Velopedia Bicycle Archive
2025 Kona Unit X
Mountain bicycle from the Velopedia specification archive.
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What Velopedia knows
- Model year
- 2025
- Category
- Mountain
- Original MSRP
- $1,799.00
- Sizes
- S, M, L, XL
- Colors
- Gloss Metallic Gold w/ Black & Concrete Decals
- Geometry
- 4 manufacturer sizes · Geometry context
- Record coverage
- 23 preserved details · 8 archived images · original MSRP · preserved geometry
- Archive ID
- 900001150
Frameset
| Frame Construction | Reynolds 520 Butted Cromoly |
|---|---|
| Fork | Kona Plus Fork 110mm spacing |
| Rear Shock | n/a |
Drivetrain
| Shifters | Shimano Deore 12spd |
|---|---|
| Front Derailleur | n/a |
| Rear Derailleur | Shimano Deore |
| Crankset | Shimano Deore 12spd; Chainring: 32t |
| Bottom Bracket | Shimano 73mm |
| Cassette | Shimano Deore 10-51t 12spd |
| Chain | Shimano Deore 12spd |
| Pedals | n/a |
Brakes
| Brakes | Brake Calipers: Shimano MT410 Hydraulic; Front Brake Rotor: Shimano RT10 180mm (centerlock); Rear Brake Rotor: Shimano RT10 160mm (centerlock); Brake Levers: Shimano MT410 Hydraulic |
|---|
Cockpit & Contact Points
| Headset | TH ZST no.10 |
|---|---|
| Handlebar | Kona XC/BC Riser |
| Stem | Kona XC/BC |
| Saddle | WTB Volt |
| Seatpost | Kona Thumb w/Offset 31.6mm |
Wheels & Tires
| Hubs | (F) Formula 110x15mm (centerlock) / (R) Shimano 148x12mm (centerlock) |
|---|---|
| Rims | WTB ST I30 2.0 TCS |
| Spokes | Stainless Black 14g |
| Front Tire | Maxxis Rekon TR 29x2.6" or WTB Ranger TCS 29x2.6" |
| Rear Tire | Maxxis Rekon TR 29x2.6" or WTB Ranger TCS 29x2.6" |
| Wheel Size | 29" |
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 | S | M | L | XL |
|---|---|---|---|---|
| Seat tube | 370 mm | 420 mm | 470 mm | 530 mm |
| Top tube | 582 mm | 610 mm | 637 mm | 675 mm |
| Head tube | 110 mm | 120 mm | 130 mm | 140 mm |
| Head-tube angle | 68° | 68° | 68° | 68° |
| Seat-tube angle | 75° | 75° | 75° | 75° |
| Chainstay / rear center | 430 mm | 430 mm | 430 mm | 430 mm |
| Wheelbase | 1115 mm | 1144 mm | 1173 mm | 1211 mm |
| Bottom-bracket drop | 65 mm | 65 mm | 65 mm | 65 mm |
| Bottom-bracket height | 310 mm | 310 mm | 310 mm | 310 mm |
| Reach | 425 mm | 450 mm | 475 mm | 510 mm |
| Stack | 588 mm | 597 mm | 606 mm | 615 mm |
| Standover height | 695 mm | 731 mm | 768 mm | 810 mm |
| Fork offset / rake | 50 mm | 50 mm | 50 mm | 50 mm |
| Front center | 693 mm | 722 mm | 750 mm | 789 mm |
| Fork length / axle-to-crown | 470 mm | 470 mm | 470 mm | 470 mm |
Geometry source: Manufacturer HTML geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
S geometry
Archive context: Its bottom-bracket drop of 65 mm sits toward the deeper-drop end. Its wheelbase of 1115 mm sits toward the shorter end. Its stack of 588 mm sits toward the lower end.
Compared with 180 distinct mountain 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 S geometry M geometry
Archive context: Its bottom-bracket drop of 65 mm sits toward the deeper-drop end. Its stack of 597 mm sits toward the lower end. Its wheelbase of 1144 mm sits toward the shorter end.
Compared with 186 distinct mountain 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 M geometry L geometry
Archive context: Its bottom-bracket drop of 65 mm sits toward the deeper-drop end. Its stack of 606 mm sits toward the lower end. The head angle of 68° sits toward the steeper end.
Compared with 179 distinct mountain 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 L geometry XL geometry
Archive context: Its bottom-bracket drop of 65 mm sits toward the deeper-drop end. Its stack of 615 mm sits toward the lower end. The head angle of 68° sits toward the steeper end.
Compared with 158 distinct mountain 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 XL geometry Parts & serviceability
Find replacement parts
ChainShimano Deore 12spdComponent family — verify exact version
CassetteShimano Deore 10-51t 12spdComponent family — verify exact version
SaddleWTB VoltNamed archived component — verify exact version
More qualified parts (4)
CranksetShimano Deore 12spd; Chainring: 32tComponent family — verify exact version
Rear derailleurShimano DeoreNamed component · published drivetrain speed — verify exact version
ShiftersShimano Deore 12spdComponent family — verify exact version
RimsWTB ST I30 2.0 TCSNamed archived component — verify dimensions
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 →- FrameCheck paint chips, vent holes and the inside of the seat tube for corrosion. Also look for dents, bent tubes and cracking around welded or brazed joints.Inspect the frame and fork →
- BrakesIdentify the installed brake system before riding or ordering parts. Test every installed brake separately at walking speed, confirm it stops firmly and releases cleanly, then inspect its pads, braking surfaces and complete cable or hose path.Inspect the brakes →
- DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 12-speed system.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 →
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 Kona Unit X · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Reynolds 520 Butted Cromoly · Fork: Kona Plus Fork 110mm spacing
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano Deore 12spd · Rear derailleur: Shimano Deore · Crankset: Shimano Deore 12spd; Chainring: 32t · Bottom bracket: Shimano 73mm · Cassette: Shimano Deore 10-51t 12spd · Chain: Shimano Deore 12spd
Brakes
Inspect the brakes →Archived: Brakes: Brake Calipers: Shimano MT410 Hydraulic; Front Brake Rotor: Shimano RT10 180mm (centerlock); Rear Brake Rotor: Shimano RT10 160mm (centerlock); Brake Levers: Shimano MT410 Hydraulic
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29" · Rims: WTB ST i30 2.0 TCS · Hubs: (F) Formula 110x15mm (centerlock) / (R) Shimano 148x12mm (centerlock) · Front tire: Maxxis Rekon TR 29x2.6" or WTB Ranger TCS 29x2.6" · Rear tire: Maxxis Rekon TR 29x2.6" or WTB Ranger TCS 29x2.6"
Controls and contact points
Archived: Headset: TH ZST No.10 · Handlebar: Kona XC/BC Riser · Stem: Kona XC/BC · Seatpost: Kona Thumb w/Offset 31.6mm · Saddle: WTB Volt
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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Gallery
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.