Principia 20

Name: Principia 20
Brand: Principia

2024 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €1,399 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 10 42t / 11–39t
Gear range: 355%
Weight: 12.1 kg 26.7 lb · Reference configuration not specified
Brakes: Hydraulic disc

Sizes

Size guide

45cm
50cm
55cm
61cm

The manufacturer did not publish rider heights for these sizes.

Components

5 of 6 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.

Drivetrain

3 parts

Cassette
- Shimano CS-LG300 11–39t
CS-LG300
Crankset
- Shimano Cues FC-U4000 11 speeds 42t
FC-U4000
Rear derailleur
- Shimano Cues RD-U4010 10 speeds
RD-U4010

Brakes

1 part

Brakes
- Shimano
SM-RT54

Wheels and tires

2 parts

Rims

28in (700) Not identified
Tires
- Schwalbe

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 50cm

Table

Reach 399mm

Stack 599mm

Wheelbase 1061mm

Head angle 71.0°

Seat angle 74.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c 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	397.3	399	397.4	410.9
Stackmm	575.8	598.8	624.5	663.9
Top tube lengthmm	557	565	570	595
Seat tube lengthmm	450	500	550	610
Head tube lengthmm	135	155	180	215
Head tube angle	70°	71°	71.5°	73°
Seat tube angle	74.5°	74.5°	74.5°	74.5°
Chainstay lengthmm	435	435	435	435
Wheelbasemm	1060.5	1060.5	1061.6	1071.2
Front centermm	633.7	633.7	634.8	644.3
Bottom bracket dropmm	67	67	67	67
Bottom bracket heightmm	282	282	282	282
Fork rakemm	45	45	45	45
Trailmm	79	72	69	59
Stack/reach ratio	1.45	1.50	1.57	1.62

Not published by the manufacturer: Standover height, 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
Fork material: Carbon
Bicycle weight: 12.1 kg

26.7 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 42
Largest chainring: 42
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 39
Lowest gear: 31.2 in
Highest gear: 110.7 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Shifting: Mechanical

Additional specifications

Tire width: 45c
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

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

Lowest gear

31.2 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2024
Sample: 1,719 bicycles with this information
Coverage: 76.6% of the class

Highest gear

110.7 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2024
Sample: 1,719 bicycles with this information
Coverage: 76.6% of the class

Shifting

Mechanical

772 of 2,241 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2024
Sample: 2,241 bicycles with this information
Coverage: 99.9% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 12.0 km/h
Highest gear: 42.4 km/h

Total gear range 355%

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: 31.2–110.7 gear inches
Class reference (p10–p90): 23.2–131.8 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2024
Lowest gear: 1719 bicycles with this information, 76.6% of the class
Highest gear: 1719 bicycles with this information, 76.6% 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.

Changes since 2023

Changes since 2023
Specification	2023 Principia 20	This bicycle Principia 20
Frame
Frame material	Aluminum	Not informed
Fork material	Aluminum	Carbon
Drivetrain
Front chainrings	2	1
Smallest chainring	34	42
Largest chainring	50	42
Largest sprocket	34	39
Lowest gear	29.0 in	31.2 in
Highest gear	131.8 in	110.7 in
Brakes
Brake type	Mechanical disc	Hydraulic disc
Other specifications
Tire width	38c	45c