Velopedia Bicycle Archive

2021 Kona Blast

Original specifications: 27.5" wheels · geometry for 4 published sizes.

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At a glance

Archive #900001982
Model year
2021
Category
Mountain
Original MSRP
$1,049.00
Sizes
S, M, L, XL
Colors
Gloss Chocolate w/ Yellow, Rust & Flame Fade Decals
Geometry
4 manufacturer sizes
In this record
22 specifications · archived image · original MSRP · geometry
Model history 19 other years

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Identification clues

2021 archived details

Published colors
Gloss Chocolate w/ Yellow, Rust & Flame Fade Decals
Frame
Aluminum

Clues, not proof of model year. Colors vary and components may have been replaced.

Campaign
Original buildAluminum · 27.5"

Manufacturer catalog

Published sizes and colors

4 sizes · 2 colors

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

Published sizes

SMLXL

Published colors

Gloss Chocolate w/ YellowRust & Flame Fade Decals

Frameset

Frame ConstructionKona Race Light 6061 Aluminum Butted
Frame MaterialAluminum
ForkRockShox Judy Silver TK Solo Air 100mm

Drivetrain

ShiftersShimano Deore
Rear DerailleurShimano Deore
CranksetFSA Alpha Drive 1x; Chainring: 28t
Bottom BracketFSA 7420 73mm
CassetteShimano Deore 11-51t 11spd
ChainKMC X11
PedalsKona JS2

Brakes

BrakesBrake Calipers: Shimano MT201 Hydraulic; Front Brake Rotor: Shimano RT10 180mm (centerlock); Rear Brake Rotor: Shimano RT10 160mm (centerlock); Brake Levers: Shimano MT201 Hydraulic

Cockpit & Contact Points

HeadsetFSA No.57B
HandlebarKona XC/BC Riser
StemKona XC
SaddleKona XC
SeatpostKona Thumb 31.6mm

Wheels & Tires

Hubs(F) Formula 100x9mm (centerlock) / (R) Shimano 135x10mm (centerlock)
RimsWTB ST I27 TCS 2.0
SpokesStainless Black 14g
Front TireMaxxis Forekaster 27.5x2.35"
Rear TireMaxxis Forekaster 27.5x2.35"
Wheel Size27.5"

Geometry

4 sizes · 15 measurements

Frame measurements by size.

All geometry measurements4 sizes · 15 measurements
MeasurementSMLXL
Seat tube370 mm420 mm470 mm530 mm
Top tube572 mm600 mm628 mm667 mm
Head tube100 mm115 mm125 mm140 mm
Head-tube angle68°68°68°68°
Seat-tube angle75°75°75°75°
Chainstay / rear center435 mm435 mm435 mm435 mm
Wheelbase1109 mm1139 mm1168 mm1208 mm
Bottom-bracket drop50 mm50 mm50 mm50 mm
Bottom-bracket height305 mm305 mm305 mm305 mm
Reach415 mm440 mm465 mm500 mm
Stack585 mm599 mm608 mm622 mm
Standover height710 mm719 mm725 mm748 mm
Fork offset / rake42 mm42 mm42 mm42 mm
Front center678 mm709 mm737 mm778 mm
Fork length / axle-to-crown490 mm490 mm490 mm490 mm

Dimensions as recorded.

Gearing

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

RPM

RPM = pedal turns per minute.

All published sizes28T · 11–51T · 11-speed
Lowest0.55:1 Highest2.55:1 Total range464%
Estimated speed At 90 RPM Lowest gear4.1 mph Highest gear18.9 mph

Rear tire: 27.5×2.35.

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
Cassette · Original
Shimano Deore 11-51t 11spd
Retailer offers
Seatpost · Original
Kona Thumb 31.6mm
Retailer offers
Chain · Original
KMC X11
More parts (6)Fewer parts
Front tire · Original
Maxxis Forekaster 27.5x2.35"
Crankset · Original
FSA Alpha Drive 1x

Chainring: 28t

Rear derailleur · Original
Shimano Deore
Shifters · Original
Shimano Deore
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 Forekaster 27.5x2.35"Check: Verify the fitted tire’s size marking and rim type.
Rear tire
Maxxis Forekaster 27.5x2.35"Check: Verify the rear size; it may differ from the front.
Drivetrain
11-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
FSA 7420 73mmCheck: 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: 2021 Kona Blast · Mountain · Published sizes: S, M, L, XL

Archived: Frame: Kona Race Light 6061 Aluminum Butted · Fork: RockShox Judy Silver TK Solo Air 100mm

Archived: Fork: RockShox Judy Silver TK Solo Air 100mm

Archived: Shifters: Shimano Deore · Rear derailleur: Shimano Deore · Crankset: FSA Alpha Drive 1x; Chainring: 28t · Bottom bracket: FSA 7420 73mm · Cassette: Shimano Deore 11-51t 11spd · Chain: KMC X11

Archived: Brakes: Brake Calipers: Shimano MT201 Hydraulic; Front Brake Rotor: Shimano RT10 180mm (centerlock); Rear Brake Rotor: Shimano RT10 160mm (centerlock); Brake Levers: Shimano MT201 Hydraulic

Archived: Wheel size: 27.5" · Rims: WTB ST i27 TCS 2.0 · Hubs: (F) Formula 100x9mm (centerlock) / (R) Shimano 135x10mm (centerlock) · Front tire: Maxxis Forekaster 27.5x2.35" · Rear tire: Maxxis Forekaster 27.5x2.35"

Controls and contact points

Archived: Headset: FSA No.57B · Handlebar: Kona XC/BC Riser · Stem: Kona XC · Seatpost: Kona Thumb 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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