Rear tire: 26×2.25.
Velopedia Bicycle Archive
2021 Kona Fire Mountain
Original specifications: 26" wheels · geometry for 5 published sizes.
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At a glance
Archive #900001981- 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
- In this record
- 22 specifications · 2 archived images · original MSRP · geometry
Model history 26 other years
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Identification clues
2021 archived details
- Published colors
- Matt Blood Orange or Matt Faux Raw w/ Gloss Metallic Blue & Black Decals
- Frame
- Aluminum
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildAluminum · 26"
Frameset
| Frame Construction | Kona 6061 Aluminum Butted |
|---|---|
| Frame Material | Aluminum |
| Fork | Suntour XCR 32 LO-R Coil Spring 100mm |
Drivetrain
| 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 |
| 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" |
No specifications match. Try a component name or clear your search.
Geometry
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
All geometry measurements5 sizes · 15 measurements
| 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 |
Dimensions as recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM = pedal turns per minute.
Rear tire: 27.5×2.25.
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 your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
Find replacement parts
More parts (5)Fewer parts
Chainring: 28t
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
- WTB Trail Boss 27.5/26x2.25"Check: Verify the fitted tire’s size marking and rim type.
- Rear tire
- WTB Trail Boss 27.5/26x2.25"Check: Verify the rear size; it may differ from the front.
- Drivetrain
- 9-speedCheck: Match the installed drivetrain family, not just its speed count.
- Bottom bracket / shell
- FSA 7420 73mmCheck: Verify shell type and width, crank interface, and spindle length or spacers.
Not confirmed in this record: Seatpost diameter. Check the fitted parts for these details.
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
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Gallery2 images
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.





