Principia 40

Name: Principia 40
Brand: Principia

2023 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €1,999 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 11 40t / 11–42t
Gear range: 382%
Weight: 10.3 kg 22.7 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

48cm
51cm
54cm
56cm
58cm
61cm

The manufacturer did not publish rider heights for these sizes.

Components

5 of 9 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

Carbon Not identified

Drivetrain

3 parts

Cassette
- SunRace 11–42t
Crankset
- Shimano GRX FC-RX600 40t
FC-RX600
Rear derailleur
- Shimano GRX

Brakes

1 part

Brakes
- Shimano GRX BL-RX600
BL-RX600

Wheels and tires

2 parts

Rims

Aluminium w. thru-axle (12x125mm front, 12x160,5mm rear) Not identified
Tires
- Panaracer

Cockpit and contact points

1 part

Pedals

Not included Not identified

Sizes and geometry

6 sizes Open in the geometry plotter

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

Size 54cm

Table

Reach 378mm

Stack 555mm

Wheelbase 1044mm

Head angle 70.5°

Seat angle 74.0°

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 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	373.5	373.49	377.96	384	392.74	401.61
Stackmm	531.88	531.88	554.62	577	598.41	617.43
Top tube lengthmm	526	526	537	555	570	584.5
Seat tube lengthmm	460	490	520	540	560	590
Head tube lengthmm	115	115	135	155	175	195
Head tube angle	69.5°	69.5°	70.5°	71.5°	71.5°	72°
Seat tube angle	74°	74°	74°	73.5°	73.5°	73.5°
Chainstay lengthmm	445	445	445	445	445	445
Wheelbasemm	1040.6	1040.6	1043.61	1047.39	1057.91	1072.95
Front centermm	604	604	607	611	622	637
Bottom bracket dropmm	67	67	67	67	67	67
Bottom bracket heightmm	287	287	287	287	287	287
Standover heightmm	725	748	776	796	816	843
Fork rakemm	50	50	50	50	45	50
Trailmm	79	79	72	66	62	63
Stack/reach ratio	1.42	1.42	1.47	1.50	1.52	1.54

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: Carbon
Bicycle weight: 10.3 kg

22.7 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 40
Largest chainring: 40
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 42
Lowest gear: 27.6 in
Highest gear: 105.5 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic 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

27.6 gear inches

This value is within 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

105.5 gear inches

This value is within 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: 10.6 km/h
Highest gear: 40.4 km/h

Total gear range 382%

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: 27.6–105.5 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