Jamis PORTAL A2 2025
2025 Mountain
Estimate price |
3,799$
Weight | 15.31 kg 
Bike details
Overview
Key information split into simple groups.
Bike summary
-
-
Frame Aluminum -
Travel Front 130mm -
Travel Rear 130mm -
Fork Fox Rhythm Float 34
-
Groupset Deore -
Suspension Full -
Drivetrain 1 × 12 -
Brakes Shimano Hydraulic Disc
Sizing
Recommended size guide.
XS
156cm - 166cm
SM
163cm - 174cm
MD
171cm - 182cm
LG
179cm - 189cm
XL
185cm - 195cm
Parts list
Components
Main components, grouped by system.
Bike components
Frame
Frame
Triple-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
Suspension 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
Drivetrain
Rear Derailleur
Shimano Deore, 12-speed
Shift Levers
Shimano Deore, 1×12-speed
Cassette
Shimano M6100, 12-speed, 10-51T
Crank
Race Face Ride, 32T
Bottom Bracket
Race Face BSA
Chain
KMC X12, 12-speed
Pedals
N/A
Wheels
Rims
Stan’s No Tubes Flow D 29? rims, Shimano MT410 15x110mm front & 12x148mm rear hubs, stainless spokes
Tires
Vittoria Mazza 29 x 2.4?, TNT tubeless
Brakes
Brakes
Shimano MT420 4-piston hydraulic disc, 180mm front & 160mm rear RT30 rotors
Cockpit
Stem
Race Face Ride, 50mm extension, 35mm clamp diameter
Handlebar
Race Face Ride, 760mm x 20mm rise, 35mm diameter
Grips
Jamis Lock-On
Headset
FSA Orbit IS Integrated, 8mm cone spacer
Seat
Saddle
WTB Volt
Seatpost
KS Rage Dropper, Southpaw remote
Fit data
Geometry
Numbers for sizing and ride feel.
| Size | XS | SM | MD | LG | XL |
|---|---|---|---|---|---|
| Stack Reach Ratio | 1.504 mm | 1.45 mm | 1.401 mm | 1.356 mm | 1.315 mm |
| Bottom Bracket Height | 341 mm | 341 mm | 341 mm | 341 mm | 341 mm |
| Front Center | 687 mm | 713 mm | 738 mm | 763 mm | 789 mm |
| Rake | 51 mm | 53 mm | 53 mm | 52 mm | 53 mm |
| Trail | 100 mm | 98 mm | 98 mm | 99 mm | 98 mm |
| Stack | 597 mm | 606 mm | 615 mm | 625 mm | 634 mm |
| Reach | 397 mm | 418 mm | 439 mm | 461 mm | 482 mm |
| Top Tube Length | 560 mm | 585 mm | 610 mm | 635 mm | 660 mm |
| Seat Tube Angle | 74.5 ° | 74.5 ° | 74.5 ° | 74.5 ° | 74.5 ° |
| Seat Tube Length | 368 mm | 394 mm | 432 mm | 483 mm | 533 mm |
| Head Tube Angle | 67.5 ° | 67.5 ° | 67.5 ° | 67.5 ° | 67.5 ° |
| Head Tube Length | 95 mm | 105 mm | 115 mm | 125 mm | 135 mm |
| Chainstay Length | 437 mm | 437 mm | 437 mm | 437 mm | 437 mm |
| Wheelbase | 1122 mm | 1148 mm | 1173 mm | 1198 mm | 1224 mm |
| Bottom Bracket Drop | 33 mm | 33 mm | 33 mm | 33 mm | 33 mm |
| Standover Height | 731 mm | 754 mm | 749 mm | 754 mm | 774 mm |
| Wheels | 29" | 29" | 29" | 29" | 29" |
| Rider Min Height | 156 cm | 163 cm | 171 cm | 179 cm | 185 cm |
| Rider Max Height | 166 cm | 174 cm | 182 cm | 189 cm | 195 cm |