Velopedia Bicycle Archive

2018 Kona Explosif

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

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At a glance

Archive #900003525
Model year
2018
Category
Mountain
Sizes
S, M, L, XL
Colors
Gloss Green & Charcoal w/ Off-White & Charcoal Decals
Geometry
4 manufacturer sizes
In this record
21 specifications · archived image · geometry
Model history 13 other years

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Identification clues

2018 archived details

Published colors
Gloss Green & Charcoal w/ Off-White & Charcoal Decals
Frame
Steel

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

Campaign
Original buildSteel · 27.5"

Manufacturer catalog

Published sizes and colors

4 sizes · 1 color

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

Published sizes

SMLXL

Published colors

Gloss Green & Charcoal w/ Off-White & Charcoal Decals

Frameset

Frame ConstructionReynolds 520 Butted Cromoly
Frame MaterialSteel
ForkRockShox Revelation RC Solo Air 120mm Tapered 110mm Spacing

Drivetrain

ShiftersSRAM GX-Eagle
Rear DerailleurSRAM GX-Eagle
CranksetSRAM Descendant 6K; Chainring: 34t X-Sync Eagle
Bottom BracketSRAM 73mm
CassetteSRAM GX-Eagle 10-50t 12spd
ChainSRAM GX-Eagle

Brakes

BrakesBrake Calipers: SRAM Guide R; Front Brake Rotor: SRAM Centerline 180mm; Rear Brake Rotor: SRAM Centerline 160mm; Brake Levers: SRAM Guide R

Cockpit & Contact Points

HeadsetFSA No.57B
HandlebarKona XC/BC 35
StemKona XC/BC 35
SaddleWTB Volt Comp (Comp 250 size S)
SeatpostRockShox Reverb w/Plunger Lever 31.6mm

Wheels & Tires

Hubs(F) Formula 110x15mm / (R) Formula 148x12mm
RimsWTB STP I29 TCS
SpokesSandvik Stainless Black 15g fr / 14g rr
Front TireMaxxis Minion DHF EXO TR 3C 27.5x2.3"
Rear TireMaxxis Tomahawk EXO TR 3C 27.5x2.3"
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 tube583 mm612 mm640 mm674 mm
Head tube100 mm115 mm125 mm140 mm
Head-tube angle67.5°67.5°67.5°67.5°
Seat-tube angle73°73°73°73°
Chainstay / rear center420 mm420 mm420 mm420 mm
Wheelbase1093 mm1124 mm1153 mm1188 mm
Bottom-bracket drop42 mm42 mm42 mm42 mm
Bottom-bracket height313 mm313 mm313 mm313 mm
Reach402 mm427 mm452 mm482 mm
Stack591 mm605 mm614 mm628 mm
Standover height705 mm740 mm775 mm815 mm
Fork offset / rake42 mm42 mm42 mm42 mm
Front center677 mm707 mm736 mm771 mm
Fork length / axle-to-crown509 mm509 mm509 mm509 mm

Dimensions as recorded.

Gearing

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

RPM

RPM = pedal turns per minute.

All published sizes34T · 10–50T · 12-speed
Lowest0.68:1 Highest3.40:1 Total range500%
Estimated speed At 90 RPM Lowest gear5.0 mph Highest gear25.1 mph

Rear tire: 27.5×2.3.

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
SRAM GX-Eagle
Retailer offers
Cassette · Original
SRAM GX-Eagle 10-50t 12spd
Retailer offers
Rear tire · Original
Maxxis Tomahawk EXO TR 3C 27.5x2.3"
Retailer offers
More parts (8)Fewer parts
Front tire · Original
Maxxis Minion DHF EXO TR 3C 27.5x2.3"
Saddle · Original
WTB Volt Comp (Comp 250 size S)
Crankset · Original
SRAM Descendant 6K

Chainring: 34t X-Sync Eagle

Rear derailleur · Original
SRAM GX-Eagle Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.
Shifters · Original
SRAM GX-Eagle Before ordering: Confirm whether the drivetrain is mechanical or electronic before ordering.
Seatpost · Original
RockShox Reverb w/Plunger Lever 31.6mm
Headset · Original
FSA No.57B
Rims · Original
WTB STP i29 TCS

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 Minion DHF EXO TR 3C 27.5x2.3"Check: Verify the fitted tire’s size marking and rim type.
Rear tire
Maxxis Tomahawk EXO TR 3C 27.5x2.3"Check: Verify the rear size; it may differ from the front.
Drivetrain
12-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
SRAM 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: 2018 Kona Explosif · Mountain · Published sizes: S, M, L, XL

Archived: Frame: Reynolds 520 Butted Cromoly · Fork: RockShox Revelation RC Solo Air 120mm Tapered 110mm Spacing

Archived: Fork: RockShox Revelation RC Solo Air 120mm Tapered 110mm Spacing

Archived: Shifters: SRAM GX-Eagle · Rear derailleur: SRAM GX-Eagle · Crankset: SRAM Descendant 6K; Chainring: 34t X-Sync Eagle · Bottom bracket: SRAM 73mm · Cassette: SRAM GX-Eagle 10-50t 12spd · Chain: SRAM GX-Eagle

Archived: Brakes: Brake Calipers: SRAM Guide R; Front Brake Rotor: SRAM Centerline 180mm; Rear Brake Rotor: SRAM Centerline 160mm; Brake Levers: SRAM Guide R

Archived: Wheel size: 27.5" · Rims: WTB STP i29 TCS · Hubs: (F) Formula 110x15mm / (R) Formula 148x12mm · Front tire: Maxxis Minion DHF EXO TR 3C 27.5x2.3" · Rear tire: Maxxis Tomahawk EXO TR 3C 27.5x2.3"

Controls and contact points

Archived: Headset: FSA No.57B · Handlebar: Kona XC/BC 35 · Stem: Kona XC/BC 35 · Seatpost: RockShox Reverb w/Plunger Lever 31.6mm · Saddle: WTB Volt Comp (Comp 250 size S)

Before and during the test ride

Follow the full used-bike inspection order →

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Campaign

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

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