
Velopedia Bicycle Archive
2021 Kona Fire Mountain
Original manufacturer specifications including 26" wheels, geometry for 5 published sizes.
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What Velopedia knows
- Model year
- 2021
- Category
- Mountain
- Original MSRP
- $799.00
- Sizes
- XS (26"), S, M, L, XL
- Colors
- Matt Blood Orange or Matt Faux Raw w/ Gloss Metallic Blue & Black Decals
- Geometry
- 5 manufacturer sizes · Geometry context
- Record coverage
- 24 preserved details · 2 archived images · original MSRP · preserved geometry
- Archive ID
- 900001981
Model history 21 other years
Frameset
| Frame Construction | Kona 6061 Aluminum Butted |
|---|---|
| Frame Material | Aluminum |
| Fork | Suntour XCR 32 LO-R Coil Spring 100mm |
| Rear Shock | n/a |
Drivetrain
| Shifters | Microshift Advent |
|---|---|
| Front Derailleur | n/a |
| Rear Derailleur | Microshift Advent w/ Clutch |
| Crankset | Samox; Chainring: 28t |
| Bottom Bracket | FSA 7420 73mm |
| Cassette | Microshift Advent 11-46t 9spd |
| Chain | KMC X9 |
| Pedals | Kona JS2 |
Brakes
| Brakes | Brake Calipers: Tektro HDM275; Front Brake Rotor: Tektro TR180 180mm; Rear Brake Rotor: Tektro TR160 160mm; Brake Levers: Tektro HDM275 |
|---|
Cockpit & Contact Points
| Headset | FSA No.57B |
|---|---|
| Handlebar | Kona Aluminum Riser |
| Stem | Kona Control |
| Saddle | Kona XC |
| Seatpost | Kona Thumb w/Offset 31.6mm |
Wheels & Tires
| Hubs | (F) Joytech 100x9mm / (R) Joytech 135x10mm |
|---|---|
| Rims | Alex DP27K |
| Spokes | Stainless Black 14g |
| Front Tire | WTB Trail Boss 27.5/26x2.25" |
| Rear Tire | WTB Trail Boss 27.5/26x2.25" |
| Wheel Size | 26" |
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 | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Seat tube | 331 mm | 370 mm | 420 mm | 470 mm | 530 mm |
| Top tube | 549 mm | 572 mm | 600 mm | 628 mm | 667 mm |
| Head tube | 100 mm | 100 mm | 115 mm | 125 mm | 140 mm |
| Head-tube angle | 67.5° | 68° | 68° | 68° | 68° |
| Seat-tube angle | 75° | 75° | 75° | 75° | 75° |
| Chainstay / rear center | 425 mm | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1085 mm | 1109 mm | 1139 mm | 1168 mm | 1208 mm |
| Bottom-bracket drop | 30 mm | 50 mm | 50 mm | 50 mm | 50 mm |
| Bottom-bracket height | 303 mm | 304 mm | 304 mm | 304 mm | 304 mm |
| Reach | 400 mm | 415 mm | 440 mm | 465 mm | 500 mm |
| Stack | 556 mm | 585 mm | 599 mm | 608 mm | 622 mm |
| Standover height | 675 mm | 710 mm | 718 mm | 724 mm | 747 mm |
| Fork offset / rake | 40 mm | 42 mm | 42 mm | 42 mm | 42 mm |
| Front center | 662 mm | 678 mm | 709 mm | 737 mm | 778 mm |
| Fork length / axle-to-crown | 483 mm | 490 mm | 490 mm | 490 mm | 490 mm |
Geometry source: Kona first-party archive metric geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
XS geometry
Archive context: Its stack of 556 mm sits toward the lower end. The chainstay of 425 mm sits toward the shorter rear-center end. Its bottom-bracket drop of 30 mm sits somewhat shallower than typical.
Compared with 22 distinct mountain geometries in the XS-equivalent size cohort from model years 2020–2023 in the Velopedia archive.S geometry
Archive context: Its stack of 585 mm sits toward the lower end. Its wheelbase of 1109 mm sits toward the shorter end. The head angle of 68° sits somewhat steeper than typical.
Compared with 86 distinct mountain geometries in the Small-equivalent size cohort from model years 2019–2023 in the Velopedia archive.M geometry
Archive context: Its stack of 599 mm sits toward the lower end. Its wheelbase of 1139 mm sits toward the shorter end. The head angle of 68° sits somewhat steeper than typical.
Compared with 86 distinct mountain geometries in the Medium-equivalent size cohort from model years 2019–2023 in the Velopedia archive.L geometry
Archive context: Its stack of 608 mm sits toward the lower end. Its wheelbase of 1168 mm sits toward the shorter end. The head angle of 68° sits somewhat steeper than typical.
Compared with 79 distinct mountain geometries in the Large-equivalent size cohort from model years 2019–2023 in the Velopedia archive.XL geometry
Archive context: Its stack of 622 mm sits toward the lower end. The head angle of 68° sits somewhat steeper than typical. Its wheelbase of 1208 mm sits somewhat shorter than typical.
Compared with 71 distinct mountain geometries in the XL-equivalent size cohort from model years 2019–2023 in the Velopedia archive.Parts & serviceability
Find replacement parts
More qualified parts (3)
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. 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 →- FrameLook closely for dents and hairline cracks around welds, the head tube and bottom-bracket area. Cosmetic scratches matter less than a change in shape or a crack line.Inspect the frame and fork →
- BrakesTest each brake separately and confirm it stops firmly and releases cleanly. Inspect the pads and braking surfaces for wear or contamination, and check the cables or hoses for damage.Inspect the brakes →
- SuspensionAsk when the fork was last serviced. Check the stanchions for damage, look for oil at the seals and make sure the fork moves smoothly without bushing play.Evaluate the suspension →
- DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 9-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 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: 2021 Kona Fire Mountain · Mountain · Published sizes: XS (26"), S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Kona 6061 Aluminum Butted · Fork: Suntour XCR 32 LO-R Coil Spring 100mm
Suspension
Evaluate the suspension →Archived: Fork: Suntour XCR 32 LO-R Coil Spring 100mm
Drivetrain
Check drivetrain wear →Archived: Shifters: Microshift Advent · Rear derailleur: Microshift Advent w/ Clutch · Crankset: Samox; Chainring: 28t · Bottom bracket: FSA 7420 73mm · Cassette: Microshift Advent 11-46t 9spd · Chain: KMC X9
Brakes
Inspect the brakes →Archived: Brakes: Brake Calipers: Tektro HDM275; Front Brake Rotor: Tektro TR180 180mm; Rear Brake Rotor: Tektro TR160 160mm; Brake Levers: Tektro HDM275
Wheels and tires
Check wheels and tires →Archived: Wheel size: 26" · Rims: Alex DP27K · Hubs: (F) Joytech 100x9mm / (R) Joytech 135x10mm · Front tire: WTB Trail Boss 27.5/26x2.25" · Rear tire: WTB Trail Boss 27.5/26x2.25"
Controls and contact points
Archived: Headset: FSA No.57B · Handlebar: Kona Aluminum Riser · Stem: Kona Control · Seatpost: Kona Thumb w/Offset 31.6mm · Saddle: Kona XC · Pedals: Kona JS2
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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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.




