Principia 20

Name: Principia 20
Brand: Principia

2023 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €1,299 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 10 34–50t / 11–34t
Gear range: 455%
Weight: 12.1 kg 26.7 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Mechanical disc

Sizes

Size guide

45cm
50cm
55cm
61cm

The manufacturer did not publish rider heights for these sizes.

Components

5 of 10 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

Aluminium Not identified

Drivetrain

4 parts

Cassette
- SunRace 11–34t
Crankset

Aluminium 50/34T Not identified
Front derailleur
- Shimano Tiagra FD-4700 2 speeds
FD-4700
Rear derailleur
- Shimano Tiagra RD-4700 10 speeds
RD-4700

Brakes

1 part

Brakes
- Tektro MD-C400
MD-C400

Wheels and tires

2 parts

Rims

28in (700) Not identified
Tires
- Panaracer

Cockpit and contact points

1 part

Pedals

Not included Not identified

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 402mm

Stack 589mm

Wheelbase 1065mm

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	400.13	401.76	406.2	413.68
Stackmm	565.67	588.61	590.63	653.81
Top tube lengthmm	557	565	570	595
Seat tube lengthmm	450	500	550	610
Head tube lengthmm	135	155	155	155
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	1065.68	1065.05	1064.92	1076.1
Front centermm	639	638	638	649
Bottom bracket dropmm	65	65	65	65
Bottom bracket heightmm	284	284	284	284
Standover heightmm	717.3	762.35	800.66	861.52
Fork rakemm	50	50	50	50
Trailmm	73.82	67.29	64.05	54.42
Stack/reach ratio	1.41	1.47	1.45	1.58

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
Fork material: Aluminum
Bicycle weight: 12.1 kg

26.7 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 50
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 29.0 in
Highest gear: 131.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Shifting: Mechanical

Additional specifications

Tire width: 38c
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

29.0 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2023
Sample: 1,655 bicycles with this information
Coverage: 79.1% of the class

Highest gear

131.8 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2023
Sample: 1,655 bicycles with this information
Coverage: 79.1% of the class

Shifting

Mechanical

688 of 2,087 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2023
Sample: 2,087 bicycles with this information
Coverage: 99.8% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.1 km/h
Highest gear: 50.5 km/h

Total gear range 455%

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: 29.0–131.8 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: 2023
Lowest gear: 1655 bicycles with this information, 79.1% of the class
Highest gear: 1655 bicycles with this information, 79.1% of the class