Velopedia Bicycle Archive

Compare Bicycles

Compare published geometry, gearing and specifications for up to three bicycles.

1 of 2 bicycles

At a glance

Key differences

Supported differences are shown below. Data limitations are labeled separately.

  1. Gearing

    2021 Kona Blast has a 18% lower climbing ratio than 2020 Kona Blast.

    A lower ratio gives more mechanical advantage; rear-wheel rollout determines distance per crank turn.

Selected-size geometry

Geometry overlay

Frames share one scale and a bottom-bracket alignment. Size labels differ by brand; schematic drawing aids are identified below.

Gearing comparison

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

RPM

RPM = pedal turns per minute.

2021 Kona BlastSize M · 28T · 11–51T · 11-speed
Lowest0.55:1Highest2.55:1Total range464%
Estimated speed at 90 RPMLowest gear4.1 mphHighest gear18.9 mph

Rear tire: 27.5×2.35.

2020 Kona BlastSize M · 28T · 11–42T · 10-speed
Lowest0.67:1Highest2.55:1Total range382%
Estimated speed at 90 RPMLowest gear4.9 mphHighest 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

Complete specification tableShows different published values and gaps where a bicycle lacks data. Different wording reflects source language, not necessarily different components. Swipe for more columns.
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Specification
2021 Kona Blast
2020 Kona Blast
Overview
Model Year
2021
2020
Brand
Kona
Kona
Model
Blast
Blast
Bicycle Type
Mountain
Mountain
Original MSRP
$1,049.00
Not documented
Colors
Gloss Chocolate w/ Yellow, Rust & Flame Fade Decals
Gloss Dirty Cyan or Black w/ Dark Cyan & Faux Yellow Decals
Sizes
S, M, L, XL
S, M, L, XL
Weight
—
—
Frameset
Frame Construction
Kona Race Light 6061 Aluminum Butted
Kona Race Light 6061 Aluminum Butted
Frame Material
Aluminum
Aluminum
Fork
RockShox Judy Silver TK Solo Air 100mm
RockShox 30 Silver TK Solo Air 100mm
Drivetrain
Shifters
Shimano Deore
Shimano Deore
Rear Derailleur
Shimano Deore
Shimano Deore
Crankset
FSA Alpha Drive 1x; Chainring: 28t
FSA Alpha Drive 1x; Chainring: 28t
Bottom Bracket
FSA 7420 73mm
FSA 7420
Cassette
Shimano Deore 11-51t 11spd
Shimano Deore 11-42t 10spd
Chain
KMC X11
KMC X10
Pedals
Kona JS2
Kona JS2
Brakes
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
Brake Calipers: Shimano MT401 Hydraulic; Front Brake Rotor: Shimano RT10 180mm (centerlock); Rear Brake Rotor: Shimano RT10 160mm (centerlock); Brake Levers: Shimano MT401 Hydraulic
Cockpit & Contact Points
Headset
FSA No.57B
FSA No.57B
Handlebar
Kona XC/BC Riser
Kona XC/BC Riser
Stem
Kona XC
Kona XC
Saddle
Kona XC
Kona XC
Seatpost
Kona Thumb 31.6mm
Kona Thumb 31.6mm
Wheels & Tires
Hubs
(F) Formula 100x9mm (centerlock) / (R) Shimano 135x10mm (centerlock)
(F) Formula 100x9mm (centerlock) / (R) Shimano 135x10mm (centerlock)
Rims
WTB ST I27 TCS 2.0
WTB ST I27 TCS 2.0
Spokes
Stainless Black 14g
Stainless Black 14g
Front Tire
Maxxis Forekaster 27.5x2.35"
WTB Trail Boss 27.5x2.25"
Rear Tire
Maxxis Forekaster 27.5x2.35"
WTB Trail Boss 27.5x2.25"
Wheel Size
27.5"
27.5"
Geometry · choose a size for each bicycle
Geometry size
Reach
440 mm
440 mm
Stack
599 mm
599 mm
Head-tube angle
68°
68°
Seat-tube angle
75°
75°
Seat tube
420 mm
420 mm
Head tube
115 mm
115 mm
Chainstay / rear center
435 mm
435 mm
Wheelbase
1139 mm
1139 mm
Bottom-bracket drop
50 mm
50 mm
Bottom-bracket height
305 mm
304 mm
Standover height
719 mm
718 mm
Fork offset / rake
42 mm
42 mm
Front center
709 mm
709 mm

Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.

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