Velopedia Bicycle Archive

2021 Jamis Portal A2

Mountain bicycle from the Velopedia specification archive.

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What Velopedia knows

Model year
2021
Category
Mountain
Original MSRP
$3,799.95
Sizes
XS/14.5″, S/15.5″, M/17″, L/19″, XL/21″
Colors
Storm Grey
Weight
33.75 lbs
Geometry
5 manufacturer sizes · Geometry context
Record coverage
23 preserved details · 3 archived images · original MSRP · preserved geometry
Archive ID
900001528
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Manufacturer catalog

Published sizes and colors

5 sizes · 1 color

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

XS/14.5″S/15.5″M/17″L/19″XL/21″

Published colors

Storm Grey

Frameset

Frame ConstructionTriple-butted 6061 aluminum, 130mm travel 3VO suspension, Enduro¨ Max sealed bearing pivots, 1.5 – 1 1/8Ó 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 shock hardware, replaceable derailleur hanger
Frame MaterialAluminum
ForkFox 34 Rhythm Series Float 29″ w/ sweep adjust compression & lock-out,15x110mm axle, air spring compression, rebound adjust, tapered alloy steerer, 130mm travel, 51mm rake
Fork MaterialAluminum
Rear ShockFox Float DPS Performance Series EVOL shock w/3-position compression

Drivetrain

Component GroupShimano Deore, 12-speed
ShiftersShimano Deore, 1×12-speed
Rear DerailleurShimano Deore, 12-speed
CranksetRace Face Ride, 32T
Bottom BracketRace Face BSA
CassetteShimano M6100, 12-speed, 10-51T
ChainKMC X12, 12-speed

Brakes

BrakesShimano MT420 4-piston hydraulic disc, 180mm front & 160mm rear RT30 rotors

Cockpit & Contact Points

HeadsetFSA Orbit IS Integrated, 8mm cone spacer
HandlebarRace Face Ride, 760mm x 20mm rise, 35mm diameter
StemRace Face Ride, 50mm extension, 35mm clamp diameter
SaddleWTB Volt
SeatpostKS Rage Dropper, Southpaw remote

Wheels & Tires

WheelsStan’s No Tubes Flow D 29″ rims, Shimano MT410 15x110mm front & 12x148mm rear hubs, stainless spokes
Front TireVittoria Mazza 29 x 2.4″, TNT tubeless
Rear TireVittoria Mazza 29 x 2.4″, TNT tubeless
Wheel Size29

Size-specific frame data

Geometry

5 sizes · 8 measurements

Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.

MeasurementXS/14.5″S/15.5″M/17″L/19″XL/21″
Effective top tube560 mm585 mm610 mm635 mm660 mm
Head tube95 mm105 mm115 mm125 mm135 mm
Head-tube angle67.5°67.5°67.5°67.5°67.5°
Seat-tube angle74.5°74.5°74.5°74.5°74.5°
Chainstay / rear center437 mm437 mm437 mm437 mm437 mm
Wheelbase1122 mm1148 mm1173 mm1198 mm1224 mm
Reach397 mm418 mm439 mm461 mm482 mm
Stack597 mm606 mm615 mm625 mm634 mm

Geometry source: Jamis first-party geometry table (2021 GEO - PORTAL) ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.

Geometry tools

Analyze a published size

Choose a size

XS/14.5″ geometry

Archive context: Its reach of 397 mm sits toward the shorter end. The chainstay of 437 mm sits somewhat longer than typical. The head angle of 67.5° sits close to the middle of the group.

Compared with 16 distinct mountain geometries in the XS-equivalent size cohort from model years 2021–2023 in the Velopedia archive.
Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XS/14.5″ geometry

Parts & serviceability

Find replacement parts

3 top part searches
ChainKMC X12, 12-speedExact archived model
CassetteShimano M6100, 12-speed, 10-51TExact archived model
Front tireVittoria Mazza 29x2.4″, TNT tubelessNamed tire and published size
More qualified parts (6)
Bottom bracketRace Face BSANamed archived component — verify dimensions
SaddleWTB VoltNamed archived component — verify exact version
CranksetRace Face Ride, 32TNamed archived component — verify exact version
Rear derailleurShimano Deore, 12-speedComponent family — verify exact version
ShiftersShimano Deore, 1×12-speedComponent family — verify exact version
HandlebarRace Face Ride, 760mm x 20mm rise, 35mm diameterNamed archived component — verify dimensions

Searches use the archived manufacturer specification, not the components currently installed on a particular bicycle. Confirm the exact model, size and fit before ordering. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases. Commercial relationships do not influence Archive specifications or analysis.

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Used-bike inspection

If you’re buying this bike used

Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.

Follow the full used-bike inspection order →
  • FrameLook closely for dents and hairline cracks around welds, the head tube and bottom-bracket area. Cosmetic scratches matter less than a change in shape or a crack line.Inspect the frame and fork →
  • BrakesBoth levers should feel firm and return cleanly. Check for fluid around the levers and calipers, inspect pad thickness and contamination, and look for worn or bent rotors.Inspect the brakes →
  • SuspensionAsk when the fork and shock were last serviced. Check the stanchions for damage, look for oil at the seals, cycle both units through their travel and test the suspension pivots for play.Evaluate the suspension →
  • DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 12-speed system.Check drivetrain wear →
  • Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads. If it is set up tubeless, confirm both tires hold pressure and ask when the sealant was last refreshed.Check wheels and tires →
Bike-specific inspection checklist 23 checks based on 6 archived component groups Open checklistClose checklist
0 of 23 checked Progress stays in this browser for this bike.

This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.

Archived: 2021 Jamis Portal A2 · Mountain · Published sizes: XS/14.5″, S/15.5″, M/17″, L/19″, XL/21″

Archived: Frame: Aluminum · Fork: Fox 34 Rhythm Series Float 29″ w/ sweep adjust compression & lock-out,15x110mm axle, air spring compression, rebound adjust, tapered alloy steerer, 130mm travel, 51mm rake · Aluminum

Archived: Fork: Fox 34 Rhythm Series Float 29″ w/ sweep adjust compression & lock-out,15x110mm axle, air spring compression, rebound adjust, tapered alloy steerer, 130mm travel, 51mm rake · Rear shock: Fox Float DPS Performance Series EVOL shock w/3-position compression

Archived: Group: Shimano Deore, 12-speed · Shifters: Shimano Deore, 1×12-speed · Rear derailleur: Shimano Deore, 12-speed · Crankset: Race Face Ride, 32T · Bottom bracket: Race Face BSA · Cassette: Shimano M6100, 12-speed, 10-51T · Chain: KMC X12, 12-speed

Archived: Brakes: Shimano MT420 4-piston hydraulic disc, 180mm front & 160mm rear RT30 rotors

Archived: Wheel size: 29 · Wheels: Stan’s No Tubes Flow D 29″ rims, Shimano MT410 15x110mm front & 12x148mm rear hubs, stainless spokes · Front tire: Vittoria Mazza 29 x 2.4″, TNT tubeless · Rear tire: Vittoria Mazza 29 x 2.4″, TNT tubeless

Controls and contact points

Archived: Headset: FSA Orbit IS Integrated, 8mm cone spacer · Handlebar: Race Face Ride, 760mm x 20mm rise, 35mm diameter · Stem: Race Face Ride, 50mm extension, 35mm clamp diameter · Seatpost: KS Rage Dropper, Southpaw remote · Saddle: WTB Volt

Before and during the test ride

Follow the full used-bike inspection order →

Build relationships are limited to the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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