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.

Campaign
Original buildAluminum · 26"

Manufacturer catalog

Published sizes and colors

5 sizes · 1 color

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

Published sizes

XS (26")SMLXL

Published colors

Matt Blood Orange or Matt Faux Raw w/ Gloss Metallic Blue & Black Decals

Frameset

Frame ConstructionKona 6061 Aluminum Butted
Frame MaterialAluminum
ForkSuntour XCR 32 LO-R Coil Spring 100mm

Drivetrain

ShiftersMicroshift Advent
Rear DerailleurMicroshift Advent w/ Clutch
CranksetSamox; Chainring: 28t
Bottom BracketFSA 7420 73mm
CassetteMicroshift Advent 11-46t 9spd
ChainKMC X9
PedalsKona JS2

Brakes

BrakesBrake Calipers: Tektro HDM275; Front Brake Rotor: Tektro TR180 180mm; Rear Brake Rotor: Tektro TR160 160mm; Brake Levers: Tektro HDM275

Cockpit & Contact Points

HeadsetFSA No.57B
HandlebarKona Aluminum Riser
StemKona Control
SaddleKona XC
SeatpostKona Thumb w/Offset 31.6mm

Wheels & Tires

Hubs(F) Joytech 100x9mm / (R) Joytech 135x10mm
RimsAlex DP27K
SpokesStainless Black 14g
Front TireWTB Trail Boss 27.5/26x2.25"
Rear TireWTB Trail Boss 27.5/26x2.25"
Wheel Size26"

Geometry

5 sizes · 15 measurements

Frame measurements by size.

All geometry measurements5 sizes · 15 measurements
MeasurementXSSMLXL
Seat tube331 mm370 mm420 mm470 mm530 mm
Top tube549 mm572 mm600 mm628 mm667 mm
Head tube100 mm100 mm115 mm125 mm140 mm
Head-tube angle67.5°68°68°68°68°
Seat-tube angle75°75°75°75°75°
Chainstay / rear center425 mm435 mm435 mm435 mm435 mm
Wheelbase1085 mm1109 mm1139 mm1168 mm1208 mm
Bottom-bracket drop30 mm50 mm50 mm50 mm50 mm
Bottom-bracket height303 mm304 mm304 mm304 mm304 mm
Reach400 mm415 mm440 mm465 mm500 mm
Stack556 mm585 mm599 mm608 mm622 mm
Standover height675 mm710 mm718 mm724 mm747 mm
Fork offset / rake40 mm42 mm42 mm42 mm42 mm
Front center662 mm678 mm709 mm737 mm778 mm
Fork length / axle-to-crown483 mm490 mm490 mm490 mm490 mm

Dimensions as recorded.

Gearing

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

RPM

RPM = pedal turns per minute.

XS28T · 11–46T · 9-speed
Lowest0.61:1 Highest2.55:1 Total range418%
Estimated speed At 90 RPM Lowest gear4.3 mph Highest gear18.1 mph

Rear tire: 26×2.25.

S, M, L, XL28T · 11–46T · 9-speed
Lowest0.61:1 Highest2.55:1 Total range418%
Estimated speed At 90 RPM Lowest gear4.5 mph Highest gear18.7 mph

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 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
Chain · Original
KMC X9
Cassette · Original
Microshift Advent 11-46t 9spd
Front tire · Original
WTB Trail Boss 27.5/26x2.25"
More parts (5)Fewer parts
Crankset · Original
Samox

Chainring: 28t

Rear derailleur · Original
Microshift Advent w/ Clutch
Shifters · Original
Microshift Advent
Headset · Original
FSA No.57B
Rims · Original
Alex DP27K

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.

Campaign
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: 2021 Kona Fire Mountain · Mountain · Published sizes: XS (26"), S, M, L, XL

Archived: Frame: Kona 6061 Aluminum Butted · Fork: Suntour XCR 32 LO-R Coil Spring 100mm

Archived: Fork: Suntour XCR 32 LO-R Coil Spring 100mm

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

Archived: Brakes: Brake Calipers: Tektro HDM275; Front Brake Rotor: Tektro TR180 180mm; Rear Brake Rotor: Tektro TR160 160mm; Brake Levers: Tektro HDM275

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 →

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

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