Jamis Faultline A3

2026 MountainTrail Manufacturer page

Last known price: $1,999

Prices shown first for United States
Travel: 130 / 125 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 12 32t / 11–51t
Gear range: 464%
Weight: 15.42 kg 34.0 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

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

Components

16 of 17 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

Triple-butted 6061 alloy, 125mm suspension travel, 1.5 – 1 1/8” tapered head tube,12x148mm thru-axle dropout, internal dropper post routing, ISCG05 chainguide mount, Rock Shox Deluxe Select+ RT, UDH derailleur hanger Not identified

Suspension

1 part

Fork
- SR Suntour

Drivetrain

6 parts

Bottom bracket
- Shimano
Cassette
- Shimano Deore 11–51t
Chain
- KMC
Crankset
- Shimano Deore 32t
Rear derailleur
- Shimano Deore RD-M6100 12 speeds
RD-M6100
Shifters
- Shimano Deore

Brakes

1 part

Brakes
- TRP SLATE EVO

Wheels and tires

2 parts

Cockpit and contact points

7 parts

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 460mm

Stack 611mm

Wheelbase 1208mm

Head angle 66.0°

Seat angle 77.0°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	435	460	480	500
Stackmm	606	611	620	645
Top tube lengthmm	575	600	618	635
Seat tube lengthmm	394	432	483	533
Head tube lengthmm	105	110	120	130
Head tube angle	66°	66°	66°	66°
Seat tube angle	77°	77°	77°	77°
Chainstay lengthmm	445	445	445	445
Wheelbasemm	1171	1208	1227	1241
Front centermm	728	765	784	798
Bottom bracket dropmm	35	35	35	35
Bottom bracket heightmm	339	339	339	339
Standover heightmm	716	716	717	717
Fork rakemm	35	44	39	24
Trailmm	128	119	124	140
Stack/reach ratio	1.39	1.33	1.29	1.29

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: 15.42 kg

34.0 lb

Suspension

Suspension configuration: Full suspension
Front travel: 130 mm
Rear travel: 125 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 51
Lowest gear: 18.2 in
Highest gear: 84.4 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Derailleur hanger: UDH
Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire width: 2.4″
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

130 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

18.2 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

Highest gear

84.4 gear inches

This value is below 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: 7.0 km/h
Highest gear: 32.3 km/h

Total gear range 464%

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: 18.2–84.4 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

Differences across 2026 builds
Specification	This bicycle Jamis Faultline A3	Jamis Faultline A1 MPX	Jamis Faultline A3 MPX
Frame
Fork material	Aluminum	Aluminum	Not informed
Bicycle weight	15.42 kg	14.97 kg	15.42 kg
Drivetrain
Smallest sprocket	11	10	11
Largest sprocket	51	52	51
Lowest gear	18.2 in	17.9 in	18.2 in
Highest gear	84.4 in	92.8 in	84.4 in
Other specifications
Fork spring	Air	Air	Not informed