GASGAS TRA 4

Name: GASGAS TRA 4
Brand: GASGAS

2026 MountainTrail Electric bicycle Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €2,999 Last known price
Fork travel: 120 mm
Wheels: 27.5″
Drivetrain: 1 × 9 38t / 11–46t
Gear range: 418%
Battery: 630 Wh
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
SM 158–171
MD 168–180
MD 168–180
MD 168–180
MD 168–180
LG 178–189
LG 178–189
LG 178–189
LG 178–189
XL 186–199
XL 186–199

Components

19 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

27.5", Alloy 6061, Integrated battery Not identified

Electric system

4 parts

Battery

Simplo, 630 Wh, 36 V Not identified
Charger

Simplo rapid charger, 4 A Not identified
Display
- Yamaha
Motor
- Yamaha

Suspension

1 part

Fork
- RockShox Recon Silver TK

Drivetrain

6 parts

Cassette
- Tektro ED9 11–46t
CS-M350
Chain
- KMC
Chain guide

Direct Mount Not identified
Crankset
- GasGas 38t
Rear derailleur
- Tektro ED8 / ED9
RD-M350
Shifters
- Tektro
SL-M350R

Brakes

2 parts

Brakes
- Formula
Disc rotors
- Formula

Wheels and tires

2 parts

Cockpit and contact points

7 parts

Sizes and geometry

12 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 450mm

Stack 634mm

Wheelbase 1199mm

Head angle 68.0°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 12 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	440	440	440	440	450	450	450	450	460	460	460	460
Stackmm	634	634	646	646	634	634	656	656	653	653	665	665
Top tube lengthmm	622	622	625.5	625.5	632	632	638	638	647	647	650.5	650.5
Seat tube lengthmm	400	400	450	450	450	450	500	500	500	500	550	550
Head tube lengthmm	120	120	120	120	120	120	130	130	140	140	140	140
Head tube angle	68°	68°	67°	67°	68°	68°	67°	67°	68°	68°	67°	67°
Seat tube angle	74°	74°	74°	74°	74°	74°	74°	74°	74°	74°	74°	74°
Chainstay lengthmm	465	465	475	475	465	465	475	475	465	465	475	475
Wheelbasemm	1189	1189	1206	1206	1199	1199	1220	1220	1216	1216	1233.5	1233.5
Front centermm	727	727	737	737	737	737	751	751	754	754	765	765
Bottom bracket dropmm	40	40	60	60	40	40	60	60	40	40	60	60
Bottom bracket heightmm	315	315	295	295	315	315	295	295	315	315	295	295
Fork rakemm	42	42	42	42	42	42	42	42	42	42	42	42
Trailmm	98	98	105	105	98	98	105	105	98	98	105	105
Stack/reach ratio	1.44	1.44	1.47	1.47	1.41	1.41	1.46	1.46	1.42	1.42	1.45	1.45
Suspension and parts
Crank lengthmm	170	170	170	170	170	170	170	170	170	170	170	170
Stem lengthmm	60	60	60	60	70	70	70	70	70	70	70	70

Not published by the manufacturer: Standover height, Front travel, Rear travel, Handlebar width, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Hardtail
Front travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 22.7 in
Highest gear: 95.0 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: Simplo, 630 Wh, 36 V
Fork spring: Coil
Tire width: 2.3″
Wheel material: Aluminum
Wheel size: 27.5″

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: 2026
Sample: 1,644 bicycles with this information
Coverage: 96.3% of the class

Lowest gear

22.7 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,229 bicycles with this information
Coverage: 72.0% of the class

Highest gear

95.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,229 bicycles with this information
Coverage: 72.0% of the class

Shifting

Mechanical

389 of 1,706 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,706 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.7 km/h
Highest gear: 36.4 km/h

Total gear range 418%

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: 22.7–95.0 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: 2026
Lowest gear: 1229 bicycles with this information, 72.0% of the class
Highest gear: 1229 bicycles with this information, 72.0% 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
Specification	This bicycle GASGAS TRA 4	GASGAS TRA 5	GASGAS TRA 6	GASGAS TRA SE
Suspension
Suspension configuration	Hardtail	Full suspension	Full suspension	Full suspension
Front travel	120 mm	130 mm	140 mm	150 mm
Rear travel	Not informed	130 mm	130 mm	150 mm
Drivetrain
Rear sprockets	9	9	12	11
Largest sprocket	46	46	50	50
Lowest gear	22.7 in	24.0 in	20.9 in	22.0 in
Highest gear	95.0 in	100.2 in	95.0 in	100.2 in
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost
Electric bicycle systems
Battery capacity	630 Wh	500 Wh	630 Wh	630 Wh
Other specifications
Fork spring	Coil	Coil	Air	Air
Suspension	Hardtail	Full suspension	Full suspension	Full suspension
Tire width	2.3″	2.3″	2.6″	2.4″
Wheel size	27.5″	29″	27.5″	29″