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2025 Kona Ouroboros

Original specifications: geometry for 6 published sizes.

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At a glance

Archive #900001002
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
Campaign
Original buildAluminum

Manufacturer catalog

Published sizes and colors

6 sizes · 1 color

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

485052545658

Published colors

Gloss Metallic Turismo Olive w/ Porsche Olive Decals

Frameset

Frame ConstructionKona 6061 Aluminum Butted
Frame MaterialAluminum
ForkSuntour GVX32 40mm travel, Tapered, 100x12mm

Drivetrain

ShiftersMicroshift Sword left dropper/brake and right brake/shifter
Rear DerailleurMicroshift Sword Long Cage w/Clutch
CranksetMicroshift Sword; Chainring: 40t 10sp narrow-wide
Bottom BracketProwheel PF86.5
CassetteMicroshift Sword 11-48t 10spd
ChainKMC X10

Brakes

BrakesBrake Calipers: TRP Spyre C; Front Brake Rotor: TRP 180mm; Rear Brake Rotor: TRP 180mm; Brake Levers: Microshift Sword

Cockpit & Contact Points

HeadsetFSA No.57B
HandlebarKona Gravel 20-degree flare, 48: 440mm; 50: 460mm; 52-54: 480mm; 56: 500mm; 58: 520mm
StemKona Gravel 6-degree rise, 48-52: 50mm; 54-58: 60mm
SaddleWTB Volt
SeatpostTranzX 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
RimsWTB ST I27 TCS 2.0
SpokesStainless Black 14g
Front TireMaxxis Ravager EXO TR 700x50c
Rear TireMaxxis Ravager EXO TR 700x50c

Geometry

6 sizes · 15 measurements

Frame measurements by size.

All geometry measurements6 sizes · 15 measurements
Measurement485052545658
Seat tube410 mm410 mm455 mm455 mm500 mm535 mm
Top tube532 mm547 mm559 mm578 mm595 mm616 mm
Head tube116 mm132 mm148 mm172 mm193 mm225 mm
Head-tube angle68.7°68.7°68.7°68.7°68.7°68.7°
Seat-tube angle74.2°73.7°73.2°72.7°72.2°71.7°
Chainstay / rear center445 mm445 mm445 mm445 mm445 mm445 mm
Wheelbase1060 mm1071 mm1082 mm1096 mm1108 mm1124 mm
Bottom-bracket drop69 mm69 mm69 mm66 mm66 mm66 mm
Bottom-bracket height296 mm296 mm296 mm299 mm299 mm299 mm
Reach372 mm377 mm382 mm386 mm391 mm396 mm
Stack566 mm581 mm598 mm616 mm636 mm666 mm
Standover height725 mm730 mm769 mm777 mm814 mm848 mm
Fork offset / rake51 mm51 mm51 mm51 mm51 mm51 mm
Front center624 mm635 mm646 mm659 mm671 mm687 mm
Fork length / axle-to-crown435 mm435 mm435 mm435 mm435 mm435 mm

Dimensions as recorded.

Gearing

Lower gears help on climbs. Higher gears suit higher speeds.

RPM

RPM = pedal turns per minute.

All published sizes40T · 11–48T · 10-speed
Lowest0.83:1 Highest3.64:1 Total range436%
Estimated speed At 90 RPM Lowest gear6.3 mph Highest gear27.7 mph

Rear tire: 700C×50.

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 other gearing

Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Your gearing setup
Gears

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Gear, dimension and cadence changes update results automatically.

Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.

Parts & serviceability

Find replacement parts

Original specifications
Front tire · Original
Maxxis Ravager EXO TR 700x50c
Retailer offers
Seatpost · Original
TranzX Dropper +RAD Internal 31.6mm 125mm travel
Retailer offers
Chain · Original
KMC X10
More parts (6)Fewer parts
Cassette · Original
Microshift Sword 11-48t 10spd
Saddle · Original
WTB Volt
Crankset · Original
Microshift Sword

Chainring: 40t 10sp narrow-wide

Rear derailleur · Original
Microshift Sword Long Cage w/Clutch
Headset · Original
FSA No.57B
Rims · Original
WTB ST i27 TCS 2.0

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
Maxxis Ravager EXO TR 700x50cCheck: Verify the fitted tire’s size marking and rim type.
Rear tire
Maxxis Ravager EXO TR 700x50cCheck: Verify the rear size; it may differ from the front.
Drivetrain
10-speedCheck: Match the installed drivetrain family, not just its speed count.
Seatpost diameter
31.6 mmCheck: Read the post’s diameter marking; seat-clamp size differs.
Bottom bracket / shell
Prowheel PF86.5Check: Verify shell type and width, crank interface, and spindle length or spacers.
Bike-specific inspection checklist 20 checks based on 6 archived component groups Open checklistClose checklist
0 of 20 checked Progress stays in this browser for this record.

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.

Archived: 2025 Kona Ouroboros · Cyclocross/Gravel · Published sizes: 48, 50, 52, 54, 56, 58

Archived: Frame: Kona 6061 Aluminum Butted · Fork: Suntour GVX32 40mm travel, Tapered, 100x12mm

Archived: Fork: Suntour GVX32 40mm travel, Tapered, 100x12mm

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

Archived: Brakes: Brake Calipers: TRP Spyre C; Front Brake Rotor: TRP 180mm; Rear Brake Rotor: TRP 180mm; Brake Levers: Microshift Sword

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

Follow the full used-bike inspection order →

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Gallery8 images

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Campaign

Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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