: Microshift Sword left dropper/brake and right brake/shifter · Rear derailleur: Microshift Sword Long Cage w/Clutch · Crankset: Microshift Sword; Chainring: 40t 10sp narrow-wide · Bottom bracket: Prowheel PF86.5 · Cassette: Microshift Sword 11-48t 10spd · Chain: KMC X10
Brakes
Inspect the brakes →Archived: Brakes: Brake Calipers: TRP Spyre C; Front Brake Rotor: TRP 180mm; Rear Brake Rotor: TRP 180mm; Brake Levers: Microshift Sword
Wheels and tires
Check wheels and tires →Archived: Rims: WTB ST i27 TCS 2.0 · Hubs: (F) Formula 100x12mm 6-bolt / (R) Formula 142x12mm 6-bolt, standard road 11sp freehub body · Front tire: Maxxis Ravager EXO TR 700x50c · Rear tire: Maxxis Ravager EXO TR 700x50c
Controls and contact points
Archived: Headset: FSA No.57B · Handlebar: Kona Gravel 20-degree flare, 48: 440mm; 50: 460mm; 52-54: 480mm; 56: 500mm; 58: 520mm · Stem: Kona Gravel 6-degree rise, 48-52: 50mm; 54-58: 60mm · Seatpost: TranzX Dropper +RAD Internal 31.6mm 125mm travel · Saddle: WTB Volt
Before and during the test ride
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Gallery8 images
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.




