Principia 40

Name: Principia 40
Brand: Principia

2024 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €1,999 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 12 40t / 10–45t
Gear range: 450%
Weight: 10.8 kg 23.8 lb · Reference configuration not specified
Brakes: Hydraulic disc

Sizes

Size guide

48cm
51cm
54cm
56cm
59cm

The manufacturer did not publish rider heights for these sizes.

Components

6 of 7 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

4 parts

Cassette
- Shimano SLX CS-M7100 12 speeds 10–45t
CS-M7100
Chain
- Shimano Deore CN-M6100
CN-M6100
Crankset
- Shimano GRX FC-RX610 12 speeds 40t
FC-RX610
Rear derailleur
- Shimano GRX RD-RX822 12 speeds
RD-RX822

Brakes

1 part

Brakes
- Shimano
SM-RT64

Wheels and tires

2 parts

Rims

28in (700) Not identified
Tires
- Schwalbe

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 54cm

Table

Reach 389mm

Stack 579mm

Wheelbase 1038mm

Head angle 71.5°

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	373	377.5	389	398.5	407
Stackmm	533.6	556.29	579	598	619
Top tube lengthmm	526	537	555	570	584.5
Seat tube lengthmm	480	510	540	560	590
Head tube lengthmm	115	135	155	175	195
Head tube angle	69.5°	70.5°	71.5°	71.2°	72°
Seat tube angle	74°	74°	74°	74°	74°
Chainstay lengthmm	435	435	435	435	435
Wheelbasemm	1025.3	1028.3	1037.6	1053.5	1063.5
Front centermm	599.3	602.2	611.4	627.2	637.2
Bottom bracket dropmm	67	67	67	67	67
Bottom bracket heightmm	282	282	282	282	282
Fork rakemm	45	45	45	45	45
Trailmm	82	76	69	74	66
Stack/reach ratio	1.43	1.47	1.49	1.50	1.52

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: 10.8 kg

23.8 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 40
Largest chainring: 40
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 45
Lowest gear: 25.8 in
Highest gear: 116.0 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

25.8 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

Highest gear

116.0 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: 9.9 km/h
Highest gear: 44.4 km/h

Total gear range 450%

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: 25.8–116.0 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 40	This bicycle Principia 40
Frame
Frame material	Aluminum	Not informed
Bicycle weight	10.3 kg	10.8 kg
Drivetrain
Rear sprockets	11	12
Smallest sprocket	11	10
Largest sprocket	42	45
Lowest gear	27.6 in	25.8 in
Highest gear	105.5 in	116.0 in
Other specifications
Tire width	38c	45c