Jamis Portal A1

2020 MountainTrail Manufacturer page

Last known price: $3,999

Prices shown first for United States
Travel: 130 / 130 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 12 32t / 10–51t
Gear range: 510%
Weight: 14.29 kg 31.5 lb · Reference configuration not specified
Frame: Aluminum
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

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 aluminum, 130mm travel 3VO suspension, Enduro® Max sealed bearing pivots, 1.5 - 1 1/8” tapered head tube, 12x148mm thru-axle, Internal dropper post routing, Custom Jamis upper chainguide mounts, ISCG05 lower chainguide mounts, Fox Float DPS Performance Series EVOL shock w/3-position compression, 10mm hardware, replaceable derailleur hanger Not identified

Suspension

1 part

Fork
- Fox 34

Drivetrain

6 parts

Brakes

1 part

Brakes
- Shimano Deore XT BR-M8100
BR-M8100RT-800

Wheels and tires

2 parts

Cockpit and contact points

7 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Geometry diagram unavailable

The drawing needs seat tube length, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	397	418	439	461	482
Stackmm	597	606	615	625	634
Top tube lengthmm	560	585	610	635	660
Head tube lengthmm	95	105	115	125	135
Head tube angle	67.5°	67.5°	67.5°	67.5°	67.5°
Seat tube angle	74.5°	74.5°	74.5°	74.5°	74.5°
Chainstay lengthmm	437	437	437	437	437
Wheelbasemm	1122	1148	1173	1198	1224
Front centermm	686	712	737	762	788
Bottom bracket dropmm	26	26	26	26	26
Bottom bracket heightmm	348	348	348	348	348
Standover heightmm	738	761	756	761	781
Fork rakemm	48	49	50	49	50
Trailmm	103	102	101	102	101
Stack/reach ratio	1.50	1.45	1.40	1.36	1.32

Not published by the manufacturer: Seat tube length, 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: 14.29 kg

31.5 lb

Suspension

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

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 18.2 in
Highest gear: 92.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 2.35″
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: 2020
Sample: 1,348 bicycles with this information
Coverage: 93.8% of the class

Lowest gear

18.2 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 84.6% of the class

Highest gear

92.8 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 84.6% of the class

Shifting

Mechanical

55 of 1,437 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,437 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 35.5 km/h

Total gear range 510%

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: 18.2–92.8 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: 2020
Lowest gear: 1217 bicycles with this information, 84.6% of the class
Highest gear: 1217 bicycles with this information, 84.6% 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 2020 builds
Specification	This bicycle Jamis Portal A1	Jamis Portal A2	Jamis Portal C1	Jamis Portal C2	Jamis Portal C3
Frame
Frame material	Aluminum	Aluminum	Carbon	Carbon	Carbon
Bicycle weight	14.29 kg	15.2 kg	13.95 kg	13.04 kg	13.49 kg
Suspension
Front travel	130 mm	130 mm	140 mm	130 mm	130 mm
Drivetrain
Smallest sprocket	10	11	10	10	10
Largest sprocket	51	50	50	50	51
Lowest gear	18.2 in	18.6 in	18.6 in	18.6 in	18.2 in
Highest gear	92.8 in	84.4 in	92.8 in	92.8 in	92.8 in
Other specifications
Bottom bracket standard	BSA	Not informed	Not informed	Not informed	BSA
Wheel material	Aluminum	Aluminum	Carbon	Aluminum	Aluminum

Changes since 2019
Specification	2019 Jamis Portal A1	This bicycle Jamis Portal A1
Drivetrain
Rear sprockets	11	12
Smallest sprocket	11	10
Largest sprocket	46	51
Lowest gear	19.1 in	18.2 in
Highest gear	80.0 in	92.8 in
Other specifications
Tire width	2.8″	2.35″
Wheel size	27.5″	29″