Principia Evoke A3.9

Name: Principia Evoke A3.9
Brand: Principia

2025 MountainTrail Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €879 Last known price
Wheels: 29″
Drivetrain: 1 × 9 32t / 11–36t
Gear range: 327%
Weight: 15 kg 33.1 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

6 of 8 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

Aluminium Not identified

Suspension

1 part

Fork
- SR Suntour XCR32

Drivetrain

3 parts

Cassette
- Shimano CS-HG201 9 speeds 11–36t
CS-HG201
Crankset
- Samox 32t
Rear derailleur
- Shimano RD-M2000
RD-M2000

Brakes

1 part

Brakes
- Tektro
HD-M285

Wheels and tires

2 parts

Rims

29in Not identified
Tires
- Kenda Aptor
K-1153

Sizes and geometry

4 sizes Open in the geometry plotter

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

Size 17"

Table

Reach 393mm

Stack 643mm

Wheelbase 1135mm

Head angle 69.0°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	393	393	393	393
Stackmm	643	643	643	643
Top tube lengthmm	583	583	583	583
Seat tube lengthmm	381	432	483	533
Head tube lengthmm	120	120	120	120
Head tube angle	69°	69°	69°	69°
Seat tube angle	73°	73°	73°	73°
Chainstay lengthmm	475	475	475	475
Wheelbasemm	1135	1135	1135	1135
Front centermm	667	667	667	667
Bottom bracket dropmm	63	63	63	63
Bottom bracket heightmm	304	304	304	304
Standover heightmm	752	782	812	843
Fork rakemm	45	45	45	45
Trailmm	91	91	91	91
Stack/reach ratio	1.64	1.64	1.64	1.64

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
Bicycle weight: 15 kg

33.1 lb

Suspension

Suspension configuration: Hardtail

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 25.8 in
Highest gear: 84.4 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Shifting: Mechanical

Additional specifications

Tire width: 2.1″
Travel: Front: Additional specification: Not available: No
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

3 measures

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

Lowest gear

25.8 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Highest gear

84.4 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Shifting

Mechanical

388 of 1,849 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,849 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 9.9 km/h
Highest gear: 32.3 km/h

Total gear range 327%

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: 25.8–84.4 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2025
Lowest gear: 1384 bicycles with this information, 74.6% of the class
Highest gear: 1384 bicycles with this information, 74.6% 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.

Differences across 2025 builds
Specification	This bicycle Principia Evoke A3.9	Principia Evoke A2.0	Principia Evoke A2.4	Principia Evoke A2.6	Principia Evoke A5.9	Principia Evoke A6.9
Frame
Bicycle weight	15 kg	11.5 kg	13.1 kg	13.5 kg	15.5 kg	15.5 kg
Drivetrain
Smallest chainring	32	36	40	40	32	32
Largest chainring	32	36	40	40	32	32
Rear sprockets	9	Not informed	7	7	10	11
Smallest sprocket	11	14	12	12	11	11
Largest sprocket	36	28	32	32	42	42
Lowest gear	25.8 in	25.7 in	30.0 in	32.5 in	22.1 in	22.1 in
Highest gear	84.4 in	51.4 in	80.0 in	86.7 in	84.4 in	84.4 in
Other specifications
Tire width	2.1″	Not informed	2″	2.1″	2.1″	2.1″
Wheel size	29″	20″	24″	26″	29″	29″
Fork spring	Not informed	Coil	Coil	Coil	Not informed	Air