BH RS1 4.2

Name: BH RS1 4.2
Brand: BH

2026 RoadRace Manufacturer page

Price: Not published

Prices shown first for United States
United Kingdom: £3,599 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 35–48t / 10–36t
Gear range: 494%
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 156–166
SM 163–174
MD 171–182
LG 179–189
XL 185–195

Components

11 of 16 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

RS1, PCL Carbon Layup, Monocoque, Disc, ACR Not identified

Suspension

1 part

Fork

RS1, Integrated Tapered, Full Carbon 1.5" Not identified

Drivetrain

6 parts

Brakes

1 part

Brakes
- SRAM Rival

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Handlebar

EVO SL Monocoque ACR Not identified
Headset
- FSA
Saddle
- Prologo
Seatpost

RS1 Aero Not identified
Stem

EVO SL Monocoque ACR Not identified

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 380mm

Stack 557mm

Wheelbase 984mm

Head angle 72.5°

Seat angle 73.5°

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	370	375	380	388	393
Stackmm	526	544	557	583	597
Top tube lengthmm	516	531	545	560	576
Seat tube lengthmm	460	480	500	520	540
Head tube lengthmm	120	135	150	160	190
Head tube angle	71°	72°	72.5°	73°	73°
Seat tube angle	74.5°	74°	73.5°	73.5°	73°
Chainstay lengthmm	412	412	415	415	418
Wheelbasemm	965	980	984	1009	1012
Front centermm	569	580	583	596	606
Bottom bracket dropmm	71	71	70	70	70
Bottom bracket heightmm	265	265	266	266	266
Fork rakemm	31	43	39	53	44
Trailmm	83	64	65	47	57
Stack/reach ratio	1.42	1.45	1.47	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
Frame material: Carbon
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 35
Largest chainring: 48
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 36
Lowest gear: 28.2 in
Highest gear: 139.2 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

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

28.2 gear inches

This value is below the central range for this class.

Cohort: Road / Race Model year: 2026
Sample: 720 bicycles with this information
Coverage: 78.6% of the class

Highest gear

139.2 gear inches

This value is above the central range for this class.

Cohort: Road / Race Model year: 2026
Sample: 720 bicycles with this information
Coverage: 78.6% of the class

Shifting

Electronic

632 of 913 bicycles with this information use electronic shifting.

Cohort: Road / Race Model year: 2026
Sample: 913 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.8 km/h
Highest gear: 53.3 km/h

Total gear range 494%

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: 28.2–139.2 gear inches
Class reference (p10–p90): 27.4–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Race Model year: 2026
Lowest gear: 720 bicycles with this information, 78.6% of the class
Highest gear: 720 bicycles with this information, 78.6% 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.

Differences across 2026 builds

Differences across 2026 builds
Specification	This bicycle BH RS1 4.2	BH RS1 3.5	BH RS1 4.0	BH RS1 4.5	BH RS1 5.0	BH RS1 5.5
Drivetrain
Smallest chainring	35	36	36	36	36	36
Largest chainring	48	52	52	52	52	52
Smallest sprocket	10	11	11	11	11	11
Largest sprocket	36	34	34	34	34	34
Lowest gear	28.2 in	30.7 in	30.7 in	30.7 in	30.7 in	30.7 in
Highest gear	139.2 in	137.1 in	137.1 in	137.1 in	137.1 in	137.1 in
Cockpit
Shifting	Electronic	Mechanical	Electronic	Electronic	Electronic	Electronic
Other specifications
Wheel material	Aluminum	Aluminum	Aluminum	Carbon	Aluminum	Carbon