BESV TRX-B 1.2

2025 MountainTrail Electric bicycle Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €3,699 Last known price
Fork travel: 120 mm
Wheels: 29″
Drivetrain: 1 × 11 34t / 11–50t
Gear range: 455%
Battery: 625 Wh
Weight: 25.3 kg 55.8 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 163–176
MD 174–188
LG 185–197

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

BESV TRX-B Series alloy frame, Bosch eBike system compatible Not identified

Electric system

3 parts

Suspension

1 part

Fork
- RockShox Judy Silver TK

Drivetrain

6 parts

Bottom bracket
- Bosch
Cassette
- Shimano CS-LG400-11 11 speeds 11–50t
CS-LG400-11CS-LG400
Chain
- Shimano CN-LG500
CN-LG500
Crankset
- Samox 34t
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues SL-U6000
SL-U6000

Brakes

1 part

Brakes
- Shimano

Wheels and tires

2 parts

Rims
- Shimano
Tires

29 x 2.6 Not identified

Cockpit and contact points

7 parts

Grips
- BESV
Handlebar

E-MTB rizer bar Not identified
Headset
- Acros
Pedals
- Wellgo
Saddle
- Selle Italia S5 SUPERFLOW
Seatpost
- ProMax
SP-726
Stem

E-MTB alloy stem Not identified

Other components

2 parts

Lights
- Lezyne
Lock
- Abus

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 435mm

Stack 652mm

Wheelbase 1168mm

Head angle 68.0°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ 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	425	435	460
Stackmm	647	652	657
Top tube lengthmm	611	623	648
Seat tube lengthmm	425	460	500
Head tube lengthmm	120	125	130
Head tube angle	68°	68°	68°
Seat tube angle	74°	74°	74°
Chainstay lengthmm	450	450	450
Wheelbasemm	1156	1168	1195
Front centermm	712	723	750
Bottom bracket dropmm	55	55	55
Bottom bracket heightmm	319	319	319
Standover heightmm	788	801	810
Fork rakemm	42	42	42
Trailmm	106	106	106
Stack/reach ratio	1.52	1.50	1.43

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: 25.3 kg

55.8 lb

Suspension

Suspension configuration: Hardtail
Front travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 34
Largest chainring: 34
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 19.7 in
Highest gear: 89.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Electric system

Battery capacity: 625 Wh

Additional specifications

Battery: 625WH
Bottom bracket standard: Bosch
Fork spring: Air
Tire width: 2.6″
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

4 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,810 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

19.7 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Highest gear

89.6 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Shifting

Mechanical

388 of 1,849 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,849 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.6 km/h
Highest gear: 34.3 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: 19.7–89.6 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2025
Lowest gear: 1384 bicycles with this information, 74.6% of the class
Highest gear: 1384 bicycles with this information, 74.6% 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 2025 builds
Specification	This bicycle BESV TRX-B 1.2	BESV TRX-B 1.0	BESV TRX-B 1.0 LS	BESV TRX-B 1.1	BESV TRX-B 1.1 ST	BESV TRX-B 1.2 LS
Frame
Bicycle weight	25.3 kg	26.4 kg	26.4 kg	Not informed	Not informed	25.1 kg
Drivetrain
Rear sprockets	11	12	12	12	12	11
Smallest sprocket	11	10	10	10	10	11
Largest sprocket	50	51	51	51	51	50
Lowest gear	19.7 in	19.3 in	19.3 in	19.3 in	19.3 in	19.7 in
Highest gear	89.6 in	98.6 in	98.6 in	98.6 in	98.6 in	89.6 in
Electric bicycle systems
Battery capacity	625 Wh	750 Wh	750 Wh	750 Wh	750 Wh	625 Wh