Kona Big Kahuna

2012 MountainCross-country

Wheels: 29″
Drivetrain: 2 × 10 26–39t / 11–36t
Gear range: 491%
Frame: Aluminum
Brakes: Mechanical disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

22 of 24 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

Kona Scandium 69 Butted Aluminum Not identified

Suspension

2 parts

Fork
- RockShox Reba RL
Rear shock

None

Drivetrain

7 parts

Bottom bracket
- SRAM
Cassette
- SRAM PG-1030 10 speeds
PG-1030
Chain
- SRAM PC-1031 10 speeds
PC-1031
Crankset

39/26 Not identified
Front derailleur
- SRAM X7
Rear derailleur
- SRAM X9
Shifters
- SRAM X7

Brakes

3 parts

Wheels and tires

5 parts

Cockpit and contact points

7 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 19"

Table

Reach 415mm

Stack 640mm

Wheelbase 1115mm

Head angle 70.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	395	415	415	420	440
Stackmm	615	630	640	655	675
Top tube lengthmm	570	595	610	620	650
Seat tube lengthmm	405	455	485	510	560
Head tube lengthmm	110	120	130	140	160
Head tube angle	68.5°	70°	70°	71°	72°
Seat tube angle	74°	74°	73°	73°	73°
Chainstay lengthmm	440	440	440	440	440
Wheelbasemm	1100	1115	1115	1115	1130
Front centermm	665	675	680	680	695
Bottom bracket dropmm	69	64	64	64	64
Bottom bracket heightmm	305	310	310	310	310
Standover heightmm	780	815	830	850	885
Fork rakemm	50	50	50	50	50
Trailmm	92	78	81	73	66
Stack/reach ratio	1.56	1.52	1.54	1.56	1.53

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Hardtail

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 26
Largest chainring: 39
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 20.9 in
Highest gear: 102.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire width: 2.2″
Travel: Front: Additional specification: Not available: No
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

2 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

20.9 gear inches

This value is above the central range for this class.

Cohort: Mountain / Cross-country Model year: 2012
Sample: 294 bicycles with this information
Coverage: 93.0% of the class

Highest gear

102.8 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2012
Sample: 294 bicycles with this information
Coverage: 93.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.0 km/h
Highest gear: 39.4 km/h

Total gear range 491%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 20.9–102.8 gear inches
Class reference (p10–p90): 16.8–116.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Cross-country Model year: 2012
Lowest gear: 294 bicycles with this information, 93.0% of the class
Highest gear: 294 bicycles with this information, 93.0% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Changes since 2011

Changes since 2011
Specification	2011 Kona BIG Kahuna	This bicycle Kona Big Kahuna
Suspension
Front travel	100 mm	Not informed
Drivetrain
Front chainrings	3	2
Smallest chainring	22	26
Largest chainring	44	39
Smallest sprocket	12	11
Lowest gear	17.7 in	20.9 in
Highest gear	106.3 in	102.8 in
Other specifications
Tire width	2.1″	2.2″