BH iRS1 1.2

Name: BH iRS1 1.2
Brand: BH

2026 RoadEndurance Electric bicycle Manufacturer page

BH iRS1 1.2, color Grisoscuro Grisclaro Negro

Price: Not published

Prices shown first for United States
United Kingdom: £3,899 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 34–50t / 11–34t
Gear range: 455%
Battery: 630 Wh
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–170
MD 168–179
LG 176–187

Components

18 of 23 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

Race Alloy 28" internal cable routing Not identified

Electric system

3 parts

Battery

630Wh Not identified
Display
- BH
Motor

NR System Not identified

Suspension

1 part

Fork
- BH

Drivetrain

6 parts

Cassette
- Shimano 105 CS-R7101-12 12 speeds 11–34t
CS-R7101-12
Chain
- Shimano SLX CN-M7100
CN-M7100
Crankset
- FSA 50/34t
Front derailleur
- Shimano 105
Rear derailleur
- Shimano 105
Shifters
- Shimano 105

Brakes

1 part

Brakes
- Shimano 105

Wheels and tires

5 parts

Cockpit and contact points

7 parts

Grips

Bar Tape Not identified
Handlebar
- FSA Energy
Headset
- FSA
Pedals

None
Saddle
- Prologo
Seatpost
- BH
Stem
- FSA NS ACR

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 396mm

Stack 560mm

Wheelbase 1012mm

Head angle 72.0°

Seat angle 72.5°

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 Reported by the manufacturer

Complete manufacturer geometry table 3 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	393	396	406
Stackmm	544	560	587
Top tube lengthmm	549	567	587
Seat tube lengthmm	470	490	510
Head tube lengthmm	145	160	175
Head tube angle	71.5°	72°	73°
Seat tube angle	73.5°	72.5°	72.5°
Chainstay lengthmm	420	420	420
Wheelbasemm	1009	1012	1022
Front centermm	599	602	612
Bottom bracket dropmm	70	70	70
Bottom bracket heightmm	275	275	275
Fork rakemm	41	41	42
Trailmm	70	67	60
Stack/reach ratio	1.38	1.41	1.45

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
Frame material: Aluminum
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 50
Rear sprockets: 12
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: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Electric system

Battery capacity: 630 Wh

Additional specifications

Battery: 630Wh
Tire width: 28c
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 within the central range for this class.

Cohort: Road / Endurance Model year: 2026
Sample: 479 bicycles with this information
Coverage: 79.3% of the class

Highest gear

131.8 gear inches

This value is within the central range for this class.

Cohort: Road / Endurance Model year: 2026
Sample: 479 bicycles with this information
Coverage: 79.3% of the class

Shifting

Mechanical

327 of 604 bicycles with this information use electronic shifting.

Cohort: Road / Endurance Model year: 2026
Sample: 604 bicycles with this information
Coverage: 100.0% 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): 26.6–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Endurance Model year: 2026
Lowest gear: 479 bicycles with this information, 79.3% of the class
Highest gear: 479 bicycles with this information, 79.3% of the class